Merge pull request #7 from alibaba/master

merge code

analysis_options.yaml

@@ -20,6 +20,7 @@
 
 analyzer:
   strong-mode:
+    implicit-casts: false
     implicit-dynamic: false
   errors:
     # treat missing required parameters as a warning (not a hint)
@@ -38,9 +39,7 @@ analyzer:
     # see https://github.com/dart-lang/sdk/issues/28463
     - "lib/i18n/messages_*.dart"
     - "lib/src/http/**"
-    - "example/**"
-    - "example_swift/**"
-    - "test/**"
+
 linter:
   rules:
     # these rules are documented on and in the same order as
@@ -60,6 +59,7 @@ linter:
     - avoid_classes_with_only_static_members
     # - avoid_double_and_int_checks # only useful when targeting JS runtime
     - avoid_empty_else
+    - avoid_equals_and_hash_code_on_mutable_classes
     - avoid_field_initializers_in_const_classes
     - avoid_function_literals_in_foreach_calls
     # - avoid_implementing_value_types # not yet tested
@@ -67,7 +67,9 @@ linter:
     # - avoid_js_rounded_ints # only useful when targeting JS runtime
     - avoid_null_checks_in_equality_operators
     # - avoid_positional_boolean_parameters # not yet tested
+    # - avoid_print # not yet tested
     # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
+    # - avoid_redundant_argument_values # not yet tested
     - avoid_relative_lib_imports
     - avoid_renaming_method_parameters
     - avoid_return_types_on_setters
@@ -77,13 +79,16 @@ linter:
     # - avoid_returning_this # there are plenty of valid reasons to return this
     # - avoid_setters_without_getters # not yet tested
     # - avoid_shadowing_type_parameters # not yet tested
-    # - avoid_single_cascade_in_expression_statements # not yet tested
+    - avoid_single_cascade_in_expression_statements
     - avoid_slow_async_io
     - avoid_types_as_parameter_names
     # - avoid_types_on_closure_parameters # conflicts with always_specify_types
+    # - avoid_unnecessary_containers # not yet tested
     - avoid_unused_constructor_parameters
     - avoid_void_async
+    # - avoid_web_libraries_in_flutter # not yet tested
     - await_only_futures
+    - camel_case_extensions
     - camel_case_types
     - cancel_subscriptions
     # - cascade_invocations # not yet tested
@@ -109,8 +114,11 @@ linter:
     # - lines_longer_than_80_chars # not yet tested
     - list_remove_unrelated_type
     # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/sdk/issues/34181
+    # - missing_whitespace_between_adjacent_strings # not yet tested
     - no_adjacent_strings_in_list
     - no_duplicate_case_values
+    # - no_logic_in_create_state # not yet tested
+    # - no_runtimeType_toString # not yet tested
     - non_constant_identifier_names
     # - null_closures  # not yet tested
     # - omit_local_variable_types # opposite of always_specify_types
@@ -136,9 +144,9 @@ linter:
     - prefer_equal_for_default_values
     # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
     - prefer_final_fields
-    # - prefer_final_in_for_each # not yet tested
+    - prefer_final_in_for_each
     - prefer_final_locals
-    # - prefer_for_elements_to_map_fromIterable # not yet tested
+    - prefer_for_elements_to_map_fromIterable
     - prefer_foreach
     # - prefer_function_declarations_over_variables # not yet tested
     - prefer_generic_function_type_aliases
@@ -150,9 +158,11 @@ linter:
     # - prefer_interpolation_to_compose_strings # not yet tested
     - prefer_is_empty
     - prefer_is_not_empty
+    - prefer_is_not_operator
     - prefer_iterable_whereType
     # - prefer_mixin # https://github.com/dart-lang/language/issues/32
     # - prefer_null_aware_operators # disable until NNBD, see https://github.com/flutter/flutter/pull/32711#issuecomment-492930932
+    # - prefer_relative_imports # not yet tested
     - prefer_single_quotes
     - prefer_spread_collections
     - prefer_typing_uninitialized_variables
@@ -173,6 +183,7 @@ linter:
     # - unnecessary_await_in_return # not yet tested
     - unnecessary_brace_in_string_interps
     - unnecessary_const
+    # - unnecessary_final # conflicts with prefer_final_locals
     - unnecessary_getters_setters
     # - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
     - unnecessary_new
@@ -181,14 +192,16 @@ linter:
     - unnecessary_overrides
     - unnecessary_parenthesis
     - unnecessary_statements
+    # - unnecessary_string_interpolations
     - unnecessary_this
     - unrelated_type_equality_checks
     # - unsafe_html # not yet tested
     - use_full_hex_values_for_flutter_colors
     # - use_function_type_syntax_for_parameters # not yet tested
+    # - use_key_in_widget_constructors # not yet tested
     - use_rethrow_when_possible
     # - use_setters_to_change_properties # not yet tested
     # - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
     # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
     - valid_regexps
-    # - void_checks # not yet tested
+    - void_checks
\ No newline at end of file

android/build.gradle

@@ -22,7 +22,7 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 28
+    compileSdkVersion 29
     buildToolsVersion '28.0.3'
     defaultConfig {
         minSdkVersion 16

android/src/main/java/com/idlefish/flutterboost/XPlatformPlugin.java

+package com.idlefish.flutterboost;
+
+import android.app.Activity;
+import android.app.ActivityManager;
+import android.content.ClipData;
+import android.content.ClipboardManager;
+import android.content.Context;
+import android.graphics.Rect;
+import android.os.Build;
+
+
+import android.view.HapticFeedbackConstants;
+import android.view.SoundEffectConstants;
+import android.view.View;
+import android.view.Window;
+
+import java.util.ArrayList;
+import java.util.List;
+
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import io.flutter.embedding.engine.systemchannels.PlatformChannel;
+
+public class XPlatformPlugin {
+
+
+    public static final int DEFAULT_SYSTEM_UI = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
+
+    private  Activity activity;
+    private  PlatformChannel platformChannel;
+    private PlatformChannel.SystemChromeStyle currentTheme;
+    private int mEnabledOverlays;
+
+    private  PlatformChannel.PlatformMessageHandler mPlatformMessageHandler = new PlatformChannel.PlatformMessageHandler() {
+        @Override
+        public void playSystemSound(@NonNull PlatformChannel.SoundType soundType) {
+            XPlatformPlugin.this.playSystemSound(soundType);
+        }
+
+        @Override
+        public void vibrateHapticFeedback(@NonNull PlatformChannel.HapticFeedbackType feedbackType) {
+            XPlatformPlugin.this.vibrateHapticFeedback(feedbackType);
+        }
+
+        @Override
+        public void setPreferredOrientations(int androidOrientation) {
+            setSystemChromePreferredOrientations(androidOrientation);
+        }
+
+        @Override
+        public void setApplicationSwitcherDescription(@NonNull PlatformChannel.AppSwitcherDescription description) {
+            setSystemChromeApplicationSwitcherDescription(description);
+        }
+
+        @Override
+        public void showSystemOverlays(@NonNull List<PlatformChannel.SystemUiOverlay> overlays) {
+            setSystemChromeEnabledSystemUIOverlays(overlays);
+        }
+
+        @Override
+        public void restoreSystemUiOverlays() {
+            restoreSystemChromeSystemUIOverlays();
+        }
+
+        @Override
+        public void setSystemUiOverlayStyle(@NonNull PlatformChannel.SystemChromeStyle systemUiOverlayStyle) {
+            setSystemChromeSystemUIOverlayStyle(systemUiOverlayStyle);
+        }
+
+        @Override
+        public void popSystemNavigator() {
+            XPlatformPlugin.this.popSystemNavigator();
+        }
+
+        @Override
+        public CharSequence getClipboardData(@Nullable PlatformChannel.ClipboardContentFormat format) {
+            return XPlatformPlugin.this.getClipboardData(format);
+        }
+
+        @Override
+        public void setClipboardData(@NonNull String text) {
+            XPlatformPlugin.this.setClipboardData(text);
+        }
+
+        @Override
+        public List<Rect> getSystemGestureExclusionRects() {
+            return XPlatformPlugin.this.getSystemGestureExclusionRects();
+        }
+
+        @Override
+        public void setSystemGestureExclusionRects(@NonNull ArrayList<Rect> rects) {
+            XPlatformPlugin.this.setSystemGestureExclusionRects(rects);
+        }
+    };
+
+    public XPlatformPlugin( PlatformChannel platformChannel) {
+
+        this.platformChannel = platformChannel;
+
+        mEnabledOverlays = DEFAULT_SYSTEM_UI;
+    }
+
+    public void attachToActivity(Activity activity ){
+        this.activity = activity;
+        this.platformChannel.setPlatformMessageHandler(mPlatformMessageHandler);
+
+    }
+    /**
+     * Releases all resources held by this {@code PlatformPlugin}.
+     * <p>
+     * Do not invoke any methods on a {@code PlatformPlugin} after invoking this method.
+     */
+    public void detachActivity() {
+       this.activity=null;
+       this.mPlatformMessageHandler=null;
+    }
+
+    private void playSystemSound(PlatformChannel.SoundType soundType) {
+        if (soundType == PlatformChannel.SoundType.CLICK) {
+            View view = activity.getWindow().getDecorView();
+            view.playSoundEffect(SoundEffectConstants.CLICK);
+        }
+    }
+
+    private void vibrateHapticFeedback(PlatformChannel.HapticFeedbackType feedbackType) {
+        View view = activity.getWindow().getDecorView();
+        switch (feedbackType) {
+            case STANDARD:
+                view.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+                break;
+            case LIGHT_IMPACT:
+                view.performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
+                break;
+            case MEDIUM_IMPACT:
+                view.performHapticFeedback(HapticFeedbackConstants.KEYBOARD_TAP);
+                break;
+            case HEAVY_IMPACT:
+                // HapticFeedbackConstants.CONTEXT_CLICK from API level 23.
+                view.performHapticFeedback(6);
+                break;
+            case SELECTION_CLICK:
+                view.performHapticFeedback(HapticFeedbackConstants.CLOCK_TICK);
+                break;
+        }
+    }
+
+    private void setSystemChromePreferredOrientations(int androidOrientation) {
+        activity.setRequestedOrientation(androidOrientation);
+    }
+
+    @SuppressWarnings("deprecation")
+    private void setSystemChromeApplicationSwitcherDescription(PlatformChannel.AppSwitcherDescription description) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+            return;
+        }
+
+        // Linter refuses to believe we're only executing this code in API 28 unless we use distinct if blocks and
+        // hardcode the API 28 constant.
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P && Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
+            activity.setTaskDescription(new ActivityManager.TaskDescription(description.label, /*icon=*/ null, description.color));
+        }
+        if (Build.VERSION.SDK_INT >= 28) {
+            ActivityManager.TaskDescription taskDescription = new ActivityManager.TaskDescription(description.label, 0, description.color);
+            activity.setTaskDescription(taskDescription);
+        }
+    }
+
+    private void setSystemChromeEnabledSystemUIOverlays(List<PlatformChannel.SystemUiOverlay> overlaysToShow) {
+        // Start by assuming we want to hide all system overlays (like an immersive game).
+        int enabledOverlays = DEFAULT_SYSTEM_UI
+                | View.SYSTEM_UI_FLAG_FULLSCREEN
+                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
+
+        if (overlaysToShow.size() == 0) {
+            enabledOverlays |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
+        }
+
+        // Re-add any desired system overlays.
+        for (int i = 0; i < overlaysToShow.size(); ++i) {
+            PlatformChannel.SystemUiOverlay overlayToShow = overlaysToShow.get(i);
+            switch (overlayToShow) {
+                case TOP_OVERLAYS:
+                    enabledOverlays &= ~View.SYSTEM_UI_FLAG_FULLSCREEN;
+                    break;
+                case BOTTOM_OVERLAYS:
+                    enabledOverlays &= ~View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
+                    enabledOverlays &= ~View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
+                    break;
+            }
+        }
+
+        mEnabledOverlays = enabledOverlays;
+        updateSystemUiOverlays();
+    }
+
+    /**
+     * Refreshes Android's window system UI (AKA system chrome) to match Flutter's desired
+     * {@link PlatformChannel.SystemChromeStyle}.
+     * <p>
+     * Updating the system UI Overlays is accomplished by altering the decor view of the
+     * {@link Window} associated with the {@link Activity} that was provided to this
+     * {@code PlatformPlugin}.
+     */
+    public void updateSystemUiOverlays(){
+        activity.getWindow().getDecorView().setSystemUiVisibility(mEnabledOverlays);
+        if (currentTheme != null) {
+            setSystemChromeSystemUIOverlayStyle(currentTheme);
+        }
+    }
+
+    private void restoreSystemChromeSystemUIOverlays() {
+        updateSystemUiOverlays();
+    }
+
+    private void setSystemChromeSystemUIOverlayStyle(PlatformChannel.SystemChromeStyle systemChromeStyle) {
+        Window window = activity.getWindow();
+        View view = window.getDecorView();
+        int flags = view.getSystemUiVisibility();
+        // You can change the navigation bar color (including translucent colors)
+        // in Android, but you can't change the color of the navigation buttons until Android O.
+        // LIGHT vs DARK effectively isn't supported until then.
+        // Build.VERSION_CODES.O
+        if (Build.VERSION.SDK_INT >= 26) {
+            if (systemChromeStyle.systemNavigationBarIconBrightness != null) {
+                switch (systemChromeStyle.systemNavigationBarIconBrightness) {
+                    case DARK:
+                        //View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR
+                        flags |= 0x10;
+                        break;
+                    case LIGHT:
+                        flags &= ~0x10;
+                        break;
+                }
+            }
+            if (systemChromeStyle.systemNavigationBarColor != null) {
+                window.setNavigationBarColor(systemChromeStyle.systemNavigationBarColor);
+            }
+        }
+        // Build.VERSION_CODES.M
+        if (Build.VERSION.SDK_INT >= 23) {
+            if (systemChromeStyle.statusBarIconBrightness != null) {
+                switch (systemChromeStyle.statusBarIconBrightness) {
+                    case DARK:
+                        // View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
+                        flags |= 0x2000;
+                        break;
+                    case LIGHT:
+                        flags &= ~0x2000;
+                        break;
+                }
+            }
+            if (systemChromeStyle.statusBarColor != null) {
+                window.setStatusBarColor(systemChromeStyle.statusBarColor);
+            }
+        }
+        if (systemChromeStyle.systemNavigationBarDividerColor != null) {
+            // Not available until Android P.
+            // window.setNavigationBarDividerColor(systemNavigationBarDividerColor);
+        }
+        view.setSystemUiVisibility(flags);
+        currentTheme = systemChromeStyle;
+    }
+
+    private void popSystemNavigator() {
+        activity.finish();
+    }
+
+    private CharSequence getClipboardData(PlatformChannel.ClipboardContentFormat format) {
+        ClipboardManager clipboard = (ClipboardManager) activity.getSystemService(Context.CLIPBOARD_SERVICE);
+        ClipData clip = clipboard.getPrimaryClip();
+        if (clip == null)
+            return null;
+
+        if (format == null || format == PlatformChannel.ClipboardContentFormat.PLAIN_TEXT) {
+            return clip.getItemAt(0).coerceToText(activity);
+        }
+
+        return null;
+    }
+
+    private void setClipboardData(String text) {
+        ClipboardManager clipboard = (ClipboardManager) activity.getSystemService(Context.CLIPBOARD_SERVICE);
+        ClipData clip = ClipData.newPlainText("text label?", text);
+        clipboard.setPrimaryClip(clip);
+    }
+
+
+    private List<Rect> getSystemGestureExclusionRects() {
+        if (Build.VERSION.SDK_INT >= 29) {
+            Window window = activity.getWindow();
+            View view = window.getDecorView();
+            return view.getSystemGestureExclusionRects();
+        }
+
+        return null;
+    }
+
+    private void setSystemGestureExclusionRects(ArrayList<Rect> rects) {
+        if (Build.VERSION.SDK_INT < 29) {
+            return;
+        }
+
+        Window window = activity.getWindow();
+        View view = window.getDecorView();
+        view.setSystemGestureExclusionRects(rects);
+    }
+
+}

android/src/main/java/com/idlefish/flutterboost/containers/BoostFlutterActivity.java

@@ -21,6 +21,7 @@ import android.view.*;
 import android.widget.*;
 import com.idlefish.flutterboost.FlutterBoost;
 import com.idlefish.flutterboost.XFlutterView;
+import com.idlefish.flutterboost.XPlatformPlugin;
 import io.flutter.Log;
 import io.flutter.embedding.android.DrawableSplashScreen;
 import io.flutter.embedding.android.FlutterView;
@@ -439,12 +440,8 @@ public class BoostFlutterActivity extends Activity
 
     @Nullable
     @Override
-    public PlatformPlugin providePlatformPlugin(@Nullable Activity activity, @NonNull FlutterEngine flutterEngine) {
-        if (activity != null) {
-            return new PlatformPlugin(getActivity(), flutterEngine.getPlatformChannel());
-        } else {
-            return null;
-        }
+    public XPlatformPlugin providePlatformPlugin( @NonNull FlutterEngine flutterEngine) {
+        return new XPlatformPlugin( flutterEngine.getPlatformChannel());
     }
 
     /**

android/src/main/java/com/idlefish/flutterboost/containers/FlutterActivityAndFragmentDelegate.java

@@ -23,6 +23,7 @@ import java.util.Map;
 import com.idlefish.flutterboost.FlutterBoost;
 import com.idlefish.flutterboost.Utils;
 import com.idlefish.flutterboost.XFlutterView;
+import com.idlefish.flutterboost.XPlatformPlugin;
 import com.idlefish.flutterboost.interfaces.IFlutterViewContainer;
 import com.idlefish.flutterboost.interfaces.IOperateSyncer;
 import io.flutter.Log;
@@ -30,6 +31,7 @@ import io.flutter.app.FlutterActivity;
 import io.flutter.embedding.android.*;
 import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.embedding.engine.FlutterShellArgs;
+import io.flutter.embedding.engine.plugins.activity.ActivityControlSurface;
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
 import io.flutter.plugin.platform.PlatformPlugin;
 
@@ -39,7 +41,7 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
 
 
     private static final String TAG = "FlutterActivityAndFragmentDelegate";
-
+    private  static int ACTIVITY_CONTROL_SURFACE_ATTACH_TO_ACTVITY_HASH_CODE=0;
     @NonNull
     private Host host;
     @Nullable
@@ -49,7 +51,7 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
     @Nullable
     private XFlutterView flutterView;
     @Nullable
-    private PlatformPlugin platformPlugin;
+    private XPlatformPlugin platformPlugin;
 
     private boolean isFlutterEngineFromHost;
 
@@ -95,7 +97,7 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
         // TODO(mattcarroll): the PlatformPlugin needs to be reimagined because it implicitly takes
         //                    control of the entire window. This is unacceptable for non-fullscreen
         //                    use-cases.
-        platformPlugin = host.providePlatformPlugin(host.getActivity(), flutterEngine);
+        platformPlugin = host.providePlatformPlugin(flutterEngine);
 
 
         host.configureFlutterEngine(flutterEngine);
@@ -129,13 +131,6 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
         Log.v(TAG, "Creating FlutterView.");
 
 
-        flutterEngine.getActivityControlSurface().attachToActivity(
-                host.getActivity(),
-                host.getLifecycle()
-        );
-
-
-
         mSyncer = FlutterBoost.instance().containerManager().generateSyncer(this);
 
         ensureAlive();
@@ -176,13 +171,19 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
         Log.v(TAG, "onResume()");
         ensureAlive();
         flutterEngine.getLifecycleChannel().appIsResumed();
-
-        flutterEngine.getActivityControlSurface().attachToActivity(
-                host.getActivity(),
-                host.getLifecycle()
-        );
+        if(ACTIVITY_CONTROL_SURFACE_ATTACH_TO_ACTVITY_HASH_CODE==0||
+                ACTIVITY_CONTROL_SURFACE_ATTACH_TO_ACTVITY_HASH_CODE!=this.host.getActivity().hashCode()){
+            flutterEngine.getActivityControlSurface().detachFromActivityForConfigChanges();
+            flutterEngine.getActivityControlSurface().attachToActivity(
+                    host.getActivity(),
+                    host.getLifecycle()
+            );
+            ACTIVITY_CONTROL_SURFACE_ATTACH_TO_ACTVITY_HASH_CODE=this.host.getActivity().hashCode();
+        }
 
 
+        if(platformPlugin!=null)
+            platformPlugin.attachToActivity( host.getActivity());
 
 
     }
@@ -191,7 +192,6 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
     public void onPostResume() {
         Log.v(TAG, "onPostResume()");
         ensureAlive();
-//        Utils.setStatusBarLightMode(host.getActivity(), true);
 
     }
 
@@ -230,10 +230,15 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
         // Null out the platformPlugin to avoid a possible retain cycle between the plugin, this Fragment,
         // and this Fragment's Activity.
         if (platformPlugin != null) {
-//            platformPlugin.destroy();
+            platformPlugin.detachActivity();
             platformPlugin = null;
         }
 
+        if(ACTIVITY_CONTROL_SURFACE_ATTACH_TO_ACTVITY_HASH_CODE!=0||
+                ACTIVITY_CONTROL_SURFACE_ATTACH_TO_ACTVITY_HASH_CODE==this.host.getActivity().hashCode()){
+            flutterEngine.getActivityControlSurface().detachFromActivityForConfigChanges();
+        }
+
         Utils.fixInputMethodManagerLeak(host.getActivity());
 
     }
@@ -461,7 +466,7 @@ public class FlutterActivityAndFragmentDelegate implements IFlutterViewContainer
          * Flutter experience should control system chrome.
          */
         @Nullable
-        PlatformPlugin providePlatformPlugin(@Nullable Activity activity, @NonNull FlutterEngine flutterEngine);
+        XPlatformPlugin providePlatformPlugin( @NonNull FlutterEngine flutterEngine);
 
         /**
          * Hook for the host to configure the {@link FlutterEngine} as desired.

android/src/main/java/com/idlefish/flutterboost/containers/FlutterFragment.java

@@ -16,6 +16,7 @@ import androidx.fragment.app.FragmentActivity;
 import com.idlefish.flutterboost.FlutterBoost;
 import com.idlefish.flutterboost.Utils;
 import com.idlefish.flutterboost.XFlutterView;
+import com.idlefish.flutterboost.XPlatformPlugin;
 import io.flutter.embedding.android.*;
 import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.embedding.engine.FlutterShellArgs;
@@ -467,12 +468,9 @@ public class FlutterFragment extends Fragment implements FlutterActivityAndFragm
 
     @Nullable
     @Override
-    public PlatformPlugin providePlatformPlugin(@Nullable Activity activity, @NonNull FlutterEngine flutterEngine) {
-        if (activity != null) {
-            return new PlatformPlugin(getActivity(), flutterEngine.getPlatformChannel());
-        } else {
-            return null;
-        }
+    public XPlatformPlugin providePlatformPlugin( @NonNull FlutterEngine flutterEngine) {
+        return new XPlatformPlugin(flutterEngine.getPlatformChannel());
+
     }
 
     /**

example/lib/main.dart

@@ -16,20 +16,26 @@ class _MyAppState extends State<MyApp> {
   void initState() {
     super.initState();
 
-    FlutterBoost.singleton.registerPageBuilders({
-      'embeded': (pageName, params, _)=>EmbededFirstRouteWidget(),
-      'first': (pageName, params, _) => FirstRouteWidget(),
-      'firstFirst': (pageName, params, _) => FirstFirstRouteWidget(),
-      'second': (pageName, params, _) => SecondRouteWidget(),
-      'secondStateful': (pageName, params, _) => SecondStatefulRouteWidget(),
-      'tab': (pageName, params, _) => TabRouteWidget(),
-      'platformView': (pageName, params, _) => PlatformRouteWidget(),
-      'flutterFragment': (pageName, params, _) => FragmentRouteWidget(params),
+    FlutterBoost.singleton.registerPageBuilders(<String, PageBuilder>{
+      'embeded': (String pageName, Map<String, dynamic> params, String _) =>
+          EmbeddedFirstRouteWidget(),
+      'first': (String pageName, Map<String, dynamic> params, String _) => FirstRouteWidget(),
+      'firstFirst': (String pageName, Map<String, dynamic> params, String _) =>
+          FirstFirstRouteWidget(),
+      'second': (String pageName, Map<String, dynamic> params, String _) => SecondRouteWidget(),
+      'secondStateful': (String pageName, Map<String, dynamic> params, String _) =>
+          SecondStatefulRouteWidget(),
+      'tab': (String pageName, Map<String, dynamic> params, String _) => TabRouteWidget(),
+      'platformView': (String pageName, Map<String, dynamic> params, String _) =>
+          PlatformRouteWidget(),
+      'flutterFragment': (String pageName, Map<String, dynamic> params, String _) =>
+          FragmentRouteWidget(params),
+
       ///可以在native层通过 getContainerParams 来传递参数
-      'flutterPage': (pageName, params, _) {
-        print("flutterPage params:$params");
+      'flutterPage': (String pageName, Map<String, dynamic> params, String _) {
+        print('flutterPage params:$params');
 
-        return FlutterRouteWidget(params:params);
+        return FlutterRouteWidget(params: params);
       },
     });
     FlutterBoost.singleton.addBoostNavigatorObserver(TestBoostNavigatorObserver());
@@ -40,31 +46,36 @@ class _MyAppState extends State<MyApp> {
     return MaterialApp(
         title: 'Flutter Boost example',
         builder: FlutterBoost.init(postPush: _onRoutePushed),
-        home: Container(
-            color:Colors.white
-        ));
+        home: Container(color: Colors.white));
   }
 
   void _onRoutePushed(
-      String pageName, String uniqueId, Map params, Route route, Future _) {
-  }
+    String pageName,
+    String uniqueId,
+    Map<String, dynamic> params,
+    Route<dynamic> route,
+    Future<dynamic> _,
+  ) {}
 }
-class TestBoostNavigatorObserver extends NavigatorObserver{
-  void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
 
-    print("flutterboost#didPush");
+class TestBoostNavigatorObserver extends NavigatorObserver {
+  @override
+  void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
+    print('flutterboost#didPush');
   }
 
+  @override
   void didPop(Route<dynamic> route, Route<dynamic> previousRoute) {
-    print("flutterboost#didPop");
+    print('flutterboost#didPop');
   }
 
+  @override
   void didRemove(Route<dynamic> route, Route<dynamic> previousRoute) {
-    print("flutterboost#didRemove");
+    print('flutterboost#didRemove');
   }
 
+  @override
   void didReplace({Route<dynamic> newRoute, Route<dynamic> oldRoute}) {
-    print("flutterboost#didReplace");
+    print('flutterboost#didReplace');
   }
 }
-

example/lib/platform_view.dart

@@ -3,7 +3,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
-typedef void TextViewCreatedCallback(TextViewController controller);
+typedef TextViewCreatedCallback = void Function(TextViewController controller);
 
 class TextView extends StatefulWidget {
   const TextView({
@@ -34,13 +34,13 @@ class _TextViewState extends State<TextView> {
     if (widget.onTextViewCreated == null) {
       return;
     }
-    widget.onTextViewCreated(new TextViewController._(id));
+    widget.onTextViewCreated(TextViewController._(id));
   }
 }
 
 class TextViewController {
   TextViewController._(int id)
-      : _channel = new MethodChannel('plugins.felix.angelov/textview_$id');
+      : _channel = MethodChannel('plugins.felix.angelov/textview_$id');
 
   final MethodChannel _channel;
 
@@ -48,4 +48,4 @@ class TextViewController {
     assert(text != null);
     return _channel.invokeMethod('setText', text);
   }
-}
+}
\ No newline at end of file

example/lib/simple_page_widgets.dart

@@ -5,11 +5,10 @@ import 'package:flutter_boost_example/platform_view.dart';
 
 class FirstRouteWidget extends StatefulWidget {
   @override
-  State<StatefulWidget> createState() {
-    return new _FirstRouteWidgetState();
-  }
+  State<StatefulWidget> createState() => _FirstRouteWidgetState();
 }
-class _FirstRouteWidgetState extends State<FirstRouteWidget>{
+
+class _FirstRouteWidgetState extends State<FirstRouteWidget> {
   _FirstRouteWidgetState();
 
   @override
@@ -45,80 +44,86 @@ class _FirstRouteWidgetState extends State<FirstRouteWidget>{
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text('First Route'),
-      ),
+      appBar: AppBar(title: const Text('First Route')),
       body: Center(
-        child:
-        Column(
+        child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
-          children: 
-          <Widget>[
+          children: <Widget>[
             RaisedButton(
-                child: Text('Open native page'),
-                onPressed: () {
-                  print("open natve page!");
-                  FlutterBoost.singleton.open("native").then((Map value) {
-                    print(
-                        "call me when page is finished. did recieve native route result $value");
-                  });
-                },
-              ),
-              RaisedButton(
-                child: Text('Open FF route'),
-                onPressed: () {
-                  print("open FF page!");
-                  FlutterBoost.singleton.open("firstFirst").then((Map value) {
-                    print(
-                        "call me when page is finished. did recieve FF route result $value");
-                  });
-                },
-              ),
-              RaisedButton(
-                child: Text('Open second route1'),
-                onPressed: () {
-                  print("open second page!");
-                  FlutterBoost.singleton.open("second").then((Map value) {
-                    print(
-                        "call me when page is finished. did recieve second route result $value");
-                  });
-                },
-              ),
-
-              RaisedButton(
-                  child: Text('Present second stateful route'),
-                  onPressed: () {
-                    print("Present second stateful page!");
-                    FlutterBoost.singleton.open("secondStateful",urlParams:<dynamic,dynamic>{"present":true}).then((Map value) {
-                      print(
-                          "call me when page is finished. did recieve second stateful route result $value");
-                    });
-                  },
-                ),
-                RaisedButton(
-                  child: Text('Present second route'),
-                  onPressed: () {
-                    print("Present second page!");
-                    FlutterBoost.singleton.open("second",urlParams:<dynamic,dynamic>{"present":true}).then((Map value) {
-                      print(
-                          "call me when page is finished. did recieve second route result $value");
-                    });
-                  },
-                ),
-            ],
+              child: const Text('Open native page'),
+              onPressed: () {
+                print('open natve page!');
+                FlutterBoost.singleton
+                    .open('native')
+                    .then((Map<String, dynamic> value) {
+                  print(
+                      'call me when page is finished. did recieve native route result $value');
+                });
+              },
+            ),
+            RaisedButton(
+              child: const Text('Open FF route'),
+              onPressed: () {
+                print('open FF page!');
+                FlutterBoost.singleton
+                    .open('firstFirst')
+                    .then((Map<String, dynamic> value) {
+                  print(
+                      'call me when page is finished. did recieve FF route result $value');
+                });
+              },
+            ),
+            RaisedButton(
+              child: const Text('Open second route1'),
+              onPressed: () {
+                print('open second page!');
+                FlutterBoost.singleton
+                    .open('second')
+                    .then((Map<String, dynamic> value) {
+                  print(
+                      'call me when page is finished. did recieve second route result $value');
+                });
+              },
+            ),
+            RaisedButton(
+              child: const Text('Present second stateful route'),
+              onPressed: () {
+                print('Present second stateful page!');
+                FlutterBoost.singleton.open('secondStateful',
+                    urlParams: <String, dynamic>{
+                      'present': true
+                    }).then((Map<String, dynamic> value) {
+                  print(
+                      'call me when page is finished. did recieve second stateful route result $value');
+                });
+              },
+            ),
+            RaisedButton(
+              child: const Text('Present second route'),
+              onPressed: () {
+                print('Present second page!');
+                FlutterBoost.singleton.open('second',
+                    urlParams: <String, dynamic>{
+                      'present': true
+                    }).then((Map<String, dynamic> value) {
+                  print(
+                      'call me when page is finished. did recieve second route result $value');
+                });
+              },
+            ),
+          ],
         ),
       ),
     );
   }
 }
+
 class FirstFirstRouteWidget extends StatefulWidget {
   @override
-  State<StatefulWidget> createState() {
-    return new _FirstFirstRouteWidgetState();
-  }
+  State<StatefulWidget> createState() => _FirstFirstRouteWidgetState();
 }
 
-class _FirstFirstRouteWidgetState extends State<FirstFirstRouteWidget>{
+class _FirstFirstRouteWidgetState extends State<FirstFirstRouteWidget> {
   _FirstFirstRouteWidgetState();
 
   @override
@@ -154,20 +159,18 @@ class _FirstFirstRouteWidgetState extends State<FirstFirstRouteWidget>{
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text('First Route'),
-      ),
+      appBar: AppBar(title: const Text('First Route')),
       body: Center(
         child: RaisedButton(
-          child: Text('Open first route'),
+          child: const Text('Open first route'),
           onPressed: () {
-
-            print("open first page again!");
-            FlutterBoost.singleton.open("first").then((Map value){
-              print("did recieve first route result");
-              print("did recieve first route result $value");
+            print('open first page again!');
+            FlutterBoost.singleton
+                .open('first')
+                .then((Map<String, dynamic> value) {
+              print('did recieve first route result');
+              print('did recieve first route result $value');
             });
-
           },
         ),
       ),
@@ -175,34 +178,33 @@ class _FirstFirstRouteWidgetState extends State<FirstFirstRouteWidget>{
   }
 }
 
-class EmbededFirstRouteWidget extends StatefulWidget {
+class EmbeddedFirstRouteWidget extends StatefulWidget {
   @override
-  State<StatefulWidget> createState() {
-    // TODO: implement createState
-    return _EmbededFirstRouteWidgetState();
-  }
-
+  State<StatefulWidget> createState() => _EmbeddedFirstRouteWidgetState();
 }
 
-class _EmbededFirstRouteWidgetState extends State<EmbededFirstRouteWidget> {
+class _EmbeddedFirstRouteWidgetState extends State<EmbeddedFirstRouteWidget> {
   @override
   Widget build(BuildContext context) {
     print('_EmbededFirstRouteWidgetState build called!');
     return Scaffold(
       body: Center(
         child: RaisedButton(
-          child: Text('Open second route2'),
+          child: const Text('Open second route2'),
           onPressed: () {
-            print("open second page!");
-            FlutterBoost.singleton.open("second").then((Map value) {
+            print('open second page!');
+            FlutterBoost.singleton
+                .open('second')
+                .then((Map<String, dynamic> value) {
               print(
-                  "call me when page is finished. did recieve second route result $value");
+                  'call me when page is finished. did recieve second route result $value');
             });
           },
         ),
       ),
     );
   }
+
   @override
   void dispose() {
     print('[XDEBUG]:_EmbededFirstRouteWidgetState disposing~');
@@ -212,29 +214,24 @@ class _EmbededFirstRouteWidgetState extends State<EmbededFirstRouteWidget> {
 
 class SecondStatefulRouteWidget extends StatefulWidget {
   @override
-  State<StatefulWidget> createState() {
-    // TODO: implement createState
-    return _SecondStatefulRouteWidgetState();
-  }
+  State<StatefulWidget> createState() => _SecondStatefulRouteWidgetState();
 }
-class _SecondStatefulRouteWidgetState extends State<SecondStatefulRouteWidget>{
+
+class _SecondStatefulRouteWidgetState extends State<SecondStatefulRouteWidget> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text("SecondStateful Route"),
-      ),
+      appBar: AppBar(title: const Text('SecondStateful Route')),
       body: Center(
         child: RaisedButton(
           onPressed: () {
             // Navigate back to first route when tapped.
-
-            BoostContainerSettings settings =
+            final BoostContainerSettings settings =
                 BoostContainer.of(context).settings;
             FlutterBoost.singleton.close(settings.uniqueId,
-                result: <dynamic,dynamic>{"result": "data from second"});
+                result: <String, dynamic>{'result': 'data from second'});
           },
-          child: Text('Go back with result!'),
+          child: const Text('Go back with result!'),
         ),
       ),
     );
@@ -251,20 +248,19 @@ class SecondRouteWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text("Second Route"),
-      ),
+      appBar: AppBar(title: const Text('Second Route')),
       body: Center(
         child: RaisedButton(
           onPressed: () {
             // Navigate back to first route when tapped.
-
-            BoostContainerSettings settings =
+            final BoostContainerSettings settings =
                 BoostContainer.of(context).settings;
-            FlutterBoost.singleton.close(settings.uniqueId,
-                result: <dynamic,dynamic>{"result": "data from second"});
+            FlutterBoost.singleton.close(
+              settings.uniqueId,
+              result: <String, dynamic>{'result': 'data from second'},
+            );
           },
-          child: Text('Go back with result!'),
+          child: const Text('Go back with result!'),
         ),
       ),
     );
@@ -275,15 +271,13 @@ class TabRouteWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text("Tab Route"),
-      ),
+      appBar: AppBar(title: const Text('Tab Route')),
       body: Center(
         child: RaisedButton(
           onPressed: () {
-            FlutterBoost.singleton.open("second");
+            FlutterBoost.singleton.open('second');
           },
-          child: Text('Open second route3'),
+          child: const Text('Open second route3'),
         ),
       ),
     );
@@ -294,17 +288,17 @@ class PlatformRouteWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title:Text("Platform Route"),
-      ),
+      appBar: AppBar(title: const Text('Platform Route')),
       body: Center(
         child: RaisedButton(
-          child: TextView(),
+          child: const TextView(),
           onPressed: () {
-            print("open second page!");
-            FlutterBoost.singleton.open("second").then((Map value) {
+            print('open second page!');
+            FlutterBoost.singleton
+                .open('second')
+                .then((Map<String, dynamic> value) {
               print(
-                  "call me when page is finished. did recieve second route result $value");
+                  'call me when page is finished. did recieve second route result $value');
             });
           },
         ),
@@ -312,9 +306,11 @@ class PlatformRouteWidget extends StatelessWidget {
     );
   }
 }
+
 class FlutterRouteWidget extends StatefulWidget {
-  FlutterRouteWidget({this.params,this.message});
-  final Map params;
+  const FlutterRouteWidget({this.params, this.message});
+
+  final Map<String, dynamic> params;
   final String message;
 
   @override
@@ -322,178 +318,199 @@ class FlutterRouteWidget extends StatefulWidget {
 }
 
 class _FlutterRouteWidgetState extends State<FlutterRouteWidget> {
-  final TextEditingController _usernameController = TextEditingController();
-
   @override
   Widget build(BuildContext context) {
-    final String message=widget.message;
+    final String message = widget.message;
     return Scaffold(
       appBar: AppBar(
-        brightness:Brightness.light,
+        brightness: Brightness.light,
         backgroundColor: Colors.white,
-        textTheme:new TextTheme(title: TextStyle(color: Colors.black)) ,
-
-        title: Text('flutter_boost_example'),
+        textTheme: const TextTheme(title: TextStyle(color: Colors.black)),
+        title: const Text('flutter_boost_example'),
       ),
       body: SingleChildScrollView(
-        child:Container(
-            margin: const EdgeInsets.all(24.0),
-            child: Column(
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: <Widget>[
-                Container(
-                  margin: const EdgeInsets.only(top: 10.0,bottom: 20.0),
-                  child: Text(
-                    message ?? "This is a flutter activity \n params:${widget.params}",
-                    style: TextStyle(fontSize: 28.0, color: Colors.blue),
-                  ),
-                  alignment: AlignmentDirectional.center,
+        child: Container(
+          margin: const EdgeInsets.all(24.0),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: <Widget>[
+              Container(
+                margin: const EdgeInsets.only(top: 10.0, bottom: 20.0),
+                child: Text(
+                  message ??
+                      'This is a flutter activity \n params:${widget.params}',
+                  style: TextStyle(fontSize: 28.0, color: Colors.blue),
                 ),
-//                Expanded(child: Container()),
-                const CupertinoTextField(
-                  prefix: Icon(
-                    CupertinoIcons.person_solid,
-                    color: CupertinoColors.lightBackgroundGray,
-                    size: 28.0,
+                alignment: AlignmentDirectional.center,
+              ),
+              const CupertinoTextField(
+                prefix: Icon(
+                  CupertinoIcons.person_solid,
+                  color: CupertinoColors.lightBackgroundGray,
+                  size: 28.0,
+                ),
+                padding: EdgeInsets.symmetric(horizontal: 6.0, vertical: 12.0),
+                clearButtonMode: OverlayVisibilityMode.editing,
+                textCapitalization: TextCapitalization.words,
+                autocorrect: false,
+                decoration: BoxDecoration(
+                  border: Border(
+                    bottom: BorderSide(
+                        width: 0.0, color: CupertinoColors.inactiveGray),
                   ),
-                  padding: EdgeInsets.symmetric(horizontal: 6.0, vertical: 12.0),
-                  clearButtonMode: OverlayVisibilityMode.editing,
-                  textCapitalization: TextCapitalization.words,
-                  autocorrect: false,
-                  decoration: BoxDecoration(
-                    border: Border(bottom: BorderSide(width: 0.0, color: CupertinoColors.inactiveGray)),
+                ),
+                placeholder: 'Name',
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'open native page',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
                   ),
-                  placeholder: 'Name',
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open native page',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("sample://nativePage", urlParams: <dynamic,dynamic>{
-                    "query": {"aaa": "bbb"}
-                  }),
+
+                /// 后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                /// 例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'sample://nativePage',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'}
+                  },
+                ),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'open first',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open first',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("first", urlParams: <dynamic,dynamic>{
-                    "query": {"aaa": "bbb"}
-                  }),
+
+                /// 后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                /// 例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'first',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'}
+                  },
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open second',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("second", urlParams:<dynamic,dynamic> {
-                    "query": {"aaa": "bbb"}
-                  }),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'open second',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open tab',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("tab", urlParams:<dynamic,dynamic> {
-                    "query": {"aaa": "bbb"}
-                  }),
+
+                /// 后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                /// 例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'second',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'}
+                  },
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open flutter page',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("sample://flutterPage", urlParams:<String,dynamic> {
-                    "query": {"aaa": "bbb"}
-                  }),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'open tab',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'push flutter widget',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-                  onTap: () {
-                  Navigator.push<dynamic>(context,
-                        MaterialPageRoute<dynamic>(builder: (_) => PushWidget()));
+
+                /// 后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                /// 例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'tab',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'}
                   },
                 ),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'open flutter page',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
+                ),
 
+                /// 后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                /// 例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'sample://flutterPage',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'}
+                  },
+                ),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'push flutter widget',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
+                ),
+                onTap: () {
+                  Navigator.push<dynamic>(
+                    context,
+                    MaterialPageRoute<dynamic>(builder: (_) => PushWidget()),
+                  );
+                },
+              ),
               InkWell(
                 child: Container(
-                    padding: const EdgeInsets.all(8.0),
-                    margin: const EdgeInsets.all(8.0),
-                    color: Colors.yellow,
-                    child: Text(
-                      'push Platform demo',
-                      style: TextStyle(fontSize: 22.0, color: Colors.black),
-                    )),
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'push Platform demo',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
+                ),
                 onTap: () {
-                  Navigator.push<dynamic>(context,
-                      MaterialPageRoute<dynamic>(builder: (_) => PlatformRouteWidget()));
+                  Navigator.push<dynamic>(
+                    context,
+                    MaterialPageRoute<dynamic>(
+                        builder: (_) => PlatformRouteWidget()),
+                  );
                 },
               ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open flutter fragment page',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-                  onTap: () => FlutterBoost.singleton
-                      .open("sample://flutterFragmentPage"),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: const Text(
+                    'open flutter fragment page',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
                 ),
-              ],
-            ),
-
+                onTap: () =>
+                    FlutterBoost.singleton.open('sample://flutterFragmentPage'),
+              ),
+            ],
+          ),
         ),
       ),
     );
@@ -501,23 +518,21 @@ class _FlutterRouteWidgetState extends State<FlutterRouteWidget> {
 }
 
 class FragmentRouteWidget extends StatelessWidget {
-  final Map params;
+  const FragmentRouteWidget(this.params);
 
-  FragmentRouteWidget(this.params);
+  final Map<String, dynamic> params;
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text('flutter_boost_example'),
-      ),
+      appBar: AppBar(title: const Text('flutter_boost_example')),
       body: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: <Widget>[
           Container(
             margin: const EdgeInsets.only(top: 80.0),
             child: Text(
-              "This is a flutter fragment",
+              'This is a flutter fragment',
               style: TextStyle(fontSize: 28.0, color: Colors.blue),
             ),
             alignment: AlignmentDirectional.center,
@@ -525,7 +540,7 @@ class FragmentRouteWidget extends StatelessWidget {
           Container(
             margin: const EdgeInsets.only(top: 32.0),
             child: Text(
-              params['tag'] ?? '',
+              '${params['tag']}' ?? '',
               style: TextStyle(fontSize: 28.0, color: Colors.red),
             ),
             alignment: AlignmentDirectional.center,
@@ -533,37 +548,40 @@ class FragmentRouteWidget extends StatelessWidget {
           Expanded(child: Container()),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.all(8.0),
-                color: Colors.yellow,
-                child: Text(
-                  'open native page',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
-            onTap: () => FlutterBoost.singleton.open("sample://nativePage"),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.all(8.0),
+              color: Colors.yellow,
+              child: const Text(
+                'open native page',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
+            onTap: () => FlutterBoost.singleton.open('sample://nativePage'),
           ),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.all(8.0),
-                color: Colors.yellow,
-                child: Text(
-                  'open flutter page',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
-            onTap: () => FlutterBoost.singleton.open("sample://flutterPage"),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.all(8.0),
+              color: Colors.yellow,
+              child: const Text(
+                'open flutter page',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
+            onTap: () => FlutterBoost.singleton.open('sample://flutterPage'),
           ),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.fromLTRB(8.0, 8.0, 8.0, 80.0),
-                color: Colors.yellow,
-                child: Text(
-                  'open flutter fragment page',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.fromLTRB(8.0, 8.0, 8.0, 80.0),
+              color: Colors.yellow,
+              child: const Text(
+                'open flutter fragment page',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
             onTap: () =>
-                FlutterBoost.singleton.open("sample://flutterFragmentPage"),
+                FlutterBoost.singleton.open('sample://flutterFragmentPage'),
           )
         ],
       ),
@@ -579,15 +597,8 @@ class PushWidget extends StatefulWidget {
 class _PushWidgetState extends State<PushWidget> {
   VoidCallback _backPressedListenerUnsub;
 
-  @override
-  void initState() {
-    // TODO: implement initState
-    super.initState();
-  }
-
   @override
   void didChangeDependencies() {
-    // TODO: implement didChangeDependencies
     super.didChangeDependencies();
 
 //    if (_backPressedListenerUnsub == null) {
@@ -603,7 +614,6 @@ class _PushWidgetState extends State<PushWidget> {
 
   @override
   void dispose() {
-    // TODO: implement dispose
     print('[XDEBUG] - PushWidget is disposing~');
     super.dispose();
     _backPressedListenerUnsub?.call();
@@ -611,6 +621,6 @@ class _PushWidgetState extends State<PushWidget> {
 
   @override
   Widget build(BuildContext context) {
-    return FlutterRouteWidget(message: "Pushed Widget");
+    return const FlutterRouteWidget(message: 'Pushed Widget');
   }
 }

example/lib/test_input.dart

 import 'package:flutter/material.dart';
 
 class TestPage extends StatefulWidget {
-  TestPage({Key key, this.title = "Input Test"}) : super(key: key);
+  const TestPage({
+    Key key,
+    this.title = 'Input Test',
+  }) : super(key: key);
 
   final String title;
 
@@ -18,95 +21,82 @@ class _TestPageState extends State<TestPage> {
     });
   }
 
-  @override
-  void initState() {
-    // TODO: implement initState
-    super.initState();
-  }
-
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text(widget.title),
-      ),
+      appBar: AppBar(title: Text(widget.title)),
       body: SafeArea(
-          bottom: false,
-          child: ListView(
-        children: <Widget>[
-          Container(
-            child: Text(
-              'You have pushed the button this many times:',
+        bottom: false,
+        child: ListView(
+          children: <Widget>[
+            Container(
+              child: const Text(
+                'You have pushed the button this many times:',
+              ),
+              margin: const EdgeInsets.all(8.0),
+              alignment: Alignment.center,
             ),
-            margin: const EdgeInsets.all(8.0),
-            alignment: Alignment.center,
-          ),
-          Container(
-            child: Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.display1,
+            Container(
+              child: Text(
+                '$_counter',
+                style: Theme.of(context).textTheme.display1,
+              ),
+              margin: const EdgeInsets.all(8.0),
+              alignment: Alignment.center,
             ),
-            margin: const EdgeInsets.all(8.0),
-            alignment: Alignment.center,
-          ),
-          Container(
-            child: TextField(
-              minLines: 2,
-              maxLines: 10,
+            Container(
+              child: const TextField(minLines: 2, maxLines: 10),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          TestTextField(),
-          Container(
-            child: Container(
-              color: Colors.red,
-              width: double.infinity,
-              height: 128.0,
+            TestTextField(),
+            Container(
+              child: Container(
+                color: Colors.red,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.orange,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.orange,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.green,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.green,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.blue,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.blue,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.yellow,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.yellow,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: TextField(
-              minLines: 2,
-              maxLines: 10,
+            Container(
+              child: const TextField(minLines: 2, maxLines: 10),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          TestTextField(),
-        ],
-      )),
+            TestTextField(),
+          ],
+        ),
+      ),
       floatingActionButton: FloatingActionButton(
         onPressed: _incrementCounter,
         tooltip: 'Increment',
@@ -123,22 +113,22 @@ class TestTextField extends StatefulWidget {
 
 class _TestTextFieldState extends State<TestTextField> {
   FocusNode _node;
-  PersistentBottomSheetController _controller;
+  PersistentBottomSheetController<dynamic> _controller;
 
   @override
   void initState() {
-    // TODO: implement initState
     super.initState();
     _node = FocusNode();
     _node.addListener(() {
       if (_node.hasFocus) {
         print('showBottomSheet');
-        _controller = Scaffold.of(context)
-            .showBottomSheet<dynamic>((BuildContext ctx) => Container(
-                  width: double.infinity,
-                  height: 36.0,
-                  color: Colors.deepPurple,
-                ));
+        _controller = Scaffold.of(context).showBottomSheet<dynamic>(
+          (BuildContext ctx) => Container(
+            width: double.infinity,
+            height: 36.0,
+            color: Colors.deepPurple,
+          ),
+        );
       } else {
         if (_controller != null) {
           //Navigator.of(context).pop();

example/test/widget_test.dart

@@ -6,13 +6,12 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
-
-import '../lib/main.dart';
+import 'package:flutter_boost_example/main.dart';
 
 void main() {
   testWidgets('Verify Platform version', (WidgetTester tester) async {
     // Build our app and trigger a frame.
-    await tester.pumpWidget(new MyApp());
+    await tester.pumpWidget(MyApp());
 
     // Verify that platform version is retrieved.
     expect(

example_swift/lib/main.dart

@@ -16,17 +16,22 @@ class _MyAppState extends State<MyApp> {
   void initState() {
     super.initState();
 
-    FlutterBoost.singleton.registerPageBuilders({
-      'first': (pageName, params, _) => FirstRouteWidget(),
-      'second': (pageName, params, _) => SecondRouteWidget(),
-      'tab': (pageName, params, _) => TabRouteWidget(),
-      'flutterFragment': (pageName, params, _) => FragmentRouteWidget(params),
+    FlutterBoost.singleton.registerPageBuilders(<String, PageBuilder>{
+      'first': (String pageName, Map<String, dynamic> params, String _) =>
+          FirstRouteWidget(),
+      'second': (String pageName, Map<String, dynamic> params, String _) =>
+          SecondRouteWidget(),
+      'tab': (String pageName, Map<String, dynamic> params, String _) =>
+          TabRouteWidget(),
+      'flutterFragment':
+          (String pageName, Map<String, dynamic> params, String _) =>
+              FragmentRouteWidget(params),
 
       ///可以在native层通过 getContainerParams 来传递参数
-      'flutterPage': (pageName, params, _) {
-        print("flutterPage params:$params");
+      'flutterPage': (String pageName, Map<String, dynamic> params, String _) {
+        print('flutterPage params:$params');
 
-        return FlutterRouteWidget();
+        return const FlutterRouteWidget();
       },
     });
   }
@@ -34,12 +39,17 @@ class _MyAppState extends State<MyApp> {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-        title: 'Flutter Boost example',
-        builder: FlutterBoost.init(postPush: _onRoutePushed),
-        home: Container());
+      title: 'Flutter Boost example',
+      builder: FlutterBoost.init(postPush: _onRoutePushed),
+      home: Container(),
+    );
   }
 
   void _onRoutePushed(
-      String pageName, String uniqueId, Map params, Route route, Future _) {
-  }
+    String pageName,
+    String uniqueId,
+    Map<String, dynamic> params,
+    Route<dynamic> route,
+    Future<dynamic> _,
+  ) {}
 }

example_swift/lib/simple_page_widgets.dart

@@ -6,15 +6,18 @@ class FirstRouteWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('First Route'),
+        title: const Text('First Route'),
       ),
       body: Center(
         child: RaisedButton(
-          child: Text('Open second route'),
+          child: const Text('Open second route'),
           onPressed: () {
-            print("open second page!");
-            FlutterBoost.singleton.open("second").then((Map value) {
-              print("call me when page is finished. did recieve second route result $value");
+            print('open second page!');
+            FlutterBoost.singleton
+                .open('second')
+                .then((Map<String, dynamic> value) {
+              print(
+                  'call me when page is finished. did recieve second route result $value');
             });
           },
         ),
@@ -28,19 +31,21 @@ class SecondRouteWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("Second Route"),
+        title: const Text('Second Route'),
       ),
       body: Center(
         child: RaisedButton(
           onPressed: () {
             // Navigate back to first route when tapped.
 
-            BoostContainerSettings settings =
+            final BoostContainerSettings settings =
                 BoostContainer.of(context).settings;
-            FlutterBoost.singleton.close(settings.uniqueId,
-                result: <dynamic,dynamic>{"result": "data from second"});
+            FlutterBoost.singleton.close(
+              settings.uniqueId,
+              result: <String, dynamic>{'result': 'data from second'},
+            );
           },
-          child: Text('Go back with result!'),
+          child: const Text('Go back with result!'),
         ),
       ),
     );
@@ -51,15 +56,13 @@ class TabRouteWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text("Tab Route"),
-      ),
+      appBar: AppBar(title: const Text('Tab Route')),
       body: Center(
         child: RaisedButton(
           onPressed: () {
-            FlutterBoost.singleton.open("second");
+            FlutterBoost.singleton.open('second');
           },
-          child: Text('Open second route'),
+          child: const Text('Open second route'),
         ),
       ),
     );
@@ -67,15 +70,15 @@ class TabRouteWidget extends StatelessWidget {
 }
 
 class FlutterRouteWidget extends StatelessWidget {
-  final String message;
+  const FlutterRouteWidget({this.message});
 
-  FlutterRouteWidget({this.message});
+  final String message;
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('flutter_boost_example'),
+        title: const Text('flutter_boost_example'),
       ),
       body: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -83,7 +86,7 @@ class FlutterRouteWidget extends StatelessWidget {
           Container(
             margin: const EdgeInsets.only(top: 80.0),
             child: Text(
-              message ?? "This is a flutter activity",
+              message ?? 'This is a flutter activity',
               style: TextStyle(fontSize: 28.0, color: Colors.blue),
             ),
             alignment: AlignmentDirectional.center,
@@ -101,10 +104,12 @@ class FlutterRouteWidget extends StatelessWidget {
 
             ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
             ///例如：sample://nativePage?aaa=bbb
-            onTap: () =>
-                FlutterBoost.singleton.open("sample://nativePage", urlParams: <dynamic,dynamic>{
-                  "query": {"aaa": "bbb"}
-                }),
+            onTap: () => FlutterBoost.singleton.open(
+              'sample://nativePage',
+              urlParams: <String, dynamic>{
+                'query': <String, dynamic>{'aaa': 'bbb'}
+              },
+            ),
           ),
           InkWell(
             child: Container(
@@ -118,36 +123,42 @@ class FlutterRouteWidget extends StatelessWidget {
 
             ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
             ///例如：sample://nativePage?aaa=bbb
-            onTap: () =>
-                FlutterBoost.singleton.open("sample://flutterPage", urlParams: <dynamic,dynamic>{
-                  "query": {"aaa": "bbb"}
-                }),
+            onTap: () => FlutterBoost.singleton.open(
+              'sample://flutterPage',
+              urlParams: <String, dynamic>{
+                'query': <String, dynamic>{'aaa': 'bbb'},
+              },
+            ),
           ),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.all(8.0),
-                color: Colors.yellow,
-                child: Text(
-                  'push flutter widget',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.all(8.0),
+              color: Colors.yellow,
+              child: Text(
+                'push flutter widget',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
             onTap: () {
               Navigator.push<dynamic>(
-                  context, MaterialPageRoute<dynamic>(builder: (_) => PushWidget()));
+                context,
+                MaterialPageRoute<dynamic>(builder: (_) => PushWidget()),
+              );
             },
           ),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.all(8.0),
-                color: Colors.yellow,
-                child: Text(
-                  'open flutter fragment page',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.all(8.0),
+              color: Colors.yellow,
+              child: Text(
+                'open flutter fragment page',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
             onTap: () =>
-                FlutterBoost.singleton.open("sample://flutterFragmentPage"),
+                FlutterBoost.singleton.open('sample://flutterFragmentPage'),
           ),
         ],
       ),
@@ -156,15 +167,15 @@ class FlutterRouteWidget extends StatelessWidget {
 }
 
 class FragmentRouteWidget extends StatelessWidget {
-  final Map params;
+  const FragmentRouteWidget(this.params);
 
-  FragmentRouteWidget(this.params);
+  final Map<String, dynamic> params;
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('flutter_boost_example'),
+        title: const Text('flutter_boost_example'),
       ),
       body: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -172,7 +183,7 @@ class FragmentRouteWidget extends StatelessWidget {
           Container(
             margin: const EdgeInsets.only(top: 80.0),
             child: Text(
-              "This is a flutter fragment",
+              'This is a flutter fragment',
               style: TextStyle(fontSize: 28.0, color: Colors.blue),
             ),
             alignment: AlignmentDirectional.center,
@@ -180,7 +191,7 @@ class FragmentRouteWidget extends StatelessWidget {
           Container(
             margin: const EdgeInsets.only(top: 32.0),
             child: Text(
-              params['tag'] ?? '',
+              '${params['tag']}' ?? '',
               style: TextStyle(fontSize: 28.0, color: Colors.red),
             ),
             alignment: AlignmentDirectional.center,
@@ -188,37 +199,40 @@ class FragmentRouteWidget extends StatelessWidget {
           Expanded(child: Container()),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.all(8.0),
-                color: Colors.yellow,
-                child: Text(
-                  'open native page',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
-            onTap: () => FlutterBoost.singleton.open("sample://nativePage"),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.all(8.0),
+              color: Colors.yellow,
+              child: Text(
+                'open native page',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
+            onTap: () => FlutterBoost.singleton.open('sample://nativePage'),
           ),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.all(8.0),
-                color: Colors.yellow,
-                child: Text(
-                  'open flutter page',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
-            onTap: () => FlutterBoost.singleton.open("sample://flutterPage"),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.all(8.0),
+              color: Colors.yellow,
+              child: Text(
+                'open flutter page',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
+            onTap: () => FlutterBoost.singleton.open('sample://flutterPage'),
           ),
           InkWell(
             child: Container(
-                padding: const EdgeInsets.all(8.0),
-                margin: const EdgeInsets.fromLTRB(8.0, 8.0, 8.0, 80.0),
-                color: Colors.yellow,
-                child: Text(
-                  'open flutter fragment page',
-                  style: TextStyle(fontSize: 22.0, color: Colors.black),
-                )),
+              padding: const EdgeInsets.all(8.0),
+              margin: const EdgeInsets.fromLTRB(8.0, 8.0, 8.0, 80.0),
+              color: Colors.yellow,
+              child: Text(
+                'open flutter fragment page',
+                style: TextStyle(fontSize: 22.0, color: Colors.black),
+              ),
+            ),
             onTap: () =>
-                FlutterBoost.singleton.open("sample://flutterFragmentPage"),
+                FlutterBoost.singleton.open('sample://flutterFragmentPage'),
           )
         ],
       ),
@@ -234,15 +248,8 @@ class PushWidget extends StatefulWidget {
 class _PushWidgetState extends State<PushWidget> {
   VoidCallback _backPressedListenerUnsub;
 
-  @override
-  void initState() {
-    // TODO: implement initState
-    super.initState();
-  }
-
   @override
   void didChangeDependencies() {
-    // TODO: implement didChangeDependencies
     super.didChangeDependencies();
 
 //    if (_backPressedListenerUnsub == null) {
@@ -258,13 +265,12 @@ class _PushWidgetState extends State<PushWidget> {
 
   @override
   void dispose() {
-    // TODO: implement dispose
     super.dispose();
     _backPressedListenerUnsub?.call();
   }
 
   @override
   Widget build(BuildContext context) {
-    return FlutterRouteWidget(message: "Pushed Widget");
+    return const FlutterRouteWidget(message: 'Pushed Widget');
   }
 }

example_swift/lib/test_input.dart

 import 'package:flutter/material.dart';
 
 class TestPage extends StatefulWidget {
-  TestPage({Key key, this.title = "Input Test"}) : super(key: key);
+  const TestPage({
+    Key key,
+    this.title = 'Input Test',
+  }) : super(key: key);
 
   final String title;
 
@@ -18,100 +21,87 @@ class _TestPageState extends State<TestPage> {
     });
   }
 
-  @override
-  void initState() {
-    // TODO: implement initState
-    super.initState();
-  }
-
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: Text(widget.title),
-      ),
+      appBar: AppBar(title: Text(widget.title)),
       body: SafeArea(
-          bottom: false,
-          child: ListView(
-        children: <Widget>[
-          Container(
-            child: Text(
-              'You have pushed the button this many times:',
+        bottom: false,
+        child: ListView(
+          children: <Widget>[
+            Container(
+              child: const Text(
+                'You have pushed the button this many times:',
+              ),
+              margin: const EdgeInsets.all(8.0),
+              alignment: Alignment.center,
             ),
-            margin: const EdgeInsets.all(8.0),
-            alignment: Alignment.center,
-          ),
-          Container(
-            child: Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.display1,
+            Container(
+              child: Text(
+                '$_counter',
+                style: Theme.of(context).textTheme.display1,
+              ),
+              margin: const EdgeInsets.all(8.0),
+              alignment: Alignment.center,
             ),
-            margin: const EdgeInsets.all(8.0),
-            alignment: Alignment.center,
-          ),
-          Container(
-            child: TextField(
-              minLines: 2,
-              maxLines: 10,
+            Container(
+              child: const TextField(minLines: 2, maxLines: 10),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          TestTextField(),
-          Container(
-            child: Container(
-              color: Colors.red,
-              width: double.infinity,
-              height: 128.0,
+            TestTextField(),
+            Container(
+              child: Container(
+                color: Colors.red,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.orange,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.orange,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.green,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.green,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.blue,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.blue,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: Container(
-              color: Colors.yellow,
-              width: double.infinity,
-              height: 128.0,
+            Container(
+              child: Container(
+                color: Colors.yellow,
+                width: double.infinity,
+                height: 128.0,
+              ),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          Container(
-            child: TextField(
-              minLines: 2,
-              maxLines: 10,
+            Container(
+              child: const TextField(minLines: 2, maxLines: 10),
+              padding: const EdgeInsets.all(8.0),
             ),
-            padding: const EdgeInsets.all(8.0),
-          ),
-          TestTextField(),
-        ],
-      )),
+            TestTextField(),
+          ],
+        ),
+      ),
       floatingActionButton: FloatingActionButton(
         onPressed: _incrementCounter,
         tooltip: 'Increment',
         child: Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
+      ),
     );
   }
 }
@@ -123,25 +113,24 @@ class TestTextField extends StatefulWidget {
 
 class _TestTextFieldState extends State<TestTextField> {
   FocusNode _node;
-  PersistentBottomSheetController _controller;
+  PersistentBottomSheetController<dynamic> _controller;
 
   @override
   void initState() {
-    // TODO: implement initState
     super.initState();
     _node = FocusNode();
     _node.addListener(() {
       if (_node.hasFocus) {
         print('showBottomSheet');
-        _controller = Scaffold.of(context)
-            .showBottomSheet<dynamic>((BuildContext ctx) => Container(
-                  width: double.infinity,
-                  height: 36.0,
-                  color: Colors.deepPurple,
-                ));
+        _controller = Scaffold.of(context).showBottomSheet<dynamic>(
+          (BuildContext ctx) => Container(
+            width: double.infinity,
+            height: 36.0,
+            color: Colors.deepPurple,
+          ),
+        );
       } else {
         if (_controller != null) {
-          //Navigator.of(context).pop();
           print('closeBottomSheet');
           _controller.close();
         }

lib/channel/boost_channel.dart

@@ -24,30 +24,30 @@
 
 import 'dart:async';
 import 'dart:ui';
-import 'package:flutter/services.dart';
 
-typedef Future<dynamic> EventListener(String name, Map arguments);
-typedef Future<dynamic> MethodHandler(MethodCall call);
+import 'package:flutter/services.dart';
 
-class BoostChannel {
-  final MethodChannel _methodChannel = MethodChannel("flutter_boost");
+typedef EventListener = Future<dynamic> Function(
+    String name, Map<String, dynamic> arguments);
 
-  final Map<String, List<EventListener>> _eventListeners = Map();
-  final Set<MethodHandler> _methodHandlers = Set();
+typedef MethodHandler = Future<dynamic> Function(MethodCall call);
 
+class BoostChannel {
   BoostChannel() {
     _methodChannel.setMethodCallHandler((MethodCall call) {
-      if (call.method == "__event__") {
-        String name = call.arguments["name"];
-        Map arg = call.arguments["arguments"];
-        List<EventListener> list = _eventListeners[name];
+      if (call.method == '__event__') {
+        final String name = call.arguments['name'] as String;
+        final Map<String, dynamic> arg =
+            (call.arguments['arguments'] as Map<dynamic, dynamic>)
+                ?.cast<String, dynamic>();
+        final List<EventListener> list = _eventListeners[name];
         if (list != null) {
-          for (EventListener l in list) {
+          for (final EventListener l in list) {
             l(name, arg);
           }
         }
       } else {
-        for (MethodHandler handler in _methodHandlers) {
+        for (final MethodHandler handler in _methodHandlers) {
           handler(call);
         }
       }
@@ -56,37 +56,41 @@ class BoostChannel {
     });
   }
 
-  void sendEvent(String name, Map arguments) {
+  final MethodChannel _methodChannel = const MethodChannel('flutter_boost');
+
+  final Map<String, List<EventListener>> _eventListeners =
+      <String, List<EventListener>>{};
+  final Set<MethodHandler> _methodHandlers = <MethodHandler>{};
+
+  void sendEvent(String name, Map<String, dynamic> arguments) {
     if (name == null) {
       return;
     }
 
-    if (arguments == null) {
-      arguments = Map<dynamic, dynamic>();
-    }
+    arguments ??= <String, dynamic>{};
 
-    Map msg = Map<dynamic, dynamic>();
-    msg["name"] = name;
-    msg["arguments"] = arguments;
-    _methodChannel.invokeMethod<dynamic>("__event__", msg);
+    final Map<String, dynamic> msg = <String, dynamic>{};
+    msg['name'] = name;
+    msg['arguments'] = arguments;
+    _methodChannel.invokeMethod<dynamic>('__event__', msg);
   }
 
   Future<T> invokeMethod<T>(String method, [dynamic arguments]) async {
-    assert(method != "__event__");
+    assert(method != '__event__');
 
     return _methodChannel.invokeMethod<T>(method, arguments);
   }
 
   Future<List<T>> invokeListMethod<T>(String method,
       [dynamic arguments]) async {
-    assert(method != "__event__");
+    assert(method != '__event__');
 
     return _methodChannel.invokeListMethod<T>(method, arguments);
   }
 
   Future<Map<K, V>> invokeMapMethod<K, V>(String method,
       [dynamic arguments]) async {
-    assert(method != "__event__");
+    assert(method != '__event__');
 
     return _methodChannel.invokeMapMethod<K, V>(method, arguments);
   }
@@ -94,9 +98,11 @@ class BoostChannel {
   VoidCallback addEventListener(String name, EventListener listener) {
     assert(name != null && listener != null);
 
-    List<EventListener> list = _eventListeners[name];
+    List<EventListener> list;
+    list = _eventListeners[name];
+
     if (list == null) {
-      list = List();
+      list = <EventListener>[];
       _eventListeners[name] = list;
     }
 

lib/container/boost_container.dart

@@ -22,10 +22,11 @@
  * THE SOFTWARE.
  */
 import 'package:flutter/material.dart';
-import 'container_manager.dart';
+
 import '../flutter_boost.dart';
-import 'boost_page_route.dart';
 import '../support/logger.dart';
+import 'boost_page_route.dart';
+import 'container_manager.dart';
 
 enum ContainerLifeCycle {
   Init,
@@ -37,28 +38,31 @@ enum ContainerLifeCycle {
   Foreground
 }
 
-typedef void BoostContainerLifeCycleObserver(
-    ContainerLifeCycle state, BoostContainerSettings settings);
+typedef BoostContainerLifeCycleObserver = void Function(
+  ContainerLifeCycle state,
+  BoostContainerSettings settings,
+);
 
 class BoostContainer extends Navigator {
-  final BoostContainerSettings settings;
-
-  const BoostContainer(
-      {GlobalKey<BoostContainerState> key,
-      this.settings = const BoostContainerSettings(),
-      String initialRoute,
-      RouteFactory onGenerateRoute,
-      RouteFactory onUnknownRoute,
-      List<NavigatorObserver> observers})
-      : super(
-            key: key,
-            initialRoute: initialRoute,
-            onGenerateRoute: onGenerateRoute,
-            onUnknownRoute: onUnknownRoute,
-            observers: observers);
-
-  factory BoostContainer.copy(Navigator navigator,
-          [BoostContainerSettings settings = const BoostContainerSettings()]) =>
+  const BoostContainer({
+    GlobalKey<BoostContainerState> key,
+    this.settings = const BoostContainerSettings(),
+    String initialRoute,
+    RouteFactory onGenerateRoute,
+    RouteFactory onUnknownRoute,
+    List<NavigatorObserver> observers,
+  }) : super(
+          key: key,
+          initialRoute: initialRoute,
+          onGenerateRoute: onGenerateRoute,
+          onUnknownRoute: onUnknownRoute,
+          observers: observers,
+        );
+
+  factory BoostContainer.copy(
+    Navigator navigator, [
+    BoostContainerSettings settings = const BoostContainerSettings(),
+  ]) =>
       BoostContainer(
         key: GlobalKey<BoostContainerState>(),
         settings: settings,
@@ -69,28 +73,34 @@ class BoostContainer extends Navigator {
       );
 
   factory BoostContainer.obtain(
-          Navigator navigator, BoostContainerSettings settings) =>
+    Navigator navigator,
+    BoostContainerSettings settings,
+  ) =>
       BoostContainer(
-          key: GlobalKey<BoostContainerState>(),
-          settings: settings,
-          onGenerateRoute: (RouteSettings routeSettings) {
-            if (routeSettings.name == '/') {
-              return BoostPageRoute<dynamic>(
-                  pageName: settings.name,
-                  params: settings.params,
-                  uniqueId: settings.uniqueId,
-                  animated: false,
-                  settings: routeSettings,
-                  builder: settings.builder);
-            } else {
-              return navigator.onGenerateRoute(routeSettings);
-            }
-          },
-          observers: <NavigatorObserver>[
-            ContainerNavigatorObserver.bindContainerManager(),
-            HeroController(),
-          ],
-          onUnknownRoute: navigator.onUnknownRoute);
+        key: GlobalKey<BoostContainerState>(),
+        settings: settings,
+        onGenerateRoute: (RouteSettings routeSettings) {
+          if (routeSettings.name == '/') {
+            return BoostPageRoute<dynamic>(
+              pageName: settings.name,
+              params: settings.params,
+              uniqueId: settings.uniqueId,
+              animated: false,
+              settings: routeSettings,
+              builder: settings.builder,
+            );
+          } else {
+            return navigator.onGenerateRoute(routeSettings);
+          }
+        },
+        observers: <NavigatorObserver>[
+          ContainerNavigatorObserver.bindContainerManager(),
+          HeroController(),
+        ],
+        onUnknownRoute: navigator.onUnknownRoute,
+      );
+
+  final BoostContainerSettings settings;
 
   @override
   BoostContainerState createState() => BoostContainerState();
@@ -121,7 +131,7 @@ class BoostContainerState extends NavigatorState {
 
   String get name => widget.settings.name;
 
-  Map get params => widget.settings.params;
+  Map<String, dynamic> get params => widget.settings.params;
 
   BoostContainerSettings get settings => widget.settings;
 
@@ -138,7 +148,7 @@ class BoostContainerState extends NavigatorState {
 
   ContainerNavigatorObserver findContainerNavigatorObserver(
       Navigator navigator) {
-    for (NavigatorObserver observer in navigator.observers) {
+    for (final NavigatorObserver observer in navigator.observers) {
       if (observer is ContainerNavigatorObserver) {
         return observer;
       }
@@ -153,11 +163,6 @@ class BoostContainerState extends NavigatorState {
     backPressedHandler = () => maybePop();
   }
 
-  @override
-  void didUpdateWidget(Navigator oldWidget) {
-    super.didUpdateWidget(oldWidget);
-  }
-
   @override
   void dispose() {
     routerHistory.clear();
@@ -172,7 +177,7 @@ class BoostContainerState extends NavigatorState {
 
   @override
   Future<bool> maybePop<T extends Object>([T result]) async {
-    final Route<T> route = routerHistory.last;
+    final Route<T> route = routerHistory.last as Route<T>;
     final RoutePopDisposition disposition = await route.willPop();
     if (mounted) {
       switch (disposition) {
@@ -199,7 +204,7 @@ class BoostContainerState extends NavigatorState {
     }
 
     if (canPop()) {
-         super.pop<T>(result);
+      super.pop<T>(result);
     } else {
       if (T is Map<String, dynamic>) {
         FlutterBoost.singleton
@@ -216,10 +221,10 @@ class BoostContainerState extends NavigatorState {
     Route<T> newRoute;
     if (FlutterBoost.containerManager.prePushRoute != null) {
       newRoute = FlutterBoost.containerManager
-          .prePushRoute(name, uniqueId, params, route);
+          .prePushRoute<T>(name, uniqueId, params, route);
     }
 
-    Future<T> future = super.push<T>(newRoute ?? route);
+    final Future<T> future = super.push<T>(newRoute ?? route);
 
     routerHistory.add(route);
 
@@ -233,25 +238,30 @@ class BoostContainerState extends NavigatorState {
 
   VoidCallback addLifeCycleObserver(BoostContainerLifeCycleObserver observer) {
     return FlutterBoost.singleton.addBoostContainerLifeCycleObserver(
-        (ContainerLifeCycle state, BoostContainerSettings settings) {
-      if (settings.uniqueId == uniqueId) {
-        observer(state, settings);
-      }
-    });
+      (
+        ContainerLifeCycle state,
+        BoostContainerSettings settings,
+      ) {
+        if (settings.uniqueId == uniqueId) {
+          observer(state, settings);
+        }
+      },
+    );
   }
 }
 
 class BoostContainerSettings {
+  const BoostContainerSettings({
+    this.uniqueId = 'default',
+    this.name = 'default',
+    this.params,
+    this.builder,
+  });
+
   final String uniqueId;
   final String name;
-  final Map params;
+  final Map<String, dynamic> params;
   final WidgetBuilder builder;
-
-  const BoostContainerSettings(
-      {this.uniqueId = 'default',
-      this.name = 'default',
-      this.params,
-      this.builder});
 }
 
 class ContainerElement extends StatefulElement {
@@ -259,13 +269,13 @@ class ContainerElement extends StatefulElement {
 }
 
 class ContainerNavigatorObserver extends NavigatorObserver {
-  static final Set<NavigatorObserver> boostObservers = Set<NavigatorObserver>();
-
   ContainerNavigatorObserver();
 
   factory ContainerNavigatorObserver.bindContainerManager() =>
       ContainerNavigatorObserver();
 
+  static final Set<NavigatorObserver> boostObservers = <NavigatorObserver>{};
+
   VoidCallback addBoostNavigatorObserver(NavigatorObserver observer) {
     boostObservers.add(observer);
 
@@ -278,28 +288,28 @@ class ContainerNavigatorObserver extends NavigatorObserver {
 
   @override
   void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
-    for (NavigatorObserver observer in boostObservers) {
+    for (final NavigatorObserver observer in boostObservers) {
       observer.didPush(route, previousRoute);
     }
   }
 
   @override
   void didPop(Route<dynamic> route, Route<dynamic> previousRoute) {
-    for (NavigatorObserver observer in boostObservers) {
+    for (final NavigatorObserver observer in boostObservers) {
       observer.didPop(route, previousRoute);
     }
   }
 
   @override
   void didRemove(Route<dynamic> route, Route<dynamic> previousRoute) {
-    for (NavigatorObserver observer in boostObservers) {
+    for (final NavigatorObserver observer in boostObservers) {
       observer.didRemove(route, previousRoute);
     }
   }
 
   @override
   void didReplace({Route<dynamic> newRoute, Route<dynamic> oldRoute}) {
-    for (NavigatorObserver observer in boostObservers) {
+    for (final NavigatorObserver observer in boostObservers) {
       observer.didReplace(newRoute: newRoute, oldRoute: oldRoute);
     }
   }

lib/container/boost_page_route.dart

@@ -25,26 +25,25 @@
 import 'package:flutter/widgets.dart';
 import 'package:flutter/material.dart';
 
-typedef Widget PageBuilder(String pageName, Map params, String uniqueId);
+typedef PageBuilder = Widget Function(
+    String pageName, Map<String, dynamic> params, String uniqueId);
 
 class BoostPageRoute<T> extends MaterialPageRoute<T> {
+  BoostPageRoute({
+    this.pageName,
+    this.params,
+    this.uniqueId,
+    this.animated,
+    WidgetBuilder builder,
+    RouteSettings settings,
+  }) : super(builder: builder, settings: settings);
+
   final String pageName;
   final String uniqueId;
-  final Map params;
+  final Map<String, dynamic> params;
   final bool animated;
-  final WidgetBuilder builder;
-  final RouteSettings settings;
-
-  final Set<VoidCallback> backPressedListeners = Set<VoidCallback>();
 
-  BoostPageRoute(
-      {this.pageName,
-      this.params,
-      this.uniqueId,
-      this.animated,
-      this.builder,
-      this.settings})
-      : super(builder: builder, settings: settings);
+  final Set<VoidCallback> backPressedListeners = <VoidCallback>{};
 
   static BoostPageRoute<T> of<T>(BuildContext context) {
     final Route<T> route = ModalRoute.of(context);

lib/container/container_coordinator.dart

@@ -27,12 +27,25 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter/semantics.dart';
 import 'package:flutter/services.dart';
+
 import '../channel/boost_channel.dart';
-import 'boost_container.dart';
 import '../flutter_boost.dart';
 import '../support/logger.dart';
+import 'boost_container.dart';
 
 class ContainerCoordinator {
+  ContainerCoordinator(BoostChannel channel) : assert(_instance == null) {
+    _instance = this;
+
+    channel
+      ..addEventListener(
+        'lifecycle',
+        (String name, Map<String, dynamic> arguments) =>
+            _onChannelEvent(arguments),
+      )
+      ..addMethodHandler((MethodCall call) => _onMethodCall(call));
+  }
+
   static ContainerCoordinator get singleton => _instance;
 
   static ContainerCoordinator _instance;
@@ -40,19 +53,11 @@ class ContainerCoordinator {
   final Map<String, PageBuilder> _pageBuilders = <String, PageBuilder>{};
   PageBuilder _defaultPageBuilder;
 
-  ContainerCoordinator(BoostChannel channel) {
-    assert(_instance == null);
-
-    _instance = this;
-
-    channel.addEventListener("lifecycle",
-        (String name, Map arguments) => _onChannelEvent(arguments));
-
-    channel.addMethodHandler((MethodCall call) => _onMethodCall(call));
-  }
-
   BoostContainerSettings _createContainerSettings(
-      String name, Map params, String pageId) {
+    String name,
+    Map<String, dynamic> params,
+    String pageId,
+  ) {
     Widget page;
 
     final BoostContainerSettings routeSettings = BoostContainerSettings(
@@ -60,12 +65,12 @@ class ContainerCoordinator {
         name: name,
         params: params,
         builder: (BuildContext ctx) {
-          //Try to build a page using keyed builder.
+          // Try to build a page using keyed builder.
           if (_pageBuilders[name] != null) {
             page = _pageBuilders[name](name, params, pageId);
           }
 
-          //Build a page using default builder.
+          // Build a page using default builder.
           if (page == null && _defaultPageBuilder != null) {
             page = _defaultPageBuilder(name, params, pageId);
           }
@@ -79,12 +84,12 @@ class ContainerCoordinator {
     return routeSettings;
   }
 
-  //Register a default page builder.
+  /// Register a default page builder.
   void registerDefaultPageBuilder(PageBuilder builder) {
     _defaultPageBuilder = builder;
   }
 
-  //Register page builder for a key.
+  /// Register page builder for a key.
   void registerPageBuilder(String pageName, PageBuilder builder) {
     if (pageName != null && builder != null) {
       _pageBuilders[pageName] = builder;
@@ -98,41 +103,35 @@ class ContainerCoordinator {
   }
 
   Future<dynamic> _onChannelEvent(dynamic event) {
-    if (event is Map) {
-      Map map = event;
-      final String type = map['type'];
+    if (event is Map<String, dynamic>) {
+      final Map<String, dynamic> map = event;
+      final String type = map['type'] as String;
 
       Logger.log('onEvent $type');
 
       switch (type) {
-        //Handler back key pressed event.
+        // Handler back key pressed event.
         case 'backPressedCallback':
-          {
-            final String id = map['uniqueId'];
-            FlutterBoost.containerManager
-                ?.containerStateOf(id)
-                ?.performBackPressed();
-          }
+          final String id = map['uniqueId'] as String;
+          FlutterBoost.containerManager
+              ?.containerStateOf(id)
+              ?.performBackPressed();
           break;
-        //Enter foregroud
+        // Enter foreground
         case 'foreground':
-          {
-            FlutterBoost.containerManager?.setForeground();
-          }
+          FlutterBoost.containerManager?.setForeground();
           break;
-        //Enter background
+        // Enter background
         case 'background':
-          {
-            FlutterBoost.containerManager?.setBackground();
-          }
+          FlutterBoost.containerManager?.setBackground();
           break;
-        //Schedule a frame.
+        // Schedule a frame.
         case 'scheduleFrame':
-          {
-            WidgetsBinding.instance.scheduleForcedFrame();
-            Future<dynamic>.delayed(Duration(milliseconds: 250),
-                () => WidgetsBinding.instance.scheduleFrame());
-          }
+          WidgetsBinding.instance.scheduleForcedFrame();
+          Future<dynamic>.delayed(
+            const Duration(milliseconds: 250),
+            () => WidgetsBinding.instance.scheduleFrame(),
+          );
           break;
       }
     }
@@ -141,72 +140,52 @@ class ContainerCoordinator {
   }
 
   Future<dynamic> _onMethodCall(MethodCall call) {
-    Logger.log("onMetohdCall ${call.method}");
+    Logger.log('onMetohdCall ${call.method}');
+
+    final String pageName = call.arguments['pageName'] as String;
+    final Map<String, dynamic> params =
+        (call.arguments['params'] as Map<dynamic, dynamic>)
+            ?.cast<String, dynamic>();
+    final String uniqueId = call.arguments['uniqueId'] as String;
 
     switch (call.method) {
-      case "didInitPageContainer":
-        {
-          String pageName = call.arguments["pageName"];
-          Map params = call.arguments["params"];
-          String uniqueId = call.arguments["uniqueId"];
-          _nativeContainerDidInit(pageName, params, uniqueId);
-        }
+      case 'didInitPageContainer':
+        _nativeContainerDidInit(pageName, params, uniqueId);
         break;
-      case "willShowPageContainer":
-        {
-          String pageName = call.arguments["pageName"];
-          Map params = call.arguments["params"];
-          String uniqueId = call.arguments["uniqueId"];
-          _nativeContainerWillShow(pageName, params, uniqueId);
-        }
+      case 'willShowPageContainer':
+        _nativeContainerWillShow(pageName, params, uniqueId);
         break;
-      case "didShowPageContainer":
-        {
-          String pageName = call.arguments["pageName"];
-          Map params = call.arguments["params"];
-          String uniqueId = call.arguments["uniqueId"];
-          nativeContainerDidShow(pageName, params, uniqueId);
-        }
+      case 'didShowPageContainer':
+        nativeContainerDidShow(pageName, params, uniqueId);
         break;
-      case "willDisappearPageContainer":
-        {
-          String pageName = call.arguments["pageName"];
-          Map params = call.arguments["params"];
-          String uniqueId = call.arguments["uniqueId"];
-          _nativeContainerWillDisappear(pageName, params, uniqueId);
-        }
+      case 'willDisappearPageContainer':
+        _nativeContainerWillDisappear(pageName, params, uniqueId);
         break;
-      case "didDisappearPageContainer":
-        {
-          String pageName = call.arguments["pageName"];
-          Map params = call.arguments["params"];
-          String uniqueId = call.arguments["uniqueId"];
-          _nativeContainerDidDisappear(pageName, params, uniqueId);
-        }
+      case 'didDisappearPageContainer':
+        _nativeContainerDidDisappear(pageName, params, uniqueId);
         break;
-      case "willDeallocPageContainer":
-        {
-          String pageName = call.arguments["pageName"];
-          Map params = call.arguments["params"];
-          String uniqueId = call.arguments["uniqueId"];
-          _nativeContainerWillDealloc(pageName, params, uniqueId);
-        }
+      case 'willDeallocPageContainer':
+        _nativeContainerWillDealloc(pageName, params, uniqueId);
         break;
-      case "onNativePageResult":
-        {}
+      case 'onNativePageResult':
         break;
     }
 
     return Future<dynamic>(() {});
   }
 
-  bool _nativeContainerWillShow(String name, Map params, String pageId) {
+  bool _nativeContainerWillShow(
+    String name,
+    Map<String, dynamic> params,
+    String pageId,
+  ) {
     if (FlutterBoost.containerManager?.containsContainer(pageId) != true) {
-      FlutterBoost.containerManager
-          ?.pushContainer(_createContainerSettings(name, params, pageId));
+      FlutterBoost.containerManager?.pushContainer(
+        _createContainerSettings(name, params, pageId),
+      );
     }
 
-    //TODO, 需要验证android代码是否也可以移到这里
+    // TODO(unknown): 需要验证android代码是否也可以移到这里
     if (Platform.isIOS) {
       try {
         final SemanticsOwner owner =
@@ -221,11 +200,15 @@ class ContainerCoordinator {
     return true;
   }
 
-  bool nativeContainerDidShow(String name, Map params, String pageId) {
+  bool nativeContainerDidShow(
+    String name,
+    Map<String, dynamic> params,
+    String pageId,
+  ) {
     FlutterBoost.containerManager
         ?.showContainer(_createContainerSettings(name, params, pageId));
 
-    //在Android上对无障碍辅助模式的兼容
+    // Compatible to accessibility mode on Android.
     if (Platform.isAndroid) {
       try {
         final SemanticsOwner owner =
@@ -238,57 +221,93 @@ class ContainerCoordinator {
       }
     }
 
-    performContainerLifeCycle(_createContainerSettings(name, params, pageId),
-        ContainerLifeCycle.Appear);
+    performContainerLifeCycle(
+      _createContainerSettings(name, params, pageId),
+      ContainerLifeCycle.Appear,
+    );
 
     Logger.log(
-        'native containner did show-$name,\nmanager dump:\n${FlutterBoost.containerManager?.dump()}');
+      'native containner did show-$name,\n'
+      'manager dump:\n'
+      '${FlutterBoost.containerManager?.dump()}',
+    );
 
     return true;
   }
 
-  bool _nativeContainerWillDisappear(String name, Map params, String pageId) {
-    performContainerLifeCycle(_createContainerSettings(name, params, pageId),
-        ContainerLifeCycle.WillDisappear);
+  bool _nativeContainerWillDisappear(
+    String name,
+    Map<String, dynamic> params,
+    String pageId,
+  ) {
+    performContainerLifeCycle(
+      _createContainerSettings(name, params, pageId),
+      ContainerLifeCycle.WillDisappear,
+    );
     return true;
   }
 
-  bool _nativeContainerDidDisappear(String name, Map params, String pageId) {
-    performContainerLifeCycle(_createContainerSettings(name, params, pageId),
-        ContainerLifeCycle.Disappear);
+  bool _nativeContainerDidDisappear(
+    String name,
+    Map<String, dynamic> params,
+    String pageId,
+  ) {
+    performContainerLifeCycle(
+      _createContainerSettings(name, params, pageId),
+      ContainerLifeCycle.Disappear,
+    );
     return true;
   }
 
-  bool _nativeContainerDidInit(String name, Map params, String pageId) {
-    performContainerLifeCycle(_createContainerSettings(name, params, pageId),
-        ContainerLifeCycle.Init);
+  bool _nativeContainerDidInit(
+    String name,
+    Map<String, dynamic> params,
+    String pageId,
+  ) {
+    performContainerLifeCycle(
+      _createContainerSettings(name, params, pageId),
+      ContainerLifeCycle.Init,
+    );
     return true;
   }
 
-  bool _nativeContainerWillDealloc(String name, Map params, String pageId) {
+  bool _nativeContainerWillDealloc(
+      String name, Map<String, dynamic> params, String pageId) {
     try {
-      performContainerLifeCycle(_createContainerSettings(name, params, pageId),
-          ContainerLifeCycle.Destroy);
+      performContainerLifeCycle(
+        _createContainerSettings(name, params, pageId),
+        ContainerLifeCycle.Destroy,
+      );
     } catch (e) {
       Logger.log('nativeContainerWillDealloc error: $e');
     }
     FlutterBoost.containerManager?.remove(pageId);
 
     Logger.log(
-        'native containner dealloc for $name, \n manager dump:\n${FlutterBoost.containerManager?.dump()}');
+      'native containner dealloc for $name, \n'
+      'manager dump:\n'
+      '${FlutterBoost.containerManager?.dump()}',
+    );
 
     return true;
   }
 
   static void performContainerLifeCycle(
-      BoostContainerSettings settings, ContainerLifeCycle lifeCycle) {
-    for (BoostContainerLifeCycleObserver observer in FlutterBoost
+    BoostContainerSettings settings,
+    ContainerLifeCycle lifeCycle,
+  ) {
+    final Set<BoostContainerLifeCycleObserver> observers = FlutterBoost
         .singleton.observersHolder
-        .observersOf<BoostContainerLifeCycleObserver>()) {
+        .observersOf<BoostContainerLifeCycleObserver>();
+
+    for (final BoostContainerLifeCycleObserver observer in observers) {
       observer(lifeCycle, settings);
     }
 
     Logger.log(
-        'BoostContainerLifeCycleObserver container:${settings.name} lifeCycle:$lifeCycle');
+      'BoostContainerLifeCycleObserver'
+      'container:${settings.name}'
+      'lifeCycle:$lifeCycle',
+    );
   }
 }

lib/container/container_manager.dart

@@ -23,10 +23,11 @@
  */
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
-import 'boost_container.dart';
-import 'container_coordinator.dart';
+
 import '../flutter_boost.dart';
 import '../support/logger.dart';
+import 'boost_container.dart';
+import 'container_coordinator.dart';
 
 enum ContainerOperation { Push, Onstage, Pop, Remove }
 
@@ -35,12 +36,16 @@ typedef BoostContainerObserver = void Function(
 
 @immutable
 class BoostContainerManager extends StatefulWidget {
+  const BoostContainerManager({
+    Key key,
+    this.initNavigator,
+    this.prePushRoute,
+    this.postPushRoute,
+  }) : super(key: key);
+
   final Navigator initNavigator;
   final PrePushRoute prePushRoute;
   final PostPushRoute postPushRoute;
-  const BoostContainerManager(
-      {Key key, this.initNavigator, this.prePushRoute, this.postPushRoute})
-      : super(key: key);
 
   @override
   ContainerManagerState createState() => ContainerManagerState();
@@ -76,15 +81,15 @@ class ContainerManagerState extends State<BoostContainerManager> {
 
   bool get foreground => _foreground;
 
-  //Number of containers.
+  // Number of containers.
   int get containerCounts => _offstage.length;
 
   List<BoostContainer> get offstage => _offstage;
 
-  //Setting for current visible container.
+  // Setting for current visible container.
   BoostContainerSettings get onstageSettings => _onstage.settings;
 
-  //Current visible container.
+  // Current visible container.
   BoostContainerState get onstageContainer => _stateOf(_onstage);
 
   BoostContainerState get subContainer =>
@@ -118,8 +123,7 @@ class ContainerManagerState extends State<BoostContainerManager> {
   }
 
   BoostContainerState _stateOf(BoostContainer container) {
-    if (container.key != null &&
-        container.key is GlobalKey<BoostContainerState>) {
+    if (container.key is GlobalKey<BoostContainerState>) {
       final GlobalKey<BoostContainerState> globalKey =
           container.key as GlobalKey<BoostContainerState>;
       return globalKey.currentState;
@@ -133,7 +137,7 @@ class ContainerManagerState extends State<BoostContainerManager> {
   void _onShownContainerChanged(String old, String now) {
     Logger.log('onShownContainerChanged old:$old now:$now');
 
-    Map<String, dynamic> properties = new Map<String, dynamic>();
+    final Map<String, dynamic> properties = <String, dynamic>{};
     properties['newName'] = now;
     properties['oldName'] = old;
 
@@ -149,7 +153,7 @@ class ContainerManagerState extends State<BoostContainerManager> {
     }
 
     if (_leastEntries != null && _leastEntries.isNotEmpty) {
-      for (_ContainerOverlayEntry entry in _leastEntries) {
+      for (final _ContainerOverlayEntry entry in _leastEntries) {
         entry.remove();
       }
     }
@@ -223,7 +227,7 @@ class ContainerManagerState extends State<BoostContainerManager> {
 
       setState(() {});
 
-      for (BoostContainerObserver observer in FlutterBoost
+      for (final BoostContainerObserver observer in FlutterBoost
           .singleton.observersHolder
           .observersOf<BoostContainerObserver>()) {
         observer(ContainerOperation.Onstage, _onstage.settings);
@@ -265,7 +269,7 @@ class ContainerManagerState extends State<BoostContainerManager> {
 
     setState(() {});
 
-    for (BoostContainerObserver observer in FlutterBoost
+    for (final BoostContainerObserver observer in FlutterBoost
         .singleton.observersHolder
         .observersOf<BoostContainerObserver>()) {
       observer(ContainerOperation.Push, _onstage.settings);
@@ -280,9 +284,11 @@ class ContainerManagerState extends State<BoostContainerManager> {
     _onstage = _offstage.removeLast();
     setState(() {});
 
-    for (BoostContainerObserver observer in FlutterBoost
+    final Set<BoostContainerObserver> observers = FlutterBoost
         .singleton.observersHolder
-        .observersOf<BoostContainerObserver>()) {
+        .observersOf<BoostContainerObserver>();
+
+    for (final BoostContainerObserver observer in observers) {
       observer(ContainerOperation.Pop, old.settings);
     }
 
@@ -294,32 +300,34 @@ class ContainerManagerState extends State<BoostContainerManager> {
       pop();
     } else {
       final BoostContainer container = _offstage.firstWhere(
-          (BoostContainer container) => container.settings.uniqueId == uniqueId,
-          orElse: () => null);
+        (BoostContainer container) => container.settings.uniqueId == uniqueId,
+        orElse: () => null,
+      );
 
       if (container != null) {
         _offstage.remove(container);
         setState(() {});
 
-        for (BoostContainerObserver observer in FlutterBoost
+        final Set<BoostContainerObserver> observers = FlutterBoost
             .singleton.observersHolder
-            .observersOf<BoostContainerObserver>()) {
+            .observersOf<BoostContainerObserver>();
+
+        for (final BoostContainerObserver observer in observers) {
           observer(ContainerOperation.Remove, container.settings);
         }
 
         Logger.log('ContainerObserver#2 didRemove');
       }
     }
-
-    return null;
   }
 
   bool canPop() => _offstage.isNotEmpty;
 
   String dump() {
-    String info = 'onstage#:\n  ${_onstage?.desc()}\noffstage#:';
+    String info;
+    info = 'onstage#:\n  ${_onstage?.desc()}\noffstage#:';
 
-    for (BoostContainer container in _offstage.reversed) {
+    for (final BoostContainer container in _offstage.reversed) {
       info = '$info\n  ${container?.desc()}';
     }
 
@@ -328,21 +336,21 @@ class ContainerManagerState extends State<BoostContainerManager> {
 }
 
 class _ContainerOverlayEntry extends OverlayEntry {
-  bool _removed = false;
   _ContainerOverlayEntry(BoostContainer container)
       : super(
-            builder: (BuildContext ctx) => container,
-            opaque: true,
-            maintainState: true);
+          builder: (BuildContext ctx) => container,
+          opaque: true,
+          maintainState: true,
+        );
+
+  bool _removed = false;
 
   @override
   void remove() {
     assert(!_removed);
-
     if (_removed) {
       return;
     }
-
     _removed = true;
     super.remove();
   }

lib/flutter_boost.dart

@@ -25,58 +25,78 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'container/boost_container.dart';
-import 'container/container_manager.dart';
 
 import 'channel/boost_channel.dart';
+import 'container/boost_container.dart';
 import 'container/container_coordinator.dart';
+import 'container/container_manager.dart';
 import 'observers_holders.dart';
 
 export 'container/boost_container.dart';
 export 'container/container_manager.dart';
 
-typedef Widget PageBuilder(String pageName, Map params, String uniqueId);
+typedef PageBuilder = Widget Function(
+    String pageName, Map<String, dynamic> params, String uniqueId);
 
-typedef Route PrePushRoute(
-    String url, String uniqueId, Map params, Route route);
+typedef PrePushRoute = Route<T> Function<T>(String url, String uniqueId,
+    Map<String, dynamic> params, Route<dynamic> route);
 
-typedef void PostPushRoute(
-    String url, String uniqueId, Map params, Route route, Future result);
+typedef PostPushRoute = void Function(
+  String url,
+  String uniqueId,
+  Map<String, dynamic> params,
+  Route<dynamic> route,
+  Future<dynamic> result,
+);
 
 class FlutterBoost {
+  FlutterBoost() {
+    ContainerCoordinator(_boostChannel);
+  }
+
   static final FlutterBoost _instance = FlutterBoost();
-  final GlobalKey<ContainerManagerState> containerManagerKey =
-      GlobalKey<ContainerManagerState>();
-  final ObserversHolder _observersHolder = ObserversHolder();
-  final BoostChannel _boostChannel = BoostChannel();
 
   static FlutterBoost get singleton => _instance;
 
   static ContainerManagerState get containerManager =>
       _instance.containerManagerKey.currentState;
 
-  static void onPageStart() {
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      singleton.channel.invokeMethod<Map>('pageOnStart').then((Map pageInfo) {
-        if (pageInfo == null || pageInfo.isEmpty) return;
+  final GlobalKey<ContainerManagerState> containerManagerKey =
+      GlobalKey<ContainerManagerState>();
+  final ObserversHolder _observersHolder = ObserversHolder();
+  final BoostChannel _boostChannel = BoostChannel();
 
-        if (pageInfo.containsKey("name") &&
-            pageInfo.containsKey("params") &&
-            pageInfo.containsKey("uniqueId")) {
+  static void onPageStart() {
+    WidgetsBinding.instance.addPostFrameCallback((Duration _) {
+      singleton.channel
+          .invokeMethod<Map<String, dynamic>>('pageOnStart')
+          .then((Map<String, dynamic> pageInfo) {
+        if (pageInfo?.isEmpty ?? true) {
+          return;
+        }
+        if (pageInfo.containsKey('name') &&
+            pageInfo.containsKey('params') &&
+            pageInfo.containsKey('uniqueId')) {
           ContainerCoordinator.singleton.nativeContainerDidShow(
-              pageInfo["name"], pageInfo["params"], pageInfo["uniqueId"]);
+            pageInfo['name'] as String,
+            (pageInfo['params'] as Map<dynamic, dynamic>)
+                ?.cast<String, dynamic>(),
+            pageInfo['uniqueId'] as String,
+          );
         }
       });
     });
   }
 
-  static TransitionBuilder init(
-      {TransitionBuilder builder,
-      PrePushRoute prePush,
-      PostPushRoute postPush}) {
+  static TransitionBuilder init({
+    TransitionBuilder builder,
+    PrePushRoute prePush,
+    PostPushRoute postPush,
+  }) {
     if (Platform.isAndroid) {
       onPageStart();
     } else if (Platform.isIOS) {
+      // TODO(AlexVincent525): 未解之谜
       assert(() {
         () async {
           onPageStart();
@@ -89,10 +109,11 @@ class FlutterBoost {
       assert(child is Navigator, 'child must be Navigator, what is wrong?');
 
       final BoostContainerManager manager = BoostContainerManager(
-          key: _instance.containerManagerKey,
-          initNavigator: child,
-          prePushRoute: prePush,
-          postPushRoute: postPush);
+        key: _instance.containerManagerKey,
+        initNavigator: child as Navigator,
+        prePushRoute: prePush,
+        postPushRoute: postPush,
+      );
 
       if (builder != null) {
         return builder(context, manager);
@@ -106,94 +127,95 @@ class FlutterBoost {
 
   BoostChannel get channel => _boostChannel;
 
-  FlutterBoost() {
-    ContainerCoordinator(_boostChannel);
-  }
-
-  ///Register a default page builder.
+  /// Register a default page builder.
   void registerDefaultPageBuilder(PageBuilder builder) {
     ContainerCoordinator.singleton.registerDefaultPageBuilder(builder);
   }
 
-  ///Register a map builders
+  /// Register a map builders
   void registerPageBuilders(Map<String, PageBuilder> builders) {
     ContainerCoordinator.singleton.registerPageBuilders(builders);
   }
 
-  Future<Map<dynamic, dynamic>> open(String url,
-      {Map<dynamic, dynamic> urlParams, Map<dynamic, dynamic> exts}) {
-    Map<dynamic, dynamic> properties = new Map<dynamic, dynamic>();
-    properties["url"] = url;
-    properties["urlParams"] = urlParams;
-    properties["exts"] = exts;
-    return channel.invokeMethod<Map<dynamic, dynamic>>('openPage', properties);
+  Future<Map<String, dynamic>> open(
+    String url, {
+    Map<String, dynamic> urlParams,
+    Map<String, dynamic> exts,
+  }) {
+    final Map<String, dynamic> properties = <String, dynamic>{};
+    properties['url'] = url;
+    properties['urlParams'] = urlParams;
+    properties['exts'] = exts;
+    return channel.invokeMethod<Map<String, dynamic>>('openPage', properties);
   }
 
-  Future<bool> close(String id,
-      {Map<dynamic, dynamic> result, Map<dynamic, dynamic> exts}) {
+  Future<bool> close(
+    String id, {
+    Map<String, dynamic> result,
+    Map<String, dynamic> exts,
+  }) {
     assert(id != null);
 
-    BoostContainerSettings settings = containerManager?.onstageSettings;
-    Map<dynamic, dynamic> properties = new Map<dynamic, dynamic>();
+    final BoostContainerSettings settings = containerManager?.onstageSettings;
+    final Map<String, dynamic> properties = <String, dynamic>{};
 
-    if (exts == null) {
-      exts = Map<dynamic, dynamic>();
-    }
+    exts ??= <String, dynamic>{};
 
-    exts["params"] = settings.params;
+    exts['params'] = settings.params;
 
-    if (!exts.containsKey("animated")) {
-      exts["animated"] = true;
+    if (!exts.containsKey('animated')) {
+      exts['animated'] = true;
     }
 
-    properties["uniqueId"] = id;
+    properties['uniqueId'] = id;
 
     if (result != null) {
-      properties["result"] = result;
+      properties['result'] = result;
     }
 
     if (exts != null) {
-      properties["exts"] = exts;
+      properties['exts'] = exts;
     }
     return channel.invokeMethod<bool>('closePage', properties);
   }
 
-  Future<bool> closeCurrent(
-      {Map<String, dynamic> result, Map<String, dynamic> exts}) {
-    BoostContainerSettings settings = containerManager?.onstageSettings;
-    if (exts == null) {
-      exts = Map<String, dynamic>();
-    }
-    exts["params"] = settings.params;
-    if (!exts.containsKey("animated")) {
-      exts["animated"] = true;
+  Future<bool> closeCurrent({
+    Map<String, dynamic> result,
+    Map<String, dynamic> exts,
+  }) {
+    final BoostContainerSettings settings = containerManager?.onstageSettings;
+    exts ??= <String, dynamic>{};
+    exts['params'] = settings.params;
+    if (!exts.containsKey('animated')) {
+      exts['animated'] = true;
     }
     return close(settings.uniqueId, result: result, exts: exts);
   }
 
-  Future<bool> closeByContext(BuildContext context,
-      {Map<String, dynamic> result, Map<String, dynamic> exts}) {
-    BoostContainerSettings settings = containerManager?.onstageSettings;
-    if (exts == null) {
-      exts = Map<String, dynamic>();
-    }
-    exts["params"] = settings.params;
-    if (!exts.containsKey("animated")) {
-      exts["animated"] = true;
+  Future<bool> closeByContext(
+    BuildContext context, {
+    Map<String, dynamic> result,
+    Map<String, dynamic> exts,
+  }) {
+    final BoostContainerSettings settings = containerManager?.onstageSettings;
+    exts ??= <String, dynamic>{};
+    exts['params'] = settings.params;
+    if (!exts.containsKey('animated')) {
+      exts['animated'] = true;
     }
     return close(settings.uniqueId, result: result, exts: exts);
   }
 
-  ///register for Container changed callbacks
+  /// Register for Container changed callbacks
   VoidCallback addContainerObserver(BoostContainerObserver observer) =>
       _observersHolder.addObserver<BoostContainerObserver>(observer);
 
-  ///register for Container lifecycle callbacks
+  /// Register for Container lifecycle callbacks
   VoidCallback addBoostContainerLifeCycleObserver(
           BoostContainerLifeCycleObserver observer) =>
       _observersHolder.addObserver<BoostContainerLifeCycleObserver>(observer);
 
-  ///register callbacks for Navigators push & pop
+  /// Register callbacks for [Navigator.push] & [Navigator.pop]
   void addBoostNavigatorObserver(NavigatorObserver observer) =>
       ContainerNavigatorObserver.boostObservers.add(observer);
 }

lib/observers_holders.dart

@@ -24,10 +24,10 @@
 import 'dart:ui';
 
 class ObserversHolder {
-  final Map<String, Set<dynamic>> _observers = Map<String, Set<dynamic>>();
+  final Map<String, Set<dynamic>> _observers = <String, Set<dynamic>>{};
 
   VoidCallback addObserver<T>(T observer) {
-    final Set<T> set = _observers[T.toString()] ?? Set<T>();
+    final Set<T> set = _observers[T.toString()] as Set<T> ?? <T>{};
 
     set.add(observer);
     _observers[T.toString()] = set;
@@ -40,5 +40,5 @@ class ObserversHolder {
 
   void cleanObservers<T>(T observer) => _observers[T.toString()]?.clear();
 
-  Set<T> observersOf<T>() => _observers[T.toString()] ?? Set<T>();
+  Set<T> observersOf<T>() => _observers[T.toString()] as Set<T> ?? <T>{};
 }

lib/support/logger.dart

@@ -27,7 +27,6 @@ class Logger {
       print('FlutterBoost#$msg');
       return true;
     }());
-    //print('FlutterBoost=>$msg');
   }
 
   static void error(String msg) {

pubspec.yaml

@@ -17,42 +17,7 @@ dev_dependencies:
     sdk: flutter
   mockito: 4.1.1
 
-# For information on the generic Dart part of this file, see the
-# following page: https://www.dartlang.org/tools/pub/pubspec
-
-# The following section is specific to Flutter.
 flutter:
   plugin:
     androidPackage: com.idlefish.flutterboost
     pluginClass: FlutterBoostPlugin
-
-  # To add assets to your plugin package, add an assets section, like this:
-  # assets:
-  #  - images/a_dot_burr.jpeg
-  #  - images/a_dot_ham.jpeg
-  #
-  # For details regarding assets in packages, see
-  # https://flutter.io/assets-and-images/#from-packages
-  #
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.io/assets-and-images/#resolution-aware.
-
-  # To add custom fonts to your plugin package, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts in packages, see
-  # https://flutter.io/custom-fonts/#from-packages

test/lib/unit/boost_channel_test.dart

-import 'package:flutter_boost/channel/boost_channel.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_boost/channel/boost_channel.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
@@ -22,13 +23,12 @@ void main() {
     response = null;
 
     test('sendEvent successfully', () async {
-      Map msg1 = Map<dynamic,dynamic>();
-      BoostChannel().sendEvent("name", msg1);
-
-      Map msg = Map<dynamic,dynamic>();
-      msg["name"] = "name";
-      msg["arguments"] = msg1;
+      final Map<String, dynamic> msg1 = <String, dynamic>{};
+      BoostChannel().sendEvent('name', msg1);
 
+      final Map<String, dynamic> msg = <String, dynamic>{};
+      msg['name'] = 'name';
+      msg['arguments'] = msg1;
 
       expect(
         log,
@@ -36,13 +36,10 @@ void main() {
       );
     });
 
-
     test('invokeMethod successfully', () async {
-      Map msg = <dynamic,dynamic>{};
-      msg["test"] = "test";
-      BoostChannel().invokeMethod<dynamic>("__event__1", msg);
-
-//       expect(e, isException);
+      final Map<String, dynamic> msg = <String, dynamic>{};
+      msg['test'] = 'test';
+      BoostChannel().invokeMethod<dynamic>('__event__1', msg);
 
       expect(
         log,
@@ -50,11 +47,10 @@ void main() {
       );
     });
 
-
     test('invokeListMethod successfully', () async {
-      Map msg = <dynamic,dynamic>{};
-      msg["test"] = "test";
-      var bb = await BoostChannel().invokeListMethod<dynamic>("__event__1", msg);
+      final Map<String, dynamic> msg = <String, dynamic>{};
+      msg['test'] = 'test';
+      await BoostChannel().invokeListMethod<dynamic>('__event__1', msg);
 
       expect(
         log,
@@ -62,11 +58,10 @@ void main() {
       );
     });
 
-
     test('invokeMapMethod successfully', () async {
-      Map msg = <dynamic,dynamic>{};
-      msg["test"] = "test";
-      BoostChannel().invokeMapMethod<dynamic,dynamic>("__event__1", msg);
+      final Map<String, dynamic> msg = <String, dynamic>{};
+      msg['test'] = 'test';
+      BoostChannel().invokeMapMethod<dynamic, dynamic>('__event__1', msg);
 
       expect(
         log,
@@ -75,9 +70,9 @@ void main() {
     });
 
     test('invokeMapMethod successfully', () async {
-      Map msg = <dynamic,dynamic>{};
-      msg["test"] = "test";
-      BoostChannel().invokeMapMethod<dynamic,dynamic>("__event__1", msg);
+      final Map<String, dynamic> msg = <String, dynamic>{};
+      msg['test'] = 'test';
+      BoostChannel().invokeMapMethod<dynamic, dynamic>('__event__1', msg);
 
       expect(
         log,
@@ -86,22 +81,24 @@ void main() {
     });
 
     test('addEventListener successfully', () async {
-      Function test = BoostChannel().addEventListener(
-          "addEventListener", (String name, Map arguments) async => "test");
-      print("xxx" + test.toString());
+      final VoidCallback test = BoostChannel().addEventListener(
+        'addEventListener',
+        (String name, Map<String, dynamic> arguments) async => 'test',
+      );
+      print('xxx' + test.toString());
       expect(
         test.toString(),
-        "Closure: () => Null",
+        'Closure: () => Null',
       );
     });
 
-
     test('addMethodHandler successfully', () async {
-      Function test = BoostChannel().addMethodHandler((
-          MethodCall call) async => "test");
+      final VoidCallback test = BoostChannel().addMethodHandler(
+        (MethodCall call) async => 'test',
+      );
       expect(
         test.toString(),
-        "Closure: () => Null",
+        'Closure: () => Null',
       );
     });
   });

test/lib/unit/boost_container_test.dart

 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
-import 'package:flutter_boost/container/boost_container.dart';
+// import 'package:flutter_boost/container/boost_container.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 class FirstWidget extends StatelessWidget {
@@ -149,11 +149,11 @@ void main() {
     );
     await tester.pumpWidget(widget);
 
-    await tester.pump(Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
 
     await tester.tap(find.byKey(targetKey));
 
-    await tester.pump(Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
 
     expect(exception, isInstanceOf<FlutterError>());
     expect('$exception',

test/lib/unit/boost_page_route_test.dart

@@ -49,8 +49,8 @@ void main() {
     testWidgets(
         'obtain BoostPageRoute through the BoostPageRoute.of(context) method',
         (WidgetTester tester) async {
-      dynamic boostPageRoute;
-      dynamic boostPageRouteFindByOfMethod;
+      BoostPageRoute<dynamic> boostPageRoute;
+      BoostPageRoute<dynamic> boostPageRouteFindByOfMethod;
 
       await tester.pumpWidget(
         MaterialApp(
@@ -58,10 +58,11 @@ void main() {
             boostPageRoute = BoostPageRoute<void>(
               settings: settings,
               builder: (BuildContext context) => Builder(
-                builder: (context) {
+                builder: (BuildContext context) {
                   return FloatingActionButton(
                     onPressed: () {
-                      boostPageRouteFindByOfMethod = BoostPageRoute.of<dynamic>(context);
+                      boostPageRouteFindByOfMethod =
+                          BoostPageRoute.of<dynamic>(context);
                     },
                   );
                 },
@@ -74,7 +75,7 @@ void main() {
 
       await tester.tap(find.byType(FloatingActionButton));
 
-      await tester.pump(Duration(seconds: 1));
+      await tester.pump(const Duration(seconds: 1));
 
       // The route obtained from the ancestor node through the `of` method should be the same BoostPageRoute
       // as the originally created BoostPageRoute
@@ -85,15 +86,15 @@ void main() {
         'try to find BoostPageRoute through the BoostPageRoute.of(context) method, '
         'but it doesn\'t exist, the method should throw an Exception',
         (WidgetTester tester) async {
-      dynamic contextCache;
+      BuildContext contextCache;
 
       await tester.pumpWidget(
         MaterialApp(
           onGenerateRoute: (RouteSettings settings) {
             return MaterialPageRoute<dynamic>(
               settings: settings,
-              builder: (context) => Builder(
-                builder: (context) => FloatingActionButton(
+              builder: (BuildContext context) => Builder(
+                builder: (BuildContext context) => FloatingActionButton(
                   onPressed: () {
                     contextCache = context;
                   },
@@ -104,7 +105,7 @@ void main() {
         ),
       );
       await tester.tap(find.byType(FloatingActionButton));
-      await tester.pump(Duration(seconds: 1));
+      await tester.pump(const Duration(seconds: 1));
 
       expect(() => BoostPageRoute.of<dynamic>(contextCache), throwsException);
     });
@@ -112,8 +113,8 @@ void main() {
     testWidgets(
         'obtain BoostPageRoute through the BoostPageRoute.tryOf(context) method',
         (WidgetTester tester) async {
-      dynamic boostPageRoute;
-      dynamic boostPageRouteFindByOfMethod;
+      BoostPageRoute<dynamic> boostPageRoute;
+      BoostPageRoute<dynamic> boostPageRouteFindByOfMethod;
 
       await tester.pumpWidget(
         MaterialApp(
@@ -121,7 +122,7 @@ void main() {
             boostPageRoute = BoostPageRoute<void>(
               settings: settings,
               builder: (BuildContext context) => Builder(
-                builder: (context) {
+                builder: (BuildContext context) {
                   return FloatingActionButton(
                     onPressed: () {
                       boostPageRouteFindByOfMethod =
@@ -137,7 +138,7 @@ void main() {
       );
 
       await tester.tap(find.byType(FloatingActionButton));
-      await tester.pump(Duration(seconds: 1));
+      await tester.pump(const Duration(seconds: 1));
 
       // The route obtained from the ancestor node through the `tryOf` method should be the same BoostPageRoute
       // as the originally created BoostPageRoute
@@ -149,7 +150,7 @@ void main() {
       'try to find BoostPageRoute through the BoostPageRoute.tryOf(context) method, '
       'but it doesn\'t exist, the method should return null',
       (WidgetTester tester) async {
-        dynamic boostPageRouteFindByOfMethod;
+    BoostPageRoute<dynamic> boostPageRouteFindByOfMethod;
 
     await tester.pumpWidget(
       MaterialApp(
@@ -157,7 +158,7 @@ void main() {
           return MaterialPageRoute<dynamic>(
             settings: settings,
             builder: (BuildContext context) => Builder(
-              builder: (context) {
+              builder: (BuildContext context) {
                 return FloatingActionButton(
                   onPressed: () {
                     boostPageRouteFindByOfMethod =
@@ -172,7 +173,7 @@ void main() {
     );
 
     await tester.tap(find.byType(FloatingActionButton));
-    await tester.pump(Duration(seconds: 1));
+    await tester.pump(const Duration(seconds: 1));
 
     expect(boostPageRouteFindByOfMethod, null);
   });

test/lib/unit/container_coordinator_test.dart

@@ -6,9 +6,6 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/mockito.dart';
 import 'package:flutter_boost/channel/boost_channel.dart';
 import 'package:flutter_boost/container/container_coordinator.dart';
-import 'package:flutter_boost/flutter_boost.dart';
-
-import 'dart:typed_data';
 
 class MockBoostChannel extends BoostChannel implements Mock {
   MethodHandler get testHandler => _testHandler;
@@ -17,40 +14,42 @@ class MockBoostChannel extends BoostChannel implements Mock {
   MethodHandler _testHandler;
   EventListener _testEventListener;
 
+  @override
   VoidCallback addEventListener(String name, EventListener listener) {
     _testEventListener = listener;
 
     return super.addEventListener(name, listener);
   }
 
+  @override
   VoidCallback addMethodHandler(MethodHandler handler) {
     _testHandler = handler;
-    return  super.addMethodHandler(handler);
+    return super.addMethodHandler(handler);
   }
 }
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-  const MessageCodec<dynamic> jsonMessage = JSONMessageCodec();
+//  const MessageCodec<dynamic> jsonMessage = JSONMessageCodec();
 
   test('test onMethodCall', () async {
     // Initialize all bindings because defaultBinaryMessenger.send() needs a window.
     TestWidgetsFlutterBinding.ensureInitialized();
-    MockBoostChannel boostChannel = MockBoostChannel();
+    final MockBoostChannel boostChannel = MockBoostChannel();
     ContainerCoordinator(boostChannel);
 
-    final Map arguments =<dynamic,dynamic> {};
-    arguments["pageName"] = "pageName";
-    arguments["params"] = <dynamic,dynamic>{};
-    arguments["uniqueId"] = "xxxxx";
+    final Map<String, dynamic> arguments = <String, dynamic>{};
+    arguments['pageName'] = 'pageName';
+    arguments['params'] = <dynamic, dynamic>{};
+    arguments['uniqueId'] = 'xxxxx';
 
-    MethodCall call = MethodCall('didInitPageContainer', arguments);
+    final MethodCall call = MethodCall('didInitPageContainer', arguments);
     try {
       boostChannel.testHandler(call);
     } catch (e) {
       expect(e, isAssertionError);
     }
-    MethodCall call2 = MethodCall('willShowPageContainer', arguments);
+    final MethodCall call2 = MethodCall('willShowPageContainer', arguments);
 
     try {
       boostChannel.testHandler(call2);
@@ -58,7 +57,7 @@ void main() {
       expect(e, isNoSuchMethodError);
     }
 
-    MethodCall call3 = MethodCall('didShowPageContainer', arguments);
+    final MethodCall call3 = MethodCall('didShowPageContainer', arguments);
 
     try {
       boostChannel.testHandler(call3);
@@ -66,7 +65,8 @@ void main() {
       expect(e, isNoSuchMethodError);
     }
 
-    MethodCall call4 = MethodCall('willDisappearPageContainer', arguments);
+    final MethodCall call4 =
+        MethodCall('willDisappearPageContainer', arguments);
 
     try {
       boostChannel.testHandler(call4);
@@ -74,7 +74,7 @@ void main() {
       expect(e, isNoSuchMethodError);
     }
 
-    MethodCall call5 = MethodCall('onNativePageResult', arguments);
+    final MethodCall call5 = MethodCall('onNativePageResult', arguments);
 
     try {
       boostChannel.testHandler(call5);
@@ -82,14 +82,14 @@ void main() {
       expect(e, isNoSuchMethodError);
     }
 
-    MethodCall call6 = MethodCall('didDisappearPageContainer', arguments);
+    final MethodCall call6 = MethodCall('didDisappearPageContainer', arguments);
 
     try {
       boostChannel.testHandler(call6);
     } catch (e) {
       expect(e, isNoSuchMethodError);
     }
-    MethodCall call7 = MethodCall('willDeallocPageContainer', arguments);
+    final MethodCall call7 = MethodCall('willDeallocPageContainer', arguments);
 
     try {
       boostChannel.testHandler(call7);
@@ -97,35 +97,36 @@ void main() {
       expect(e, isNoSuchMethodError);
     }
 
-    Map arg = <dynamic,dynamic>{'type': 'backPressedCallback'};
+    final Map<String, dynamic> arg = <String, dynamic>{
+      'type': 'backPressedCallback'
+    };
     try {
-      boostChannel.testEventListener("lifecycle", arg);
+      boostChannel.testEventListener('lifecycle', arg);
     } catch (e) {
       expect(e, isNoSuchMethodError);
     }
 
-
-
-    Map arg2 = <dynamic,dynamic>{'type': 'foreground'};
+    final Map<String, dynamic> arg2 = <String, dynamic>{'type': 'foreground'};
     try {
-      boostChannel.testEventListener("lifecycle", arg2);
+      boostChannel.testEventListener('lifecycle', arg2);
     } catch (e) {
       expect(e, isNoSuchMethodError);
     }
 
-    Map arg3 = <dynamic,dynamic>{'type': 'background'};
+    final Map<String, dynamic> arg3 = <String, dynamic>{'type': 'background'};
     try {
-      boostChannel.testEventListener("lifecycle", arg3);
+      boostChannel.testEventListener('lifecycle', arg3);
     } catch (e) {
       expect(e, isNoSuchMethodError);
     }
 
-    Map arg4 = <dynamic,dynamic>{'type': 'scheduleFrame'};
+    final Map<String, dynamic> arg4 = <String, dynamic>{
+      'type': 'scheduleFrame'
+    };
     try {
-      boostChannel.testEventListener("lifecycle", arg4);
+      boostChannel.testEventListener('lifecycle', arg4);
     } catch (e) {
       expect(e, isNoSuchMethodError);
     }
   });
-
 }

test/lib/unit/container_manager_test.dart

@@ -12,19 +12,21 @@ class FirstRouteWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('First Route'),
+        title: const Text('First Route'),
       ),
       body: Center(
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
             RaisedButton(
-              child: Text('First'),
+              child: const Text('First'),
               onPressed: () {
-                print("open second page!");
-                FlutterBoost.singleton.open("second").then((Map value) {
+                print('open second page!');
+                FlutterBoost.singleton
+                    .open('second')
+                    .then((Map<String, dynamic> value) {
                   print(
-                      "call me when page is finished. did recieve second route result $value");
+                      'call me when page is finished. did recieve second route result $value');
                 });
               },
             ),
@@ -40,19 +42,21 @@ class SecondRouteWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('Second Route'),
+        title: const Text('Second Route'),
       ),
       body: Center(
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
             RaisedButton(
-              child: Text('Second'),
+              child: const Text('Second'),
               onPressed: () {
-                print("open second page!");
-                FlutterBoost.singleton.open("second").then((Map value) {
+                print('open second page!');
+                FlutterBoost.singleton
+                    .open('second')
+                    .then((Map<String, dynamic> value) {
                   print(
-                      "call me when page is finished. did recieve second route result $value");
+                      'call me when page is finished. did recieve second route result $value');
                 });
               },
             ),
@@ -73,9 +77,11 @@ class _MyAppState extends State<MyApp> {
   void initState() {
     super.initState();
 
-    FlutterBoost.singleton.registerPageBuilders({
-      'first': (pageName, params, _) => FirstRouteWidget(),
-      'second': (pageName, params, _) => SecondRouteWidget(),
+    FlutterBoost.singleton.registerPageBuilders(<String, PageBuilder>{
+      'first': (String pageName, Map<String, dynamic> params, String _) =>
+          FirstRouteWidget(),
+      'second': (String pageName, Map<String, dynamic> params, String _) =>
+          SecondRouteWidget(),
     });
   }
 
@@ -88,7 +94,7 @@ class _MyAppState extends State<MyApp> {
           assert(child is Navigator, 'child must be Navigator, what is wrong?');
 
           final BoostContainerManager manager = BoostContainerManager(
-            initNavigator: child,
+            initNavigator: child as Navigator,
           );
 
           return manager;
@@ -113,19 +119,23 @@ void main() {
       testWidgets(
         'through the `BoostContainerManager.of(context)` method',
         (WidgetTester tester) async {
-          var builderContext;
-
-          FlutterBoost.singleton.registerPageBuilders({
-            'context': (pageName, params, _) => Builder(
-                  builder: (context) {
-                    return FloatingActionButton(
-                      onPressed: () {
-                        builderContext = context;
-                      },
-                    );
-                  },
-                ),
-          });
+          BuildContext builderContext;
+
+          FlutterBoost.singleton.registerPageBuilders(
+            <String, PageBuilder>{
+              'context':
+                  (String pageName, Map<String, dynamic> params, String _) =>
+                      Builder(
+                        builder: (BuildContext context) {
+                          return FloatingActionButton(
+                            onPressed: () {
+                              builderContext = context;
+                            },
+                          );
+                        },
+                      ),
+            },
+          );
 
           await tester.pumpWidget(
             MaterialApp(
@@ -135,28 +145,34 @@ void main() {
           );
 
           //open context page
-          ContainerCoordinator.singleton
-              .nativeContainerDidShow("context", {}, "1000000");
+          ContainerCoordinator.singleton.nativeContainerDidShow(
+            'context',
+            <String, dynamic>{},
+            '1000000',
+          );
 
-          await tester.pump(Duration(seconds: 1));
+          await tester.pump(const Duration(seconds: 1));
 
           expect(find.byType(FloatingActionButton), findsOneWidget);
 
           //get the context of the Builder
           await tester.tap(find.byType(FloatingActionButton));
 
-          final isFind = BoostContainerManager.of(builderContext) != null;
+          final bool isFind = BoostContainerManager.of(builderContext) != null;
 
-          expect(isFind, true,
-              reason: '`BoostContainerManager.of` should be able to '
-                  'find `ContainerManagerState` in `FlutterBoost.init()` based on the context of the `Builder`');
+          expect(
+            isFind,
+            true,
+            reason: '`BoostContainerManager.of` should be able to '
+                'find `ContainerManagerState` in `FlutterBoost.init()` based on the context of the `Builder`',
+          );
         },
       );
 
 //      testWidgets(
 //        'through the `BoostContainerManager.of(context)` method',
 //        (WidgetTester tester) async {
-//          var builderContext;
+//          BuildContext builderContext;
 //
 //          await tester.pumpWidget(
 //            MaterialApp(
@@ -184,19 +200,22 @@ void main() {
       testWidgets(
         'through the `BoostContainerManager.tryOf(context)` method',
         (WidgetTester tester) async {
-          var builderContext;
-
-          FlutterBoost.singleton.registerPageBuilders({
-            'context': (pageName, params, _) => Builder(
-                  builder: (context) {
-                    return FloatingActionButton(
-                      onPressed: () {
-                        builderContext = context;
-                      },
-                    );
-                  },
-                ),
-          });
+          BuildContext builderContext;
+
+          FlutterBoost.singleton.registerPageBuilders(
+            <String, PageBuilder>{
+              'context': (String pageName, Map<String, dynamic> params, _) =>
+                  Builder(
+                    builder: (BuildContext context) {
+                      return FloatingActionButton(
+                        onPressed: () {
+                          builderContext = context;
+                        },
+                      );
+                    },
+                  ),
+            },
+          );
 
           await tester.pumpWidget(
             MaterialApp(
@@ -206,21 +225,25 @@ void main() {
           );
 
           //open context page
-          ContainerCoordinator.singleton
-              .nativeContainerDidShow("context", {}, "1000000");
+          ContainerCoordinator.singleton.nativeContainerDidShow(
+              'context', <String, dynamic>{}, '1000000');
 
-          await tester.pump(Duration(seconds: 1));
+          await tester.pump(const Duration(seconds: 1));
 
           expect(find.byType(FloatingActionButton), findsOneWidget);
 
           //get the context of the Builder
           await tester.tap(find.byType(FloatingActionButton));
 
-          final isFind = BoostContainerManager.tryOf(builderContext) != null;
+          final bool isFind =
+              BoostContainerManager.tryOf(builderContext) != null;
 
-          expect(isFind, true,
-              reason: '`BoostContainerManager.tryOf` should be able to '
-                  'find `ContainerManagerState` in `FlutterBoost.init()` based on the context of the `Builder`');
+          expect(
+            isFind,
+            true,
+            reason: '`BoostContainerManager.tryOf` should be able to '
+                'find `ContainerManagerState` in `FlutterBoost.init()` based on the context of the `Builder`',
+          );
         },
       );
     },
@@ -230,19 +253,22 @@ void main() {
     testWidgets(
       'containerCounts should change based on the number of pages',
       (WidgetTester tester) async {
-        var builderContext;
-
-        FlutterBoost.singleton.registerPageBuilders({
-          'context': (pageName, params, _) => Builder(
-                builder: (context) {
-                  return FloatingActionButton(
-                    onPressed: () {
-                      builderContext = context;
-                    },
-                  );
-                },
-              ),
-        });
+        BuildContext builderContext;
+
+        FlutterBoost.singleton.registerPageBuilders(
+          <String, PageBuilder>{
+            'context': (String pageName, Map<String, dynamic> params, _) =>
+                Builder(
+                  builder: (BuildContext context) {
+                    return FloatingActionButton(
+                      onPressed: () {
+                        builderContext = context;
+                      },
+                    );
+                  },
+                ),
+          },
+        );
 
         await tester.pumpWidget(
           MaterialApp(
@@ -253,23 +279,24 @@ void main() {
 
         //open first context page
         ContainerCoordinator.singleton
-            .nativeContainerDidShow("context", {}, "1000000");
+            .nativeContainerDidShow('context', <String, dynamic>{}, '1000000');
 
-        await tester.pump(Duration(seconds: 1));
+        await tester.pump(const Duration(seconds: 1));
 
         //get the context of the Builder
         await tester.tap(find.byType(FloatingActionButton));
 
-        final containerManagerState = BoostContainerManager.of(builderContext);
+        final ContainerManagerState containerManagerState =
+            BoostContainerManager.of(builderContext);
 
         expect(containerManagerState.containerCounts, 1,
             reason: '1 page shown');
 
         //open second context page
         ContainerCoordinator.singleton
-            .nativeContainerDidShow("context", {}, "2000000");
+            .nativeContainerDidShow('context', <String, dynamic>{}, '2000000');
 
-        await tester.pump(Duration(seconds: 1));
+        await tester.pump(const Duration(seconds: 1));
 
         expect(containerManagerState.containerCounts, 2,
             reason: '2 page shown');
@@ -277,7 +304,7 @@ void main() {
         //pop second context page
         containerManagerState.pop();
 
-        await tester.pump(Duration(seconds: 1));
+        await tester.pump(const Duration(seconds: 1));
 
         expect(containerManagerState.containerCounts, 1,
             reason: 'second context page closed, Only one page left');
@@ -285,7 +312,7 @@ void main() {
         //pop last context page
         containerManagerState.pop();
 
-        await tester.pump(Duration(seconds: 1));
+        await tester.pump(const Duration(seconds: 1));
 
         expect(containerManagerState.containerCounts, 0,
             reason: 'last context page closed, no page left');

test/lib/unit/flutter_boost_test.dart

-import 'package:flutter_boost/container/container_manager.dart';
-
 import 'package:flutter/widgets.dart';
 import 'package:flutter_boost/flutter_boost.dart';
+import 'package:flutter_boost/container/container_manager.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
 
+  test('test onMethodCall', () async {
+    FlutterBoost.singleton.registerDefaultPageBuilder(
+        (String pageName, Map<String, dynamic> params, String _) =>
+            Container());
+    FlutterBoost.singleton.addContainerObserver(
+      (ContainerOperation operation, BoostContainerSettings settings) {},
+    );
+
+    FlutterBoost.singleton.addBoostContainerLifeCycleObserver(
+      (ContainerLifeCycle state, BoostContainerSettings settings) {},
+    );
+
+    FlutterBoost.singleton.addBoostNavigatorObserver(NavigatorObserver());
+
+    try {
+      FlutterBoost.singleton.open('url');
+    } catch (e) {
+      expect(e, isException);
+    }
+    try {
+      FlutterBoost.singleton.close('url');
+    } catch (e) {
+      expect(e, isNoSuchMethodError);
+    }
+    try {
+      FlutterBoost.singleton.closeCurrent(
+        result: <String, dynamic>{},
+        exts: <String, dynamic>{},
+      );
+    } catch (e) {
+      expect(e, isNoSuchMethodError);
+    }
 
-//  test('test onMethodCall', () async {
-//    FlutterBoost.singleton
-//        .registerDefaultPageBuilder((pageName, params, _) => Container());
-//    FlutterBoost.singleton.addContainerObserver(
-//        (ContainerOperation operation, BoostContainerSettings settings) {});
-//
-//    FlutterBoost.singleton.addBoostContainerLifeCycleObserver(
-//        (ContainerLifeCycle state, BoostContainerSettings settings) {});
-//
-//    FlutterBoost.singleton.addBoostNavigatorObserver(NavigatorObserver());
-//
-//    try {
-//      FlutterBoost.singleton.open("url");
-//    } catch (e) {
-//      expect(e, isException);
-//    }
-//    try {
-//      FlutterBoost.singleton.close("url");
-//    } catch (e) {
-//      expect(e, isNoSuchMethodError);
-//    }
-//    try {
-//      FlutterBoost.singleton.closeCurrent(result: <String,dynamic>{}, exts: <String,dynamic>{});
-//    } catch (e) {
-//      expect(e, isNoSuchMethodError);
-//    }
-//
-//    try {
-//      FlutterBoost.singleton.closeByContext(null, result: <String,dynamic>{}, exts: <String,dynamic>{});
-//    } catch (e) {
-//      expect(e, isNoSuchMethodError);
-//    }
-//  });
+    try {
+      FlutterBoost.singleton.closeByContext(
+        null,
+        result: <String, dynamic>{},
+        exts: <String, dynamic>{},
+      );
+    } catch (e) {
+      expect(e, isNoSuchMethodError);
+    }
+  });
 }

test/lib/unit/page_widget_test.dart

 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 import 'package:flutter_boost/flutter_boost.dart';
+import 'package:flutter_boost/container/container_coordinator.dart';
 import 'package:flutter_test/flutter_test.dart';
+
 import 'page_widgets.dart';
-import 'package:flutter_boost/container/container_coordinator.dart';
 
 class MyApp extends StatefulWidget {
   @override
@@ -15,14 +16,19 @@ class _MyAppState extends State<MyApp> {
   void initState() {
     super.initState();
 
-    FlutterBoost.singleton.registerPageBuilders({
-      'embeded': (pageName, params, _) => EmbededFirstRouteWidget(),
-      'first': (pageName, params, _) => FirstRouteWidget(),
-      'second': (pageName, params, _) => SecondRouteWidget(),
-      'tab': (pageName, params, _) => TabRouteWidget(),
-      'flutterFragment': (pageName, params, _) => FragmentRouteWidget(params),
-      'flutterPage': (pageName, params, _) {
-        print("flutterPage params:$params");
+    FlutterBoost.singleton.registerPageBuilders(<String, PageBuilder>{
+      'embeded': (String pageName, Map<String, dynamic> params, _) =>
+          EmbededFirstRouteWidget(),
+      'first': (String pageName, Map<String, dynamic> params, _) =>
+          FirstRouteWidget(),
+      'second': (String pageName, Map<String, dynamic> params, _) =>
+          SecondRouteWidget(),
+      'tab': (String pageName, Map<String, dynamic> params, _) =>
+          TabRouteWidget(),
+      'flutterFragment': (String pageName, Map<String, dynamic> params, _) =>
+          FragmentRouteWidget(params),
+      'flutterPage': (String pageName, Map<String, dynamic> params, _) {
+        print('flutterPage params:$params');
 
         return FlutterRouteWidget(params: params);
       },
@@ -40,24 +46,33 @@ class _MyAppState extends State<MyApp> {
   }
 
   void _onRoutePushed(
-      String pageName, String uniqueId, Map params, Route route, Future _) {}
+    String pageName,
+    String uniqueId,
+    Map<String, dynamic> params,
+    Route<dynamic> route,
+    Future<dynamic> _,
+  ) {}
 }
 
 class TestBoostNavigatorObserver extends NavigatorObserver {
+  @override
   void didPush(Route<dynamic> route, Route<dynamic> previousRoute) {
-    print("flutterboost#didPush");
+    print('flutterboost#didPush');
   }
 
+  @override
   void didPop(Route<dynamic> route, Route<dynamic> previousRoute) {
-    print("flutterboost#didPop");
+    print('flutterboost#didPop');
   }
 
+  @override
   void didRemove(Route<dynamic> route, Route<dynamic> previousRoute) {
-    print("flutterboost#didRemove");
+    print('flutterboost#didRemove');
   }
 
+  @override
   void didReplace({Route<dynamic> newRoute, Route<dynamic> oldRoute}) {
-    print("flutterboost#didReplace");
+    print('flutterboost#didReplace');
   }
 }
 
@@ -72,7 +87,7 @@ void main() {
     );
     //open firt page
     ContainerCoordinator.singleton
-        .nativeContainerDidShow("first", <dynamic,dynamic>{}, "1000000");
+        .nativeContainerDidShow('first', <String, dynamic>{}, '1000000');
 
     await tester.pump(const Duration(seconds: 1));
 
@@ -80,7 +95,7 @@ void main() {
 
     //open second page  firt(1000000)->second(2000000)
     ContainerCoordinator.singleton
-        .nativeContainerDidShow("second", <dynamic,dynamic>{}, "2000000");
+        .nativeContainerDidShow('second', <String, dynamic>{}, '2000000');
 
     await tester.pump(const Duration(seconds: 1));
 
@@ -89,7 +104,7 @@ void main() {
     await tester.pump(const Duration(seconds: 1));
 
     //close sencod page  firt(1000000)
-    FlutterBoost.containerManager?.remove("2000000");
+    FlutterBoost.containerManager?.remove('2000000');
 
     await tester.pump(const Duration(seconds: 1));
 
@@ -97,7 +112,7 @@ void main() {
 
     // second page ,but pageId is 2000001    firt(1000000)->second(2000001)
     ContainerCoordinator.singleton
-        .nativeContainerDidShow("second", <dynamic,dynamic>{}, "2000001");
+        .nativeContainerDidShow('second', <String, dynamic>{}, '2000001');
 
     await tester.pump(const Duration(seconds: 1));
 
@@ -107,7 +122,7 @@ void main() {
 
     //reopen firt page   second(2000001)->firt(1000000)
     ContainerCoordinator.singleton
-        .nativeContainerDidShow("first",<dynamic,dynamic> {}, "1000000");
+        .nativeContainerDidShow('first', <String, dynamic>{}, '1000000');
 
     await tester.pump(const Duration(seconds: 1));
 
@@ -117,7 +132,7 @@ void main() {
 
     // reopen second page and  pageId is 2000001    firt(1000000)->second(2000001)
     ContainerCoordinator.singleton
-        .nativeContainerDidShow("second", <dynamic,dynamic>{}, "2000001");
+        .nativeContainerDidShow('second', <String, dynamic>{}, '2000001');
 
     await tester.pump(const Duration(seconds: 1));
 
@@ -126,24 +141,18 @@ void main() {
     await tester.pump(const Duration(seconds: 1));
 
     //close firt(1000000) page  second(2000001)
-    FlutterBoost.containerManager?.remove("1000000");
+    FlutterBoost.containerManager?.remove('1000000');
 
     await tester.pump(const Duration(seconds: 1));
 
     expect(find.text('Second'), findsOneWidget);
 
-
     // open  second(2000003)
     ContainerCoordinator.singleton
-        .nativeContainerDidShow("second", <dynamic,dynamic>{}, "2000003");
+        .nativeContainerDidShow('second', <String, dynamic>{}, '2000003');
 
     await tester.idle();
 
     expect(find.text('Second'), findsOneWidget);
-
-
-
-
-
   });
 }

test/lib/unit/page_widgets.dart

@@ -7,36 +7,38 @@ class FirstRouteWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('First Route'),
+        title: const Text('First Route'),
       ),
       body: Center(
-        child:
-        Column(
+        child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
-          children: 
-          <Widget>[
+          children: <Widget>[
             RaisedButton(
-                child: Text('First'),
-                onPressed: () {
-                  print("open second page!");
-                  FlutterBoost.singleton.open("second").then((Map value) {
-                    print(
-                        "call me when page is finished. did recieve second route result $value");
-                  });
-                },
-              ),
-
-              RaisedButton(
-                  child: Text('Present second route'),
-                  onPressed: () {
-                    print("Present second page!");
-                    FlutterBoost.singleton.open("second",urlParams:<dynamic,dynamic>{"present":true}).then((Map value) {
-                      print(
-                          "call me when page is finished. did recieve second route result $value");
-                    });
-                  },
-                ),
-            ],
+              child: const Text('First'),
+              onPressed: () {
+                print('open second page!');
+                FlutterBoost.singleton
+                    .open('second')
+                    .then((Map<String, dynamic> value) {
+                  print(
+                      'call me when page is finished. did recieve second route result $value');
+                });
+              },
+            ),
+            RaisedButton(
+              child: const Text('Present second route'),
+              onPressed: () {
+                print('Present second page!');
+                FlutterBoost.singleton.open('second',
+                    urlParams: <String, dynamic>{
+                      'present': true
+                    }).then((Map<String, dynamic> value) {
+                  print(
+                      'call me when page is finished. did recieve second route result $value');
+                });
+              },
+            ),
+          ],
         ),
       ),
     );
@@ -49,12 +51,14 @@ class EmbededFirstRouteWidget extends StatelessWidget {
     return Scaffold(
       body: Center(
         child: RaisedButton(
-          child: Text('Open second route'),
+          child: const Text('Open second route'),
           onPressed: () {
-            print("open second page!");
-            FlutterBoost.singleton.open("second").then((Map value) {
+            print('open second page!');
+            FlutterBoost.singleton
+                .open('second')
+                .then((Map<String, dynamic> value) {
               print(
-                  "call me when page is finished. did recieve second route result $value");
+                  'call me when page is finished. did recieve second route result $value');
             });
           },
         ),
@@ -68,19 +72,19 @@ class SecondRouteWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("Second"),
+        title: const Text('Second'),
       ),
       body: Center(
         child: RaisedButton(
           onPressed: () {
             // Navigate back to first route when tapped.
 
-            BoostContainerSettings settings =
+            final BoostContainerSettings settings =
                 BoostContainer.of(context).settings;
             FlutterBoost.singleton.close(settings.uniqueId,
-                result:<dynamic,dynamic>{"result": "data from second"});
+                result: <String, dynamic>{'result': 'data from second'});
           },
-          child: Text('Go back with result!'),
+          child: const Text('Go back with result!'),
         ),
       ),
     );
@@ -92,14 +96,14 @@ class TabRouteWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("Tab Route"),
+        title: const Text('Tab Route'),
       ),
       body: Center(
         child: RaisedButton(
           onPressed: () {
-            FlutterBoost.singleton.open("second");
+            FlutterBoost.singleton.open('second');
           },
-          child: Text('Open second route'),
+          child: const Text('Open second route'),
         ),
       ),
     );
@@ -107,8 +111,9 @@ class TabRouteWidget extends StatelessWidget {
 }
 
 class FlutterRouteWidget extends StatefulWidget {
-  FlutterRouteWidget({this.params,this.message});
-  final Map params;
+  const FlutterRouteWidget({this.params, this.message});
+
+  final Map<String, dynamic> params;
   final String message;
 
   @override
@@ -116,176 +121,190 @@ class FlutterRouteWidget extends StatefulWidget {
 }
 
 class _FlutterRouteWidgetState extends State<FlutterRouteWidget> {
-  final TextEditingController _usernameController = TextEditingController();
-
   @override
   Widget build(BuildContext context) {
-    final String message=widget.message;
+    final String message = widget.message;
     return Scaffold(
       appBar: AppBar(
-        brightness:Brightness.light,
+        brightness: Brightness.light,
         backgroundColor: Colors.white,
-        textTheme:new TextTheme(title: TextStyle(color: Colors.black)) ,
-
-        title: Text('flutter_boost_example'),
+        textTheme: TextTheme(title: TextStyle(color: Colors.black)),
+        title: const Text('flutter_boost_example'),
       ),
       body: SingleChildScrollView(
-        child:Container(
-            margin: const EdgeInsets.all(24.0),
-            child: Column(
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: <Widget>[
-                Container(
-                  margin: const EdgeInsets.only(top: 10.0,bottom: 20.0),
-                  child: Text(
-                    message ?? "This is a flutter activity \n params:${widget.params}",
-                    style: TextStyle(fontSize: 28.0, color: Colors.blue),
-                  ),
-                  alignment: AlignmentDirectional.center,
+        child: Container(
+          margin: const EdgeInsets.all(24.0),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: <Widget>[
+              Container(
+                margin: const EdgeInsets.only(top: 10.0, bottom: 20.0),
+                child: Text(
+                  message ??
+                      'This is a flutter activity \n params:${widget.params}',
+                  style: TextStyle(fontSize: 28.0, color: Colors.blue),
                 ),
-//                Expanded(child: Container()),
-                const CupertinoTextField(
-                  prefix: Icon(
-                    CupertinoIcons.person_solid,
-                    color: CupertinoColors.lightBackgroundGray,
-                    size: 28.0,
+                alignment: AlignmentDirectional.center,
+              ),
+              const CupertinoTextField(
+                prefix: Icon(
+                  CupertinoIcons.person_solid,
+                  color: CupertinoColors.lightBackgroundGray,
+                  size: 28.0,
+                ),
+                padding: EdgeInsets.symmetric(horizontal: 6.0, vertical: 12.0),
+                clearButtonMode: OverlayVisibilityMode.editing,
+                textCapitalization: TextCapitalization.words,
+                autocorrect: false,
+                decoration: BoxDecoration(
+                  border: Border(
+                    bottom: BorderSide(
+                        width: 0.0, color: CupertinoColors.inactiveGray),
                   ),
-                  padding: EdgeInsets.symmetric(horizontal: 6.0, vertical: 12.0),
-                  clearButtonMode: OverlayVisibilityMode.editing,
-                  textCapitalization: TextCapitalization.words,
-                  autocorrect: false,
-                  decoration: BoxDecoration(
-                    border: Border(bottom: BorderSide(width: 0.0, color: CupertinoColors.inactiveGray)),
+                ),
+                placeholder: 'Name',
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: Text(
+                    'open native page',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
                   ),
-                  placeholder: 'Name',
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open native page',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
 
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("sample://nativePage", urlParams: <dynamic,dynamic>{
-                    "query": {"aaa": "bbb"}
-                  }),
+                ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                ///例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'sample://nativePage',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'},
+                  },
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open first',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("first", urlParams: <dynamic,dynamic>{
-                    "query": {"aaa": "bbb"}
-                  }),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: Text(
+                    'open first',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open second',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
 
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("second", urlParams: <dynamic,dynamic>{
-                    "query": {"aaa": "bbb"}
-                  }),
+                ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                ///例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'first',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'},
+                  },
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open tab',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("tab", urlParams: <dynamic,dynamic>{
-                    "query": {"aaa": "bbb"}
-                  }),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: Text(
+                    'open second',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open flutter page',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
 
-                  ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
-                  ///例如：sample://nativePage?aaa=bbb
-                  onTap: () => FlutterBoost.singleton
-                      .open("sample://flutterPage", urlParams:<dynamic,dynamic> {
-                    "query": {"aaa": "bbb"}
-                  }),
+                ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                ///例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'second',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'},
+                  },
+                ),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: Text(
+                    'open tab',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
                 ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'push flutter widget',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-                  onTap: () {
-                    Navigator.push<dynamic>(context,
-                        MaterialPageRoute<dynamic>(builder: (_) => PushWidget()));
+
+                ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                ///例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'tab',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'}
                   },
                 ),
+              ),
+              InkWell(
+                child: Container(
+                  padding: const EdgeInsets.all(8.0),
+                  margin: const EdgeInsets.all(8.0),
+                  color: Colors.yellow,
+                  child: Text(
+                    'open flutter page',
+                    style: TextStyle(fontSize: 22.0, color: Colors.black),
+                  ),
+                ),
 
+                ///后面的参数会在native的IPlatform.startActivity方法回调中拼接到url的query部分。
+                ///例如：sample://nativePage?aaa=bbb
+                onTap: () => FlutterBoost.singleton.open(
+                  'sample://flutterPage',
+                  urlParams: <String, dynamic>{
+                    'query': <String, dynamic>{'aaa': 'bbb'}
+                  },
+                ),
+              ),
               InkWell(
                 child: Container(
                     padding: const EdgeInsets.all(8.0),
                     margin: const EdgeInsets.all(8.0),
                     color: Colors.yellow,
                     child: Text(
-                      'push Platform demo',
+                      'push flutter widget',
                       style: TextStyle(fontSize: 22.0, color: Colors.black),
                     )),
                 onTap: () {
+                  Navigator.push<dynamic>(
+                    context,
+                    MaterialPageRoute<dynamic>(builder: (_) => PushWidget()),
+                  );
                 },
               ),
-                InkWell(
-                  child: Container(
-                      padding: const EdgeInsets.all(8.0),
-                      margin: const EdgeInsets.all(8.0),
-                      color: Colors.yellow,
-                      child: Text(
-                        'open flutter fragment page',
-                        style: TextStyle(fontSize: 22.0, color: Colors.black),
-                      )),
-                  onTap: () => FlutterBoost.singleton
-                      .open("sample://flutterFragmentPage"),
-                ),
-              ],
-            ),
-
+              InkWell(
+                child: Container(
+                    padding: const EdgeInsets.all(8.0),
+                    margin: const EdgeInsets.all(8.0),
+                    color: Colors.yellow,
+                    child: Text(
+                      'push Platform demo',
+                      style: TextStyle(fontSize: 22.0, color: Colors.black),
+                    )),
+                onTap: () {},
+              ),
+              InkWell(
+                child: Container(
+                    padding: const EdgeInsets.all(8.0),
+                    margin: const EdgeInsets.all(8.0),
+                    color: Colors.yellow,
+                    child: Text(
+                      'open flutter fragment page',
+                      style: TextStyle(fontSize: 22.0, color: Colors.black),
+                    )),
+                onTap: () =>
+                    FlutterBoost.singleton.open('sample://flutterFragmentPage'),
+              ),
+            ],
+          ),
         ),
       ),
     );
@@ -293,15 +312,15 @@ class _FlutterRouteWidgetState extends State<FlutterRouteWidget> {
 }
 
 class FragmentRouteWidget extends StatelessWidget {
-  final Map params;
+  const FragmentRouteWidget(this.params);
 
-  FragmentRouteWidget(this.params);
+  final Map<String, dynamic> params;
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('flutter_boost_example'),
+        title: const Text('flutter_boost_example'),
       ),
       body: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -309,7 +328,7 @@ class FragmentRouteWidget extends StatelessWidget {
           Container(
             margin: const EdgeInsets.only(top: 80.0),
             child: Text(
-              "This is a flutter fragment",
+              'This is a flutter fragment',
               style: TextStyle(fontSize: 28.0, color: Colors.blue),
             ),
             alignment: AlignmentDirectional.center,
@@ -317,7 +336,7 @@ class FragmentRouteWidget extends StatelessWidget {
           Container(
             margin: const EdgeInsets.only(top: 32.0),
             child: Text(
-              params['tag'] ?? '',
+              '${params['tag']}' ?? '',
               style: TextStyle(fontSize: 28.0, color: Colors.red),
             ),
             alignment: AlignmentDirectional.center,
@@ -332,7 +351,7 @@ class FragmentRouteWidget extends StatelessWidget {
                   'open native page',
                   style: TextStyle(fontSize: 22.0, color: Colors.black),
                 )),
-            onTap: () => FlutterBoost.singleton.open("sample://nativePage"),
+            onTap: () => FlutterBoost.singleton.open('sample://nativePage'),
           ),
           InkWell(
             child: Container(
@@ -343,7 +362,7 @@ class FragmentRouteWidget extends StatelessWidget {
                   'open flutter page',
                   style: TextStyle(fontSize: 22.0, color: Colors.black),
                 )),
-            onTap: () => FlutterBoost.singleton.open("sample://flutterPage"),
+            onTap: () => FlutterBoost.singleton.open('sample://flutterPage'),
           ),
           InkWell(
             child: Container(
@@ -355,7 +374,7 @@ class FragmentRouteWidget extends StatelessWidget {
                   style: TextStyle(fontSize: 22.0, color: Colors.black),
                 )),
             onTap: () =>
-                FlutterBoost.singleton.open("sample://flutterFragmentPage"),
+                FlutterBoost.singleton.open('sample://flutterFragmentPage'),
           )
         ],
       ),
@@ -373,13 +392,13 @@ class _PushWidgetState extends State<PushWidget> {
 
   @override
   void initState() {
-    // TODO: implement initState
+    // TODO(unknown): implement initState
     super.initState();
   }
 
   @override
   void didChangeDependencies() {
-    // TODO: implement didChangeDependencies
+    // TODO(unknown): implement didChangeDependencies
     super.didChangeDependencies();
 
 //    if (_backPressedListenerUnsub == null) {
@@ -395,13 +414,13 @@ class _PushWidgetState extends State<PushWidget> {
 
   @override
   void dispose() {
-    // TODO: implement dispose
+    // TODO(unknown): implement dispose
     super.dispose();
     _backPressedListenerUnsub?.call();
   }
 
   @override
   Widget build(BuildContext context) {
-    return FlutterRouteWidget(message: "Pushed Widget");
+    return const FlutterRouteWidget(message: 'Pushed Widget');
   }
 }