code refactoring, added InAppBrowserManager and ChromeSafariBrowserManager...

code refactoring, added InAppBrowserManager and ChromeSafariBrowserManager classes on native code, updated webview options class names

README.md

@@ -81,7 +81,7 @@ See the online [API Reference](https://pub.dartlang.org/documentation/flutter_in
 
 The API showed in this `README.md` file shows only a part of the documentation that conforms to the master branch only. 
 So, here you could have methods, options, and events that aren't published yet.
-If you need a specific version, change the **GitHub branch** to your version or use the **online API Reference** (recommended).  
+If you need a specific version, change the **GitHub branch** to your version or use the **online API Reference** (recommended).
 
 ### Load a file inside `assets` folder
 
@@ -530,8 +530,7 @@ class MyInAppBrowser extends InAppBrowser {
   @override
   Future<ShouldOverrideUrlLoadingAction> shouldOverrideUrlLoading(ShouldOverrideUrlLoadingRequest shouldOverrideUrlLoadingRequest) async {
     print("\n\n override ${shouldOverrideUrlLoadingRequest.url}\n\n");
-    this.webViewController.loadUrl(url: shouldOverrideUrlLoadingRequest.url);
-    return ShouldOverrideUrlLoadingAction.CANCEL;
+    return ShouldOverrideUrlLoadingAction.ALLOW;
   }
 
   @override

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/ChromeCustomTabs/ChromeCustomTabsActivity.java

@@ -5,7 +5,6 @@ import android.content.Intent;
 import android.graphics.Color;
 import android.net.Uri;
 import android.os.Bundle;
-import android.util.Log;
 
 import androidx.browser.customtabs.CustomTabsCallback;
 import androidx.browser.customtabs.CustomTabsIntent;
@@ -14,16 +13,21 @@ import androidx.browser.customtabs.CustomTabsSession;
 
 import com.pichillilorenzo.flutter_inappwebview.InAppWebViewFlutterPlugin;
 import com.pichillilorenzo.flutter_inappwebview.R;
+import com.pichillilorenzo.flutter_inappwebview.Shared;
 
 import java.util.HashMap;
 import java.util.Map;
 
-public class ChromeCustomTabsActivity extends Activity {
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+
+public class ChromeCustomTabsActivity extends Activity implements MethodChannel.MethodCallHandler {
 
   protected static final String LOG_TAG = "CustomTabsActivity";
-  String uuid;
-  CustomTabsIntent.Builder builder;
-  ChromeCustomTabsOptions options;
+  public MethodChannel channel;
+  public String uuid;
+  private CustomTabsIntent.Builder builder;
+  private ChromeCustomTabsOptions options;
   private CustomTabActivityHelper customTabActivityHelper;
   private CustomTabsSession customTabsSession;
   private final int CHROME_CUSTOM_TAB_REQUEST_CODE = 100;
@@ -39,13 +43,15 @@ public class ChromeCustomTabsActivity extends Activity {
     Bundle b = getIntent().getExtras();
     assert b != null;
     uuid = b.getString("uuid");
+
+    channel = new MethodChannel(Shared.messenger, "com.pichillilorenzo/flutter_chromesafaribrowser_" + uuid);
+    channel.setMethodCallHandler(this);
+
     final String url = b.getString("url");
 
     options = new ChromeCustomTabsOptions();
     options.parse((HashMap<String, Object>) b.getSerializable("options"));
 
-    InAppWebViewFlutterPlugin.inAppBrowser.chromeCustomTabsActivities.put(uuid, this);
-
     final ChromeCustomTabsActivity chromeCustomTabsActivity = this;
 
     customTabActivityHelper = new CustomTabActivityHelper();
@@ -68,7 +74,7 @@ public class ChromeCustomTabsActivity extends Activity {
         finish();
         Map<String, Object> obj = new HashMap<>();
         obj.put("uuid", uuid);
-        InAppWebViewFlutterPlugin.inAppBrowser.channel.invokeMethod("onChromeSafariBrowserClosed", obj);
+        channel.invokeMethod("onChromeSafariBrowserClosed", obj);
       }
     });
 
@@ -79,14 +85,14 @@ public class ChromeCustomTabsActivity extends Activity {
           onChromeSafariBrowserOpened = true;
           Map<String, Object> obj = new HashMap<>();
           obj.put("uuid", uuid);
-          InAppWebViewFlutterPlugin.inAppBrowser.channel.invokeMethod("onChromeSafariBrowserOpened", obj);
+          channel.invokeMethod("onChromeSafariBrowserOpened", obj);
         }
 
         if (navigationEvent == NAVIGATION_FINISHED && !onChromeSafariBrowserCompletedInitialLoad) {
           onChromeSafariBrowserCompletedInitialLoad = true;
           Map<String, Object> obj = new HashMap<>();
           obj.put("uuid", uuid);
-          InAppWebViewFlutterPlugin.inAppBrowser.channel.invokeMethod("onChromeSafariBrowserCompletedInitialLoad", obj);
+          channel.invokeMethod("onChromeSafariBrowserCompletedInitialLoad", obj);
         }
       }
 
@@ -113,6 +119,14 @@ public class ChromeCustomTabsActivity extends Activity {
     });
   }
 
+  @Override
+  public void onMethodCall(final MethodCall call, final MethodChannel.Result result) {
+    switch (call.method) {
+      default:
+        result.notImplemented();
+    }
+  }
+
   private void prepareCustomTabs(CustomTabsIntent customTabsIntent) {
     if (options.addDefaultShareMenuItem)
       builder.addDefaultShareMenuItem();
@@ -155,7 +169,7 @@ public class ChromeCustomTabsActivity extends Activity {
       finish();
       Map<String, Object> obj = new HashMap<>();
       obj.put("uuid", uuid);
-      InAppWebViewFlutterPlugin.inAppBrowser.channel.invokeMethod("onChromeSafariBrowserClosed", obj);
+      InAppWebViewFlutterPlugin.inAppBrowserManager.channel.invokeMethod("onChromeSafariBrowserClosed", obj);
     }
   }
 

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/ChromeSafariBrowserManager.java

+package com.pichillilorenzo.flutter_inappwebview;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+
+import com.pichillilorenzo.flutter_inappwebview.ChromeCustomTabs.ChromeCustomTabsActivity;
+import com.pichillilorenzo.flutter_inappwebview.ChromeCustomTabs.CustomTabActivityHelper;
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+
+import io.flutter.plugin.common.BinaryMessenger;
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+
+public class ChromeSafariBrowserManager implements MethodChannel.MethodCallHandler {
+
+  public MethodChannel channel;
+
+  protected static final String LOG_TAG = "ChromeBrowserManager";
+
+  public ChromeSafariBrowserManager(BinaryMessenger messenger) {
+    channel = new MethodChannel(messenger, "com.pichillilorenzo/flutter_chromesafaribrowser");
+    channel.setMethodCallHandler(this);
+  }
+
+  @Override
+  public void onMethodCall(final MethodCall call, final MethodChannel.Result result) {
+    final Activity activity = Shared.activity;
+    final String uuid = (String) call.argument("uuid");
+
+    switch (call.method) {
+      case "open":
+        {
+          String url = (String) call.argument("url");
+          HashMap<String, Object> options = (HashMap<String, Object>) call.argument("options");
+          String uuidFallback = (String) call.argument("uuidFallback");
+          Map<String, String> headersFallback = (Map<String, String>) call.argument("headersFallback");
+          HashMap<String, Object> optionsFallback = (HashMap<String, Object>) call.argument("optionsFallback");
+          open(activity, uuid, url, options, uuidFallback, headersFallback, optionsFallback, result);
+        }
+        break;
+      default:
+        result.notImplemented();
+    }
+  }
+
+  public void open(Activity activity, String uuid, String url, HashMap<String, Object> options, String uuidFallback, Map<String, String> headersFallback, HashMap<String, Object> optionsFallback, MethodChannel.Result result) {
+
+    Intent intent = null;
+    Bundle extras = new Bundle();
+    extras.putString("fromActivity", activity.getClass().getName());
+    extras.putString("url", url);
+    extras.putBoolean("isData", false);
+    extras.putString("uuid", uuid);
+    extras.putSerializable("options", options);
+    extras.putSerializable("headers", (Serializable) headersFallback);
+
+    if (CustomTabActivityHelper.isAvailable(activity)) {
+      intent = new Intent(activity, ChromeCustomTabsActivity.class);
+    }
+    // check for webview fallback
+    else if (!CustomTabActivityHelper.isAvailable(activity) && !uuidFallback.isEmpty()) {
+      Log.d(LOG_TAG, "WebView fallback declared.");
+      // overwrite with extras fallback parameters
+      extras.putString("uuid", uuidFallback);
+      if (optionsFallback != null)
+        extras.putSerializable("options", optionsFallback);
+      else
+        extras.putSerializable("options", (new InAppBrowserOptions()).getHashMap());
+      intent = new Intent(activity, InAppBrowserActivity.class);
+    }
+
+    if (intent != null) {
+      intent.putExtras(extras);
+      activity.startActivity(intent);
+      result.success(true);
+      return;
+    }
+
+    result.error(LOG_TAG, "No WebView fallback declared.", null);
+  }
+
+  public void dispose() {
+    channel.setMethodCallHandler(null);
+  }
+}

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/FlutterWebView.java

@@ -38,6 +38,9 @@ public class FlutterWebView implements PlatformView, MethodCallHandler  {
   public final MethodChannel channel;
 
   public FlutterWebView(BinaryMessenger messenger, final Context context, int id, HashMap<String, Object> params, View containerView) {
+    channel = new MethodChannel(messenger, "com.pichillilorenzo/flutter_inappwebview_" + id);
+    channel.setMethodCallHandler(this);
+
     DisplayListenerProxy displayListenerProxy = new DisplayListenerProxy();
     DisplayManager displayManager = (DisplayManager) context.getSystemService(Context.DISPLAY_SERVICE);
     displayListenerProxy.onPreWebViewInitialization(displayManager);
@@ -70,9 +73,6 @@ public class FlutterWebView implements PlatformView, MethodCallHandler  {
 
     webView.prepare();
 
-    channel = new MethodChannel(messenger, "com.pichillilorenzo/flutter_inappwebview_" + id);
-    channel.setMethodCallHandler(this);
-
     if (initialFile != null) {
       try {
         initialUrl = Util.getUrlAsset(initialFile);

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppBrowserManager.java

+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+package com.pichillilorenzo.flutter_inappwebview;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.os.Parcelable;
+import android.provider.Browser;
+import android.net.Uri;
+import android.os.Bundle;
+import android.webkit.MimeTypeMap;
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import io.flutter.plugin.common.BinaryMessenger;
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+import io.flutter.plugin.common.MethodChannel.Result;
+
+/**
+ * InAppBrowserManager
+ */
+public class InAppBrowserManager implements MethodChannel.MethodCallHandler {
+
+  public MethodChannel channel;
+  protected static final String LOG_TAG = "InAppBrowserManager";
+
+  public InAppBrowserManager(BinaryMessenger messenger) {
+    channel = new MethodChannel(messenger, "com.pichillilorenzo/flutter_inappbrowser");
+    channel.setMethodCallHandler(this);
+  }
+
+  @Override
+  public void onMethodCall(final MethodCall call, final Result result) {
+    final Activity activity = Shared.activity;
+    final String uuid = (String) call.argument("uuid");
+
+    switch (call.method) {
+      case "openUrl":
+        {
+          String url = (String) call.argument("url");
+          HashMap<String, Object> options = (HashMap<String, Object>) call.argument("options");
+          Map<String, String> headers = (Map<String, String>) call.argument("headers");
+          openUrl(activity, uuid, url, options, headers);
+        }
+        result.success(true);
+        break;
+      case "openFile":
+        {
+          String url = (String) call.argument("url");
+          try {
+            url = Util.getUrlAsset(url);
+          } catch (IOException e) {
+            e.printStackTrace();
+            result.error(LOG_TAG, url + " asset file cannot be found!", e);
+            return;
+          }
+          HashMap<String, Object> options = (HashMap<String, Object>) call.argument("options");
+          Map<String, String> headers = (Map<String, String>) call.argument("headers");
+          openUrl(activity, uuid, url, options, headers);
+        }
+        result.success(true);
+        break;
+      case "openData":
+        {
+          HashMap<String, Object> options = (HashMap<String, Object>) call.argument("options");
+          String data = (String) call.argument("data");
+          String mimeType = (String) call.argument("mimeType");
+          String encoding = (String) call.argument("encoding");
+          String baseUrl = (String) call.argument("baseUrl");
+          String historyUrl = (String) call.argument("historyUrl");
+          openData(activity, uuid, options, data, mimeType, encoding, baseUrl, historyUrl);
+        }
+        result.success(true);
+        break;
+      case "openWithSystemBrowser":
+        {
+          String url = (String) call.argument("url");
+          openWithSystemBrowser(activity, url, result);
+        }
+        break;
+      default:
+        result.notImplemented();
+    }
+
+  }
+
+  public static String getMimeType(String url) {
+    String type = null;
+    String extension = MimeTypeMap.getFileExtensionFromUrl(url);
+    if (extension != null) {
+      type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
+    }
+    return type;
+  }
+
+  /**
+   * Display a new browser with the specified URL.
+   *
+   * @param url the url to load.
+   * @param result
+   * @return "" if ok, or error message.
+   */
+  public void openWithSystemBrowser(Activity activity, String url, Result result) {
+    try {
+      Intent intent;
+      intent = new Intent(Intent.ACTION_VIEW);
+      // Omitting the MIME type for file: URLs causes "No Activity found to handle Intent".
+      // Adding the MIME type to http: URLs causes them to not be handled by the downloader.
+      Uri uri = Uri.parse(url);
+      if ("file".equals(uri.getScheme())) {
+        intent.setDataAndType(uri, getMimeType(url));
+      } else {
+        intent.setData(uri);
+      }
+      intent.putExtra(Browser.EXTRA_APPLICATION_ID, activity.getPackageName());
+      // CB-10795: Avoid circular loops by preventing it from opening in the current app
+      this.openExternalExcludeCurrentApp(activity, intent);
+      result.success(true);
+      // not catching FileUriExposedException explicitly because buildtools<24 doesn't know about it
+    } catch (java.lang.RuntimeException e) {
+      Log.d(LOG_TAG, url + " cannot be opened: " + e.toString());
+      result.error(LOG_TAG, url + " cannot be opened!", null);
+    }
+  }
+
+  /**
+   * Opens the intent, providing a chooser that excludes the current app to avoid
+   * circular loops.
+   */
+  public void openExternalExcludeCurrentApp(Activity activity, Intent intent) {
+    String currentPackage = activity.getPackageName();
+    boolean hasCurrentPackage = false;
+    PackageManager pm = activity.getPackageManager();
+    List<ResolveInfo> activities = pm.queryIntentActivities(intent, 0);
+    ArrayList<Intent> targetIntents = new ArrayList<Intent>();
+    for (ResolveInfo ri : activities) {
+      if (!currentPackage.equals(ri.activityInfo.packageName)) {
+        Intent targetIntent = (Intent) intent.clone();
+        targetIntent.setPackage(ri.activityInfo.packageName);
+        targetIntents.add(targetIntent);
+      } else {
+        hasCurrentPackage = true;
+      }
+    }
+    // If the current app package isn't a target for this URL, then use
+    // the normal launch behavior
+    if (!hasCurrentPackage || targetIntents.size() == 0) {
+      activity.startActivity(intent);
+    }
+    // If there's only one possible intent, launch it directly
+    else if (targetIntents.size() == 1) {
+      activity.startActivity(targetIntents.get(0));
+    }
+    // Otherwise, show a custom chooser without the current app listed
+    else if (targetIntents.size() > 0) {
+      Intent chooser = Intent.createChooser(targetIntents.remove(targetIntents.size() - 1), null);
+      chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetIntents.toArray(new Parcelable[]{}));
+      activity.startActivity(chooser);
+    }
+  }
+
+  public void openUrl(Activity activity, String uuid, String url, HashMap<String, Object> options, Map<String, String> headers) {
+    Bundle extras = new Bundle();
+    extras.putString("fromActivity", activity.getClass().getName());
+    extras.putString("url", url);
+    extras.putBoolean("isData", false);
+    extras.putString("uuid", uuid);
+    extras.putSerializable("options", options);
+    extras.putSerializable("headers", (Serializable) headers);
+    startInAppBrowserActivity(activity, extras);
+  }
+
+  public void openData(Activity activity, String uuid, HashMap<String, Object> options, String data, String mimeType, String encoding, String baseUrl, String historyUrl) {
+    Bundle extras = new Bundle();
+    extras.putBoolean("isData", true);
+    extras.putString("uuid", uuid);
+    extras.putSerializable("options", options);
+    extras.putString("data", data);
+    extras.putString("mimeType", mimeType);
+    extras.putString("encoding", encoding);
+    extras.putString("baseUrl", baseUrl);
+    extras.putString("historyUrl", historyUrl);
+    startInAppBrowserActivity(activity, extras);
+  }
+
+  public void startInAppBrowserActivity(Activity activity, Bundle extras) {
+    Intent intent = new Intent(activity, InAppBrowserActivity.class);
+    if (extras != null)
+      intent.putExtras(extras);
+    activity.startActivity(intent);
+  }
+
+  public void dispose() {
+    channel.setMethodCallHandler(null);
+  }
+}

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebView/InAppWebView.java

 package com.pichillilorenzo.flutter_inappwebview.InAppWebView;
 
-import android.app.Activity;
 import android.content.Context;
-import android.content.DialogInterface;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
@@ -21,13 +19,8 @@ import android.webkit.WebBackForwardList;
 import android.webkit.WebHistoryItem;
 import android.webkit.WebSettings;
 import android.webkit.WebStorage;
-import android.widget.AdapterView;
-import android.widget.ArrayAdapter;
-import android.widget.FrameLayout;
-import android.widget.ListView;
 
 import androidx.annotation.RequiresApi;
-import androidx.appcompat.app.AlertDialog;
 
 import com.pichillilorenzo.flutter_inappwebview.ContentBlocker.ContentBlocker;
 import com.pichillilorenzo.flutter_inappwebview.ContentBlocker.ContentBlockerAction;
@@ -37,7 +30,6 @@ import com.pichillilorenzo.flutter_inappwebview.FlutterWebView;
 import com.pichillilorenzo.flutter_inappwebview.InAppBrowserActivity;
 import com.pichillilorenzo.flutter_inappwebview.InAppWebViewFlutterPlugin;
 import com.pichillilorenzo.flutter_inappwebview.JavaScriptBridgeInterface;
-import com.pichillilorenzo.flutter_inappwebview.R;
 import com.pichillilorenzo.flutter_inappwebview.Shared;
 import com.pichillilorenzo.flutter_inappwebview.Util;
 
@@ -50,7 +42,6 @@ import java.util.Map;
 import java.util.regex.Pattern;
 
 import io.flutter.plugin.common.MethodChannel;
-import io.flutter.plugin.common.PluginRegistry;
 import okhttp3.OkHttpClient;
 
 import static com.pichillilorenzo.flutter_inappwebview.InAppWebView.PreferredContentModeOptionType.fromValue;
@@ -61,6 +52,7 @@ final public class InAppWebView extends InputAwareWebView {
 
   public InAppBrowserActivity inAppBrowserActivity;
   public FlutterWebView flutterWebView;
+  public MethodChannel channel;
   public int id;
   public InAppWebViewClient inAppWebViewClient;
   public InAppWebViewChromeClient inAppWebViewChromeClient;
@@ -123,7 +115,7 @@ final public class InAppWebView extends InputAwareWebView {
 
   static final String interceptAjaxRequestsJS = "(function(ajax) {" +
           "  var send = ajax.prototype.send;" +
-          "  var open = ajax.prototype.open;" +
+          "  var openUrl = ajax.prototype.openUrl;" +
           "  var setRequestHeader = ajax.prototype.setRequestHeader;" +
           "  ajax.prototype._flutter_inappwebview_url = null;" +
           "  ajax.prototype._flutter_inappwebview_method = null;" +
@@ -156,7 +148,7 @@ final public class InAppWebView extends InputAwareWebView {
           "    }" +
           "    callback(null);" +
           "  };" +
-          "  ajax.prototype.open = function(method, url, isAsync, user, password) {" +
+          "  ajax.prototype.openUrl = function(method, url, isAsync, user, password) {" +
           "    isAsync = (isAsync != null) ? isAsync : true;" +
           "    this._flutter_inappwebview_url = url;" +
           "    this._flutter_inappwebview_method = method;" +
@@ -164,7 +156,7 @@ final public class InAppWebView extends InputAwareWebView {
           "    this._flutter_inappwebview_user = user;" +
           "    this._flutter_inappwebview_password = password;" +
           "    this._flutter_inappwebview_request_headers = {};" +
-          "    open.call(this, method, url, isAsync, user, password);" +
+          "    openUrl.call(this, method, url, isAsync, user, password);" +
           "  };" +
           "  ajax.prototype.setRequestHeader = function(header, value) {" +
           "    this._flutter_inappwebview_request_headers[header] = value;" +
@@ -319,7 +311,7 @@ final public class InAppWebView extends InputAwareWebView {
           "          };" +
           "          if ((self._flutter_inappwebview_method != result.method && result.method != null) || (self._flutter_inappwebview_url != result.url && result.url != null)) {" +
           "            self.abort();" +
-          "            self.open(result.method, result.url, result.isAsync, result.user, result.password);" +
+          "            self.openUrl(result.method, result.url, result.isAsync, result.user, result.password);" +
           "            return;" +
           "          }" +
           "        }" +
@@ -532,6 +524,7 @@ final public class InAppWebView extends InputAwareWebView {
       this.inAppBrowserActivity = (InAppBrowserActivity) obj;
     else if (obj instanceof FlutterWebView)
       this.flutterWebView = (FlutterWebView) obj;
+    this.channel = (this.inAppBrowserActivity != null) ? this.inAppBrowserActivity.channel : this.flutterWebView.channel;
     this.id = id;
     this.options = options;
   }
@@ -689,7 +682,7 @@ final public class InAppWebView extends InputAwareWebView {
         obj.put("activeMatchOrdinal", activeMatchOrdinal);
         obj.put("numberOfMatches", numberOfMatches);
         obj.put("isDoneCounting", isDoneCounting);
-        getChannel().invokeMethod("onFindResultReceived", obj);
+        channel.invokeMethod("onFindResultReceived", obj);
       }
     });
 
@@ -1264,11 +1257,7 @@ final public class InAppWebView extends InputAwareWebView {
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("x", x);
     obj.put("y", y);
-    getChannel().invokeMethod("onScrollChanged", obj);
-  }
-
-  private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppWebViewFlutterPlugin.inAppBrowser.channel : flutterWebView.channel;
+    channel.invokeMethod("onScrollChanged", obj);
   }
 
   public void startSafeBrowsing(final MethodChannel.Result result) {
@@ -1304,7 +1293,7 @@ final public class InAppWebView extends InputAwareWebView {
       if (inAppBrowserActivity != null)
         obj.put("uuid", inAppBrowserActivity.uuid);
       obj.put("url", url);
-      getChannel().invokeMethod("onDownloadStart", obj);
+      channel.invokeMethod("onDownloadStart", obj);
     }
   }
 

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebView/InAppWebViewChromeClient.java

@@ -2,7 +2,6 @@ package com.pichillilorenzo.flutter_inappwebview.InAppWebView;
 
 import android.annotation.TargetApi;
 import android.content.ActivityNotFoundException;
-import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.graphics.Bitmap;
@@ -33,7 +32,6 @@ import com.pichillilorenzo.flutter_inappwebview.InAppBrowserActivity;
 import com.pichillilorenzo.flutter_inappwebview.InAppWebViewFlutterPlugin;
 import com.pichillilorenzo.flutter_inappwebview.R;
 import com.pichillilorenzo.flutter_inappwebview.Shared;
-import com.pichillilorenzo.flutter_inappwebview.Util;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -52,6 +50,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
   protected static final String LOG_TAG = "IABWebChromeClient";
   private FlutterWebView flutterWebView;
   private InAppBrowserActivity inAppBrowserActivity;
+  public MethodChannel channel;
   private ValueCallback<Uri> mUploadMessage;
   private final static int FILECHOOSER_RESULTCODE = 1;
 
@@ -65,6 +64,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       this.inAppBrowserActivity = (InAppBrowserActivity) obj;
     else if (obj instanceof FlutterWebView)
       this.flutterWebView = (FlutterWebView) obj;
+    this.channel = (this.inAppBrowserActivity != null) ? this.inAppBrowserActivity.channel : this.flutterWebView.channel;
 
     if (Shared.registrar != null)
       Shared.registrar.addActivityResultListener(this);
@@ -121,7 +121,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("message", message);
 
-    getChannel().invokeMethod("onJsAlert", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onJsAlert", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         String responseMessage = null;
@@ -204,7 +204,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("message", message);
 
-    getChannel().invokeMethod("onJsConfirm", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onJsConfirm", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         String responseMessage = null;
@@ -301,7 +301,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
     obj.put("message", message);
     obj.put("defaultValue", defaultValue);
 
-    getChannel().invokeMethod("onJsPrompt", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onJsPrompt", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         String responseMessage = null;
@@ -433,7 +433,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
           super.onPageStarted(v, url, favicon);
 
           obj.put("url", url);
-          getChannel().invokeMethod("onCreateWindow", obj);
+          channel.invokeMethod("onCreateWindow", obj);
 
           // stop webview loading
           v.stopLoading();
@@ -449,7 +449,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
     }
 
     obj.put("url", data);
-    getChannel().invokeMethod("onCreateWindow", obj);
+    channel.invokeMethod("onCreateWindow", obj);
     return false;
   }
 
@@ -459,7 +459,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
     if (inAppBrowserActivity != null)
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("origin", origin);
-    getChannel().invokeMethod("onGeolocationPermissionsShowPrompt", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onGeolocationPermissionsShowPrompt", obj, new MethodChannel.Result() {
       @Override
       public void success(Object o) {
         Map<String, Object> response = (Map<String, Object>) o;
@@ -486,7 +486,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
     Map<String, Object> obj = new HashMap<>();
     if (inAppBrowserActivity != null)
       obj.put("uuid", inAppBrowserActivity.uuid);
-    getChannel().invokeMethod("onGeolocationPermissionsHidePrompt", obj);
+    channel.invokeMethod("onGeolocationPermissionsHidePrompt", obj);
   }
 
   @Override
@@ -496,7 +496,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("message", consoleMessage.message());
     obj.put("messageLevel", consoleMessage.messageLevel().ordinal());
-    getChannel().invokeMethod("onConsoleMessage", obj);
+    channel.invokeMethod("onConsoleMessage", obj);
     return true;
   }
 
@@ -518,7 +518,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
     if (inAppBrowserActivity != null)
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("progress", progress);
-    getChannel().invokeMethod("onProgressChanged", obj);
+    channel.invokeMethod("onProgressChanged", obj);
 
     super.onProgressChanged(view, progress);
   }
@@ -608,7 +608,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
         obj.put("uuid", inAppBrowserActivity.uuid);
       obj.put("origin", request.getOrigin().toString());
       obj.put("resources", Arrays.asList(request.getResources()));
-      getChannel().invokeMethod("onPermissionRequest", obj, new MethodChannel.Result() {
+      channel.invokeMethod("onPermissionRequest", obj, new MethodChannel.Result() {
         @Override
         public void success(Object response) {
           if (response != null) {
@@ -646,8 +646,4 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       });
     }
   }
-
-  private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppWebViewFlutterPlugin.inAppBrowser.channel : flutterWebView.channel;
-  }
 }

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebView/InAppWebViewClient.java

@@ -17,7 +17,6 @@ import android.webkit.SslErrorHandler;
 import android.webkit.ValueCallback;
 import android.webkit.WebResourceRequest;
 import android.webkit.WebResourceResponse;
-import android.webkit.WebStorage;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
@@ -53,6 +52,7 @@ public class InAppWebViewClient extends WebViewClient {
   protected static final String LOG_TAG = "IABWebViewClient";
   private FlutterWebView flutterWebView;
   private InAppBrowserActivity inAppBrowserActivity;
+  public MethodChannel channel;
   private static int previousAuthRequestFailureCount = 0;
   private static List<Credential> credentialsProposed = null;
 
@@ -62,6 +62,7 @@ public class InAppWebViewClient extends WebViewClient {
       this.inAppBrowserActivity = (InAppBrowserActivity) obj;
     else if (obj instanceof FlutterWebView)
       this.flutterWebView = (FlutterWebView) obj;
+    this.channel = (this.inAppBrowserActivity != null) ? this.inAppBrowserActivity.channel : this.flutterWebView.channel;
   }
 
   @TargetApi(Build.VERSION_CODES.LOLLIPOP)
@@ -125,7 +126,7 @@ public class InAppWebViewClient extends WebViewClient {
     obj.put("androidHasGesture", hasGesture);
     obj.put("androidIsRedirect", isRedirect);
     obj.put("iosWKNavigationType", null);
-    getChannel().invokeMethod("shouldOverrideUrlLoading", obj, new MethodChannel.Result() {
+    channel.invokeMethod("shouldOverrideUrlLoading", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         if (response != null) {
@@ -199,7 +200,7 @@ public class InAppWebViewClient extends WebViewClient {
     if (inAppBrowserActivity != null)
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("url", url);
-    getChannel().invokeMethod("onLoadStart", obj);
+    channel.invokeMethod("onLoadStart", obj);
   }
 
 
@@ -212,7 +213,7 @@ public class InAppWebViewClient extends WebViewClient {
     previousAuthRequestFailureCount = 0;
     credentialsProposed = null;
 
-    // CB-10395 InAppBrowser's WebView not storing cookies reliable to local device storage
+    // CB-10395 InAppBrowserManager's WebView not storing cookies reliable to local device storage
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
       CookieManager.getInstance().flush();
     } else {
@@ -235,7 +236,7 @@ public class InAppWebViewClient extends WebViewClient {
     if (inAppBrowserActivity != null)
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("url", url);
-    getChannel().invokeMethod("onLoadStop", obj);
+    channel.invokeMethod("onLoadStop", obj);
   }
 
   @Override
@@ -245,7 +246,7 @@ public class InAppWebViewClient extends WebViewClient {
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("url", url);
     obj.put("androidIsReload", isReload);
-    getChannel().invokeMethod("onUpdateVisitedHistory", obj);
+    channel.invokeMethod("onUpdateVisitedHistory", obj);
 
     super.doUpdateVisitedHistory(view, url, isReload);
   }
@@ -264,7 +265,7 @@ public class InAppWebViewClient extends WebViewClient {
     obj.put("url", failingUrl);
     obj.put("code", errorCode);
     obj.put("message", description);
-    getChannel().invokeMethod("onLoadError", obj);
+    channel.invokeMethod("onLoadError", obj);
   }
 
   @RequiresApi(api = Build.VERSION_CODES.M)
@@ -278,7 +279,7 @@ public class InAppWebViewClient extends WebViewClient {
       obj.put("url", request.getUrl().toString());
       obj.put("statusCode", errorResponse.getStatusCode());
       obj.put("description", errorResponse.getReasonPhrase());
-      getChannel().invokeMethod("onLoadHttpError", obj);
+      channel.invokeMethod("onLoadHttpError", obj);
     }
   }
 
@@ -316,7 +317,7 @@ public class InAppWebViewClient extends WebViewClient {
     obj.put("port", port);
     obj.put("previousFailureCount", previousAuthRequestFailureCount);
 
-    getChannel().invokeMethod("onReceivedHttpAuthRequest", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onReceivedHttpAuthRequest", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         if (response != null) {
@@ -461,7 +462,7 @@ public class InAppWebViewClient extends WebViewClient {
 
     Log.d(LOG_TAG, obj.toString());
 
-    getChannel().invokeMethod("onReceivedServerTrustAuthRequest", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onReceivedServerTrustAuthRequest", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         if (response != null) {
@@ -520,7 +521,7 @@ public class InAppWebViewClient extends WebViewClient {
     obj.put("realm", realm);
     obj.put("port", request.getPort());
 
-    getChannel().invokeMethod("onReceivedClientCertRequest", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onReceivedClientCertRequest", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         if (response != null) {
@@ -579,7 +580,7 @@ public class InAppWebViewClient extends WebViewClient {
     obj.put("url", request.getUrl().toString());
     obj.put("threatType", threatType);
 
-    getChannel().invokeMethod("onSafeBrowsingHit", obj, new MethodChannel.Result() {
+    channel.invokeMethod("onSafeBrowsingHit", obj, new MethodChannel.Result() {
       @Override
       public void success(Object response) {
         if (response != null) {
@@ -652,7 +653,7 @@ public class InAppWebViewClient extends WebViewClient {
 
       Util.WaitFlutterResult flutterResult;
       try {
-        flutterResult = Util.invokeMethodAndWait(getChannel(), "onLoadResourceCustomScheme", obj);
+        flutterResult = Util.invokeMethodAndWait(channel, "onLoadResourceCustomScheme", obj);
       } catch (InterruptedException e) {
         e.printStackTrace();
         Log.e(LOG_TAG, e.getMessage());
@@ -701,9 +702,4 @@ public class InAppWebViewClient extends WebViewClient {
   public void onUnhandledKeyEvent(WebView view, KeyEvent event) {
 
   }
-
-  private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppWebViewFlutterPlugin.inAppBrowser.channel : flutterWebView.channel;
-  }
-
 }

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/InAppWebViewFlutterPlugin.java

@@ -4,7 +4,6 @@ import android.app.Activity;
 import android.content.Context;
 import android.net.Uri;
 import android.os.Build;
-import android.util.Log;
 import android.webkit.ValueCallback;
 
 import io.flutter.embedding.engine.plugins.activity.ActivityAware;
@@ -19,7 +18,8 @@ public class InAppWebViewFlutterPlugin implements FlutterPlugin, ActivityAware {
 
   protected static final String LOG_TAG = "InAppWebViewFlutterPL";
 
-  public static InAppBrowser inAppBrowser;
+  public static InAppBrowserManager inAppBrowserManager;
+  public static ChromeSafariBrowserManager chromeSafariBrowserManager;
   public static InAppWebViewStatic inAppWebViewStatic;
   public static MyCookieManager myCookieManager;
   public static CredentialDatabaseHandler credentialDatabaseHandler;
@@ -46,8 +46,10 @@ public class InAppWebViewFlutterPlugin implements FlutterPlugin, ActivityAware {
   private void onAttachedToEngine(Context applicationContext, BinaryMessenger messenger, Activity activity, PlatformViewRegistry platformViewRegistry, FlutterView flutterView) {
     Shared.applicationContext = applicationContext;
     Shared.activity = activity;
+    Shared.messenger = messenger;
 
-    inAppBrowser = new InAppBrowser(messenger);
+    inAppBrowserManager = new InAppBrowserManager(messenger);
+    chromeSafariBrowserManager = new ChromeSafariBrowserManager(messenger);
 
     platformViewRegistry.registerViewFactory(
                     "com.pichillilorenzo/flutter_inappwebview", new FlutterWebViewFactory(messenger, flutterView));
@@ -61,9 +63,13 @@ public class InAppWebViewFlutterPlugin implements FlutterPlugin, ActivityAware {
 
   @Override
   public void onDetachedFromEngine(FlutterPluginBinding binding) {
-    if (inAppBrowser != null) {
-      inAppBrowser.dispose();
-      inAppBrowser = null;
+    if (inAppBrowserManager != null) {
+      inAppBrowserManager.dispose();
+      inAppBrowserManager = null;
+    }
+    if (chromeSafariBrowserManager != null) {
+      chromeSafariBrowserManager.dispose();
+      chromeSafariBrowserManager = null;
     }
     if (myCookieManager != null) {
       myCookieManager.dispose();

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/JavaScriptBridgeInterface.java

@@ -9,13 +9,7 @@ import android.webkit.ValueCallback;
 
 import com.pichillilorenzo.flutter_inappwebview.InAppWebView.InAppWebView;
 
-import org.json.JSONArray;
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
 import io.flutter.plugin.common.MethodChannel;
@@ -25,6 +19,7 @@ public class JavaScriptBridgeInterface {
   public static final String name = "flutter_inappwebview";
   private FlutterWebView flutterWebView;
   private InAppBrowserActivity inAppBrowserActivity;
+  public MethodChannel channel;
 
   // https://github.com/taylorhakes/promise-polyfill/blob/master/src/index.js
   public static final String promisePolyfillJS = "if (window.Promise == null) {" +
@@ -254,6 +249,7 @@ public class JavaScriptBridgeInterface {
       this.inAppBrowserActivity = (InAppBrowserActivity) obj;
     else if (obj instanceof FlutterWebView)
       this.flutterWebView = (FlutterWebView) obj;
+    this.channel = (this.inAppBrowserActivity != null) ? this.inAppBrowserActivity.channel : this.flutterWebView.channel;
   }
 
   @JavascriptInterface
@@ -277,7 +273,7 @@ public class JavaScriptBridgeInterface {
           webView.printCurrentPage();
         }
 
-        getChannel().invokeMethod("onCallJsHandler", obj, new MethodChannel.Result() {
+        channel.invokeMethod("onCallJsHandler", obj, new MethodChannel.Result() {
           @Override
           public void success(Object json) {
             if (webView == null) {
@@ -305,8 +301,4 @@ public class JavaScriptBridgeInterface {
       }
     });
   }
-
-  private MethodChannel getChannel() {
-    return (inAppBrowserActivity != null) ? InAppWebViewFlutterPlugin.inAppBrowser.channel : flutterWebView.channel;
-  }
 }

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/Shared.java

@@ -5,11 +5,13 @@ import android.content.Context;
 
 import io.flutter.embedding.engine.plugins.FlutterPlugin;
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.PluginRegistry;
 
 public class Shared {
   public static Context applicationContext;
   public static PluginRegistry.Registrar registrar;
+  public static BinaryMessenger messenger;
   public static FlutterPlugin.FlutterAssets flutterAssets;
   public static ActivityPluginBinding activityPluginBinding;
   public static Activity activity;

example/ios/Runner.xcodeproj/project.pbxproj

@@ -196,10 +196,9 @@
 			};
 			buildConfigurationList = 97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
-				English,
 				en,
 				Base,
 			);

example/lib/in_app_browser_example.screen.dart

@@ -38,9 +38,8 @@ class MyInAppBrowser extends InAppBrowser {
 
   @override
   Future<ShouldOverrideUrlLoadingAction> shouldOverrideUrlLoading(ShouldOverrideUrlLoadingRequest shouldOverrideUrlLoadingRequest) async {
-    print("\n\n override ${shouldOverrideUrlLoadingRequest.url}\n\n");
-    this.webViewController.loadUrl(url: shouldOverrideUrlLoadingRequest.url);
-    return ShouldOverrideUrlLoadingAction.CANCEL;
+    print("\n\nOverride ${shouldOverrideUrlLoadingRequest.url}\n\n");
+    return ShouldOverrideUrlLoadingAction.ALLOW;
   }
 
   @override
@@ -87,14 +86,15 @@ class _InAppBrowserExampleScreenState extends State<InAppBrowserExampleScreen> {
         drawer: myDrawer(context: context),
         body: Center(
           child: RaisedButton(
-              onPressed: () {
-                widget.browser.openFile(
+              onPressed: () async {
+                await widget.browser.openFile(
                     assetFilePath: "assets/index.html",
                     options: InAppBrowserClassOptions(
                         inAppWebViewWidgetOptions: InAppWebViewWidgetOptions(
                             crossPlatform: InAppWebViewOptions(
-                            useShouldOverrideUrlLoading: true,
-                            useOnLoadResource: true,
+                              debuggingEnabled: true,
+                              useShouldOverrideUrlLoading: true,
+                              useOnLoadResource: true,
                     ))));
               },
               child: Text("Open Webview Browser")),

example/lib/in_app_webiew_example.screen.dart

@@ -59,6 +59,7 @@ class _InAppWebViewExampleScreenState extends State<InAppWebViewExampleScreen> {
                     ),
                     onWebViewCreated: (InAppWebViewController controller) {
                       webView = controller;
+                      print("onWebViewCreated");
                     },
                     onLoadStart: (InAppWebViewController controller, String url) {
                       print("onLoadStart $url");
@@ -71,6 +72,29 @@ class _InAppWebViewExampleScreenState extends State<InAppWebViewExampleScreen> {
                       setState(() {
                         this.url = url;
                       });
+                      /*var origins = await WebStorageManager.instance().android.getOrigins();
+                      for (var origin in origins) {
+                        print(origin);
+                        print(await WebStorageManager.instance().android.getQuotaForOrigin(origin: origin.origin));
+                        print(await WebStorageManager.instance().android.getUsageForOrigin(origin: origin.origin));
+                      }
+                      await WebStorageManager.instance().android.deleteAllData();
+                      print("\n\nDELETED\n\n");
+                      origins = await WebStorageManager.instance().android.getOrigins();
+                      for (var origin in origins) {
+                        print(origin);
+                        await WebStorageManager.instance().android.deleteOrigin(origin: origin.origin);
+                      }*/
+                      /*var records = await WebStorageManager.instance().ios.fetchDataRecords(dataTypes: IOSWKWebsiteDataType.ALL);
+                      for(var record in records) {
+                        print(record);
+                      }
+                      await WebStorageManager.instance().ios.removeDataModifiedSince(dataTypes: IOSWKWebsiteDataType.ALL, date: DateTime(0));
+                      print("\n\nDELETED\n\n");
+                      records = await WebStorageManager.instance().ios.fetchDataRecords(dataTypes: IOSWKWebsiteDataType.ALL);
+                      for(var record in records) {
+                        print(record);
+                      }*/
                     },
                     onProgressChanged: (InAppWebViewController controller, int progress) {
                       setState(() {

ios/Classes/ChromeSafariBrowserManager.swift

+//
+//  ChromeSafariBrowserManager.swift
+//  flutter_inappwebview
+//
+//  Created by Lorenzo Pichilli on 18/12/2019.
+//
+
+import Flutter
+import UIKit
+import WebKit
+import Foundation
+import AVFoundation
+import SafariServices
+
+public class ChromeSafariBrowserManager: NSObject, FlutterPlugin {
+    static var registrar: FlutterPluginRegistrar?
+    static var channel: FlutterMethodChannel?
+    
+    var tmpWindow: UIWindow?
+    private var previousStatusBarStyle = -1
+    
+    public static func register(with registrar: FlutterPluginRegistrar) {
+        
+    }
+    
+    init(registrar: FlutterPluginRegistrar) {
+        super.init()
+        ChromeSafariBrowserManager.registrar = registrar
+        ChromeSafariBrowserManager.channel = FlutterMethodChannel(name: "com.pichillilorenzo/flutter_chromesafaribrowser", binaryMessenger: registrar.messenger())
+        registrar.addMethodCallDelegate(self, channel: ChromeSafariBrowserManager.channel!)
+    }
+    
+    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        let arguments = call.arguments as? NSDictionary
+        let uuid: String = arguments!["uuid"] as! String
+
+        switch call.method {
+            case "open":
+                let url = arguments!["url"] as! String
+                let options = arguments!["options"] as! [String: Any?]
+                let uuidFallback: String = arguments!["uuidFallback"] as! String
+                let headersFallback = arguments!["headersFallback"] as! [String: String]
+                let optionsFallback = arguments!["optionsFallback"] as! [String: Any?]
+                open(uuid: uuid, url: url, options: options, uuidFallback: uuidFallback, headersFallback: headersFallback, optionsFallback: optionsFallback, result: result)
+                break
+            default:
+                result(FlutterMethodNotImplemented)
+                break
+        }
+    }
+    
+    public func open(uuid: String, url: String, options: [String: Any?], uuidFallback: String?, headersFallback: [String: String], optionsFallback: [String: Any?], result: @escaping FlutterResult) {
+        let absoluteUrl = URL(string: url)!.absoluteURL
+        
+        if self.previousStatusBarStyle == -1 {
+            self.previousStatusBarStyle = UIApplication.shared.statusBarStyle.rawValue
+        }
+        
+        if !(self.tmpWindow != nil) {
+            let frame: CGRect = UIScreen.main.bounds
+            self.tmpWindow = UIWindow(frame: frame)
+        }
+        
+        let tmpController = UIViewController()
+        let baseWindowLevel = UIApplication.shared.keyWindow?.windowLevel
+        self.tmpWindow!.rootViewController = tmpController
+        self.tmpWindow!.windowLevel = UIWindow.Level(baseWindowLevel!.rawValue + 1.0)
+        self.tmpWindow!.makeKeyAndVisible()
+        
+        if #available(iOS 9.0, *) {
+            let safariOptions = SafariBrowserOptions()
+            let _ = safariOptions.parse(options: options)
+            
+            let safari: SafariViewController
+            
+            if #available(iOS 11.0, *) {
+                let config = SFSafariViewController.Configuration()
+                config.entersReaderIfAvailable = safariOptions.entersReaderIfAvailable
+                config.barCollapsingEnabled = safariOptions.barCollapsingEnabled
+                
+                safari = SafariViewController(url: absoluteUrl, configuration: config)
+            } else {
+                // Fallback on earlier versions
+                safari = SafariViewController(url: absoluteUrl)
+            }
+            
+            safari.uuid = uuid
+            safari.prepareMethodChannel()
+            safari.delegate = safari
+            safari.tmpWindow = tmpWindow
+            safari.safariOptions = safariOptions
+            
+            tmpController.present(safari, animated: true) {
+                result(true)
+            }
+            return
+        }
+        else {
+            if uuidFallback == nil {
+                print("No WebView fallback declared.")
+                result(true)
+                
+                return
+            }
+            SwiftFlutterPlugin.instance!.inAppBrowserManager!.openUrl(uuid: uuidFallback!, url: url, options: optionsFallback, headers: headersFallback)
+        }
+    }
+}

ios/Classes/CustomeSchemeHandler.swift

@@ -19,14 +19,14 @@ class CustomeSchemeHandler : NSObject, WKURLSchemeHandler {
         if let url = urlSchemeTask.request.url, let scheme = url.scheme {
             inAppWebView.onLoadResourceCustomScheme(scheme: scheme, url: url.absoluteString, result: {(result) -> Void in
                 if result is FlutterError {
-                    print((result as! FlutterError).message)
+                    print((result as! FlutterError).message ?? "")
                 }
                 else if (result as? NSObject) == FlutterMethodNotImplemented {}
                 else {
                     let json: [String: Any]
                     if let r = result {
                         json = r as! [String: Any]
-                        let urlResponse = URLResponse(url: url, mimeType: json["content-type"] as! String, expectedContentLength: -1, textEncodingName: json["content-encoding"] as! String)
+                        let urlResponse = URLResponse(url: url, mimeType: (json["content-type"] as! String), expectedContentLength: -1, textEncodingName: (json["content-encoding"] as! String))
                         let data = json["data"] as! FlutterStandardTypedData
                         if (self.schemeHandlers[urlSchemeTask.hash] != nil) {
                             urlSchemeTask.didReceive(urlResponse)

ios/Classes/FlutterWebViewController.swift

@@ -25,20 +25,20 @@ public class FlutterWebViewController: FlutterMethodCallDelegate, FlutterPlatfor
         myView = UIView(frame: frame)
         
         let channelName = "com.pichillilorenzo/flutter_inappwebview_" + String(viewId)
-        self.channel = FlutterMethodChannel(name: channelName, binaryMessenger: registrar.messenger())
-        self.channel?.setMethodCallHandler(LeakAvoider(delegate: self).handle)
+        channel = FlutterMethodChannel(name: channelName, binaryMessenger: registrar.messenger())
+        channel!.setMethodCallHandler(LeakAvoider(delegate: self).handle)
         
-        let initialUrl = (args["initialUrl"] as? String)!
+        let initialUrl = args["initialUrl"] as? String
         let initialFile = args["initialFile"] as? String
         let initialData = args["initialData"] as? [String: String]
-        let initialHeaders = (args["initialHeaders"] as? [String: String])!
-        let initialOptions = (args["initialOptions"] as? [String: Any])!
+        let initialHeaders = args["initialHeaders"] as? [String: String]
+        let initialOptions = args["initialOptions"] as! [String: Any?]
 
         let options = InAppWebViewOptions()
-        options.parse(options: initialOptions)
+        let _ = options.parse(options: initialOptions)
         let preWebviewConfiguration = InAppWebView.preWKWebViewConfiguration(options: options)
 
-        webView = InAppWebView(frame: myView!.bounds, configuration: preWebviewConfiguration, IABController: nil, channel: self.channel)
+        webView = InAppWebView(frame: myView!.bounds, configuration: preWebviewConfiguration, IABController: nil, channel: channel!)
         webView!.autoresizingMask = [.flexibleWidth, .flexibleHeight]
         myView!.addSubview(webView!)
         
@@ -76,7 +76,7 @@ public class FlutterWebViewController: FlutterMethodCallDelegate, FlutterPlatfor
     
     deinit {
         print("FlutterWebViewController - dealloc")
-        self.channel?.setMethodCallHandler(nil)
+        channel?.setMethodCallHandler(nil)
         webView!.dispose()
         webView = nil
         myView = nil
@@ -86,7 +86,7 @@ public class FlutterWebViewController: FlutterMethodCallDelegate, FlutterPlatfor
         return myView!
     }
     
-    public func load(initialUrl: String, initialFile: String?, initialData: [String: String]?, initialHeaders: [String: String]) {
+    public func load(initialUrl: String?, initialFile: String?, initialData: [String: String]?, initialHeaders: [String: String]?) {
         if initialFile != nil {
             do {
                 try webView!.loadFile(url: initialFile!, headers: initialHeaders)
@@ -98,14 +98,14 @@ public class FlutterWebViewController: FlutterMethodCallDelegate, FlutterPlatfor
         }
         
         if initialData != nil {
-            let data = (initialData!["data"] as? String)!
-            let mimeType = (initialData!["mimeType"] as? String)!
-            let encoding = (initialData!["encoding"] as? String)!
-            let baseUrl = (initialData!["baseUrl"] as? String)!
+            let data = initialData!["data"]!
+            let mimeType = initialData!["mimeType"]!
+            let encoding = initialData!["encoding"]!
+            let baseUrl = initialData!["baseUrl"]!
             webView!.loadData(data: data, mimeType: mimeType, encoding: encoding, baseUrl: baseUrl)
         }
         else {
-            webView!.loadUrl(url: URL(string: initialUrl)!, headers: initialHeaders)
+            webView!.loadUrl(url: URL(string: initialUrl!)!, headers: initialHeaders)
         }
     }
     
@@ -263,7 +263,7 @@ public class FlutterWebViewController: FlutterMethodCallDelegate, FlutterPlatfor
                 if webView != nil {
                     let inAppWebViewOptions = InAppWebViewOptions()
                     let inAppWebViewOptionsMap = arguments!["options"] as! [String: Any]
-                    inAppWebViewOptions.parse(options: inAppWebViewOptionsMap)
+                    let _ = inAppWebViewOptions.parse(options: inAppWebViewOptionsMap)
                     webView!.setOptions(newOptions: inAppWebViewOptions, newOptionsMap: inAppWebViewOptionsMap)
                 }
                 result(true)
@@ -277,8 +277,13 @@ public class FlutterWebViewController: FlutterMethodCallDelegate, FlutterPlatfor
             case "findAllAsync":
                 if webView != nil {
                     let find = arguments!["find"] as! String
-                    webView!.findAllAsync(find: find, completionHandler: nil)
+                    webView!.findAllAsync(find: find, completionHandler: {(value, error) in
+                    if error != nil {
+                        result(FlutterError(code: "FlutterWebViewController", message: error?.localizedDescription, details: nil))
+                        return
+                    }
                     result(true)
+                })
                 } else {
                     result(false)
                 }
@@ -347,13 +352,12 @@ public class FlutterWebViewController: FlutterMethodCallDelegate, FlutterPlatfor
             case "printCurrentPage":
                 if webView != nil {
                     webView!.printCurrentPage(printCompletionHandler: {(completed, error) in
-                        if !completed, let e = error {
+                        if !completed, let _ = error {
                             result(false)
                             return
                         }
                         result(true)
                     })
-                    
                 } else {
                     result(false)
                 }

ios/Classes/InAppBrowserManager.swift

+//
+//  InAppBrowserManager.swift
+//  flutter_inappwebview
+//
+//  Created by Lorenzo Pichilli on 18/12/2019.
+//
+
+import Flutter
+import UIKit
+import WebKit
+import Foundation
+import AVFoundation
+
+let WEBVIEW_STORYBOARD = "WebView"
+let WEBVIEW_STORYBOARD_CONTROLLER_ID = "viewController"
+
+public class InAppBrowserManager: NSObject, FlutterPlugin {
+    static var registrar: FlutterPluginRegistrar?
+    static var channel: FlutterMethodChannel?
+    
+    var tmpWindow: UIWindow?
+    private var previousStatusBarStyle = -1
+    
+    public static func register(with registrar: FlutterPluginRegistrar) {
+        
+    }
+    
+    init(registrar: FlutterPluginRegistrar) {
+        super.init()
+        InAppBrowserManager.registrar = registrar
+        InAppBrowserManager.channel = FlutterMethodChannel(name: "com.pichillilorenzo/flutter_inappbrowser", binaryMessenger: registrar.messenger())
+        registrar.addMethodCallDelegate(self, channel: InAppBrowserManager.channel!)
+    }
+    
+    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        let arguments = call.arguments as? NSDictionary
+        let uuid: String = arguments!["uuid"] as! String
+
+        switch call.method {
+            case "openUrl":
+                let url = arguments!["url"] as! String
+                let options = arguments!["options"] as! [String: Any?]
+                let headers = arguments!["headers"] as! [String: String]
+                openUrl(uuid: uuid, url: url, options: options, headers: headers)
+                result(true)
+                break
+            case "openFile":
+                var url = arguments!["url"] as! String
+                let key = InAppBrowserManager.registrar!.lookupKey(forAsset: url)
+                let assetURL = Bundle.main.url(forResource: key, withExtension: nil)
+                if assetURL == nil {
+                    result(FlutterError(code: "InAppBrowserFlutterPlugin", message: url + " asset file cannot be found!", details: nil))
+                    return
+                } else {
+                    url = assetURL!.absoluteString
+                }
+                let options = arguments!["options"] as! [String: Any?]
+                let headers = arguments!["headers"] as! [String: String]
+                openUrl(uuid: uuid, url: url, options: options, headers: headers)
+                result(true)
+                break
+            case "openData":
+                let options = arguments!["options"] as! [String: Any?]
+                let data = arguments!["data"] as! String
+                let mimeType = arguments!["mimeType"] as! String
+                let encoding = arguments!["encoding"] as! String
+                let baseUrl = arguments!["baseUrl"] as! String
+                openData(uuid: uuid, options: options, data: data, mimeType: mimeType, encoding: encoding, baseUrl: baseUrl)
+                result(true)
+                break
+            case "openWithSystemBrowser":
+                let url = arguments!["url"] as! String
+                openWithSystemBrowser(url: url, result: result)
+                break
+            default:
+                result(FlutterMethodNotImplemented)
+                break
+        }
+    }
+    
+    public func prepareInAppBrowserWebViewController(options: [String: Any?]) -> InAppBrowserWebViewController {
+        if self.previousStatusBarStyle == -1 {
+            self.previousStatusBarStyle = UIApplication.shared.statusBarStyle.rawValue
+        }
+        
+        if !(self.tmpWindow != nil) {
+            let frame: CGRect = UIScreen.main.bounds
+            self.tmpWindow = UIWindow(frame: frame)
+        }
+        
+        let tmpController = UIViewController()
+        let baseWindowLevel = UIApplication.shared.keyWindow?.windowLevel
+        self.tmpWindow!.rootViewController = tmpController
+        self.tmpWindow!.windowLevel = UIWindow.Level(baseWindowLevel!.rawValue + 1.0)
+        self.tmpWindow!.makeKeyAndVisible()
+        
+        let browserOptions = InAppBrowserOptions()
+        let _ = browserOptions.parse(options: options)
+        
+        let webViewOptions = InAppWebViewOptions()
+        let _ = webViewOptions.parse(options: options)
+        
+        let storyboard = UIStoryboard(name: WEBVIEW_STORYBOARD, bundle: Bundle(for: InAppWebViewFlutterPlugin.self))
+        let webViewController = storyboard.instantiateViewController(withIdentifier: WEBVIEW_STORYBOARD_CONTROLLER_ID) as! InAppBrowserWebViewController
+        webViewController.browserOptions = browserOptions
+        webViewController.webViewOptions = webViewOptions
+        webViewController.isHidden = browserOptions.hidden
+        webViewController.previousStatusBarStyle = previousStatusBarStyle
+        return webViewController
+    }
+    
+    public func openUrl(uuid: String, url: String, options: [String: Any?], headers: [String: String]) {
+        let absoluteUrl = URL(string: url)!.absoluteURL
+        let webViewController = prepareInAppBrowserWebViewController(options: options)
+        
+        webViewController.uuid = uuid
+        webViewController.prepareMethodChannel()
+        webViewController.tmpWindow = tmpWindow
+        webViewController.initURL = absoluteUrl
+        webViewController.initHeaders = headers
+        
+        if webViewController.isHidden {
+            webViewController.view.isHidden = true
+            tmpWindow!.rootViewController!.present(webViewController, animated: false, completion: {() -> Void in
+
+            })
+            webViewController.presentingViewController?.dismiss(animated: false, completion: {() -> Void in
+                self.tmpWindow?.windowLevel = UIWindow.Level(rawValue: 0.0)
+                UIApplication.shared.delegate?.window??.makeKeyAndVisible()
+            })
+        }
+        else {
+            tmpWindow!.rootViewController!.present(webViewController, animated: true, completion: {() -> Void in
+
+            })
+        }
+    }
+    
+    public func openData(uuid: String, options: [String: Any?], data: String, mimeType: String, encoding: String, baseUrl: String) {
+        let webViewController = prepareInAppBrowserWebViewController(options: options)
+        
+        webViewController.uuid = uuid
+        webViewController.tmpWindow = tmpWindow
+        webViewController.initData = data
+        webViewController.initMimeType = mimeType
+        webViewController.initEncoding = encoding
+        webViewController.initBaseUrl = baseUrl
+        
+        if webViewController.isHidden {
+            webViewController.view.isHidden = true
+            tmpWindow!.rootViewController!.present(webViewController, animated: false, completion: {() -> Void in
+                webViewController.webView.loadData(data: data, mimeType: mimeType, encoding: encoding, baseUrl: baseUrl)
+            })
+            webViewController.presentingViewController?.dismiss(animated: false, completion: {() -> Void in
+                self.tmpWindow?.windowLevel = UIWindow.Level(rawValue: 0.0)
+                UIApplication.shared.delegate?.window??.makeKeyAndVisible()
+            })
+        }
+        else {
+            tmpWindow!.rootViewController!.present(webViewController, animated: true, completion: {() -> Void in
+                webViewController.webView.loadData(data: data, mimeType: mimeType, encoding: encoding, baseUrl: baseUrl)
+            })
+        }
+    }
+    
+    public func openWithSystemBrowser(url: String, result: @escaping FlutterResult) {
+        let absoluteUrl = URL(string: url)!.absoluteURL
+        if !UIApplication.shared.canOpenURL(absoluteUrl) {
+            result(FlutterError(code: "InAppBrowserManager", message: url + " cannot be opened!", details: nil))
+            return
+        }
+        else {
+            if #available(iOS 10.0, *) {
+                UIApplication.shared.open(absoluteUrl, options: convertToUIApplicationOpenExternalURLOptionsKeyDictionary([:]), completionHandler: nil)
+            } else {
+                UIApplication.shared.openURL(absoluteUrl)
+            }
+        }
+        result(true)
+    }
+}
+
+// Helper function inserted by Swift 4.2 migrator.
+fileprivate func convertToUIApplicationOpenExternalURLOptionsKeyDictionary(_ input: [String: Any]) -> [UIApplication.OpenExternalURLOptionsKey: Any] {
+    return Dictionary(uniqueKeysWithValues: input.map { key, value in (UIApplication.OpenExternalURLOptionsKey(rawValue: key), value)})
+}

ios/Classes/Options.swift

@@ -14,7 +14,7 @@ public class Options: NSObject {
         super.init()
     }
     
-    func parse(options: [String: Any]) -> Options {
+    func parse(options: [String: Any?]) -> Options {
         for (key, value) in options {
             if self.responds(to: Selector(key)) {
                 self.setValue(value, forKey: key)
@@ -23,8 +23,8 @@ public class Options: NSObject {
         return self
     }
     
-    func getHashMap() -> [String: Any] {
-        var options: [String: Any] = [:]
+    func getHashMap() -> [String: Any?] {
+        var options: [String: Any?] = [:]
         var counts = UInt32();
         let properties = class_copyPropertyList(object_getClass(self), &counts);
         for i in 0..<counts {

ios/Classes/SafariViewController.swift

@@ -9,16 +9,34 @@ import Foundation
 import SafariServices
 
 @available(iOS 9.0, *)
-class SafariViewController: SFSafariViewController, SFSafariViewControllerDelegate {
+public class SafariViewController: SFSafariViewController, FlutterPlugin, SFSafariViewControllerDelegate {
     
-    weak var statusDelegate: SwiftFlutterPlugin?
+    var channel: FlutterMethodChannel?
     var tmpWindow: UIWindow?
     var safariOptions: SafariBrowserOptions?
     var uuid: String = ""
     
-    override func viewWillAppear(_ animated: Bool) {
+    public static func register(with registrar: FlutterPluginRegistrar) {
+        
+    }
+    
+    deinit {
+        print("SafariViewController - dealloc")
+    }
+    
+    public func prepareMethodChannel() {
+        channel = FlutterMethodChannel(name: "com.pichillilorenzo/flutter_chromesafaribrowser_" + uuid, binaryMessenger: SwiftFlutterPlugin.instance!.registrar!.messenger())
+        SwiftFlutterPlugin.instance!.registrar!.addMethodCallDelegate(self, channel: channel!)
+    }
+    
+    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        
+    }
+    
+    public override func viewWillAppear(_ animated: Bool) {
         prepareSafariBrowser()
         super.viewWillAppear(animated)
+        onChromeSafariBrowserOpened()
     }
     
     func prepareSafariBrowser() {
@@ -45,50 +63,64 @@ class SafariViewController: SFSafariViewController, SFSafariViewControllerDelega
         DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(400), execute: {() -> Void in
             self.tmpWindow?.windowLevel = UIWindow.Level(rawValue: 0.0)
             UIApplication.shared.delegate?.window??.makeKeyAndVisible()
-            
-            if (self.statusDelegate != nil) {
-                self.statusDelegate?.safariExit(uuid: self.uuid)
-            }
+            self.onChromeSafariBrowserClosed()
+            self.dispose()
         })
     }
     
-    func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
+    public func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
         close()
     }
     
-    func safariViewController(_ controller: SFSafariViewController,
+    public func safariViewController(_ controller: SFSafariViewController,
                               didCompleteInitialLoad didLoadSuccessfully: Bool) {
         if didLoadSuccessfully {
-            statusDelegate?.onChromeSafariBrowserCompletedInitialLoad(uuid: self.uuid)
+            onChromeSafariBrowserCompletedInitialLoad()
         }
         else {
             print("Cant load successfully the 'SafariViewController'.")
         }
     }
     
-    func safariViewController(_ controller: SFSafariViewController, activityItemsFor URL: URL, title: String?) -> [UIActivity] {
+    public func safariViewController(_ controller: SFSafariViewController, activityItemsFor URL: URL, title: String?) -> [UIActivity] {
 //        print("activityItemsFor")
 //        print(URL)
 //        print(title)
         return []
     }
 
-    func safariViewController(_ controller: SFSafariViewController, excludedActivityTypesFor URL: URL, title: String?) -> [UIActivity.ActivityType] {
+    public func safariViewController(_ controller: SFSafariViewController, excludedActivityTypesFor URL: URL, title: String?) -> [UIActivity.ActivityType] {
 //        print("excludedActivityTypesFor")
 //        print(URL)
 //        print(title)
         return []
     }
 
-    func safariViewController(_ controller: SFSafariViewController, initialLoadDidRedirectTo URL: URL) {
+    public func safariViewController(_ controller: SFSafariViewController, initialLoadDidRedirectTo URL: URL) {
 //        print("initialLoadDidRedirectTo")
 //        print(URL)
     }
     
+    public func onChromeSafariBrowserOpened() {
+        channel!.invokeMethod("onChromeSafariBrowserOpened", arguments: [])
+    }
+    
+    public func onChromeSafariBrowserCompletedInitialLoad() {
+        channel!.invokeMethod("onChromeSafariBrowserCompletedInitialLoad", arguments: [])
+    }
+    
+    public func onChromeSafariBrowserClosed() {
+        channel!.invokeMethod("onChromeSafariBrowserClosed", arguments: [])
+    }
+    
+    public func dispose() {
+        delegate = nil
+        channel!.setMethodCallHandler(nil)
+    }
+    
     // Helper function to convert hex color string to UIColor
     // Assumes input like "#00FF00" (#RRGGBB).
     // Taken from https://stackoverflow.com/questions/1560081/how-can-i-create-a-uicolor-from-a-hex-string
-    
     func color(fromHexString: String, alpha:CGFloat? = 1.0) -> UIColor {
         
         // Convert hex string to an integer

lib/flutter_inappwebview.dart

@@ -24,7 +24,6 @@ library flutter_inappwebview;
 export 'src/types.dart';
 export 'src/in_app_webview.dart';
 export 'src/in_app_browser.dart';
-export 'src/channel_manager.dart';
 export 'src/cookie_manager.dart';
 export 'src/chrome_safari_browser.dart';
 export 'src/chrome_safari_browser.dart';

lib/src/channel_manager.dart

-import 'dart:async';
-import 'dart:collection';
-
-import 'package:flutter/services.dart';
-
-import 'types.dart' show ListenerCallback;
-
-class ChannelManager {
-  static const MethodChannel channel =
-      const MethodChannel('com.pichillilorenzo/flutter_inappbrowser');
-  static bool initialized = false;
-  static final listeners = HashMap<String, ListenerCallback>();
-
-  static Future<dynamic> _handleMethod(MethodCall call) async {
-    String uuid = call.arguments["uuid"];
-    return await listeners[uuid](call);
-  }
-
-  static void addListener(String key, ListenerCallback callback) {
-    if (!initialized) init();
-    listeners.putIfAbsent(key, () => callback);
-  }
-
-  static void init() {
-    channel.setMethodCallHandler(_handleMethod);
-    initialized = true;
-  }
-}

lib/src/chrome_safari_browser.dart

@@ -5,7 +5,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 
 import 'types.dart';
-import 'channel_manager.dart';
 import 'in_app_browser.dart';
 
 ///ChromeSafariBrowser class.
@@ -18,12 +17,16 @@ class ChromeSafariBrowser {
   String uuid;
   InAppBrowser browserFallback;
   bool _isOpened = false;
+  MethodChannel _channel;
+  static const MethodChannel _sharedChannel = const MethodChannel('com.pichillilorenzo/flutter_chromesafaribrowser');
 
   ///Initialize the [ChromeSafariBrowser] instance with an [InAppBrowser] fallback instance or `null`.
   ChromeSafariBrowser({bFallback}) {
     uuid = uuidGenerator.v4();
     browserFallback = bFallback;
-    ChannelManager.addListener(uuid, handleMethod);
+    this._channel =
+        MethodChannel('com.pichillilorenzo/flutter_chromesafaribrowser_$uuid');
+    this._channel.setMethodCallHandler(handleMethod);
     _isOpened = false;
   }
 
@@ -94,15 +97,13 @@ class ChromeSafariBrowser {
 
     Map<String, dynamic> args = <String, dynamic>{};
     args.putIfAbsent('uuid', () => uuid);
-    args.putIfAbsent('uuidFallback',
-        () => (browserFallback != null) ? browserFallback.uuid : '');
     args.putIfAbsent('url', () => url);
-    args.putIfAbsent('headers', () => headersFallback);
     args.putIfAbsent('options', () => optionsMap);
+    args.putIfAbsent('uuidFallback',
+            () => (browserFallback != null) ? browserFallback.uuid : '');
+    args.putIfAbsent('headersFallback', () => headersFallback);
     args.putIfAbsent('optionsFallback', () => optionsFallbackMap);
-    args.putIfAbsent('isData', () => false);
-    args.putIfAbsent('useChromeSafariBrowser', () => true);
-    await ChannelManager.channel.invokeMethod('open', args);
+    await _sharedChannel.invokeMethod('open', args);
     this._isOpened = true;
   }
 

lib/src/in_app_browser.dart

@@ -7,7 +7,6 @@ import 'package:flutter/services.dart';
 import 'webview_options.dart';
 
 import 'types.dart';
-import 'channel_manager.dart';
 import 'in_app_webview.dart' show InAppWebViewController;
 
 ///InAppBrowser class. [webViewController] can be used to access the [InAppWebView] API.
@@ -18,6 +17,8 @@ class InAppBrowser {
   Map<String, JavaScriptHandlerCallback> javaScriptHandlersMap =
       HashMap<String, JavaScriptHandlerCallback>();
   bool _isOpened = false;
+  MethodChannel _channel;
+  static const MethodChannel _sharedChannel = const MethodChannel('com.pichillilorenzo/flutter_inappbrowser');
 
   /// WebView Controller that can be used to access the [InAppWebView] API.
   InAppWebViewController webViewController;
@@ -25,10 +26,12 @@ class InAppBrowser {
   ///
   InAppBrowser() {
     uuid = uuidGenerator.v4();
-    ChannelManager.addListener(uuid, handleMethod);
+    this._channel =
+        MethodChannel('com.pichillilorenzo/flutter_inappbrowser_$uuid');
+    this._channel.setMethodCallHandler(handleMethod);
     _isOpened = false;
     webViewController = new InAppWebViewController.fromInAppBrowser(
-        uuid, ChannelManager.channel, this);
+        uuid, this._channel, this);
   }
 
   Future<dynamic> handleMethod(MethodCall call) async {
@@ -53,8 +56,8 @@ class InAppBrowser {
   ///[headers]: The additional headers to be used in the HTTP request for this URL, specified as a map from name to value.
   ///
   ///[options]: Options for the [InAppBrowser].
-  Future<void> open(
-      {String url = "about:blank",
+  Future<void> openUrl(
+      {@required String url,
       Map<String, String> headers = const {},
       InAppBrowserClassOptions options}) async {
     assert(url != null && url.isNotEmpty);
@@ -83,14 +86,10 @@ class InAppBrowser {
     args.putIfAbsent('url', () => url);
     args.putIfAbsent('headers', () => headers);
     args.putIfAbsent('options', () => optionsMap);
-    args.putIfAbsent('openWithSystemBrowser', () => false);
-    args.putIfAbsent('isLocalFile', () => false);
-    args.putIfAbsent('isData', () => false);
-    args.putIfAbsent('useChromeSafariBrowser', () => false);
-    await ChannelManager.channel.invokeMethod('open', args);
+    await _sharedChannel.invokeMethod('openUrl', args);
   }
 
-  ///Opens the given [assetFilePath] file in a new [InAppBrowser] instance. The other arguments are the same of [InAppBrowser.open].
+  ///Opens the given [assetFilePath] file in a new [InAppBrowser] instance. The other arguments are the same of [InAppBrowser.openUrl].
   ///
   ///To be able to load your local files (assets, js, css, etc.), you need to add them in the `assets` section of the `pubspec.yaml` file, otherwise they cannot be found!
   ///
@@ -153,11 +152,7 @@ class InAppBrowser {
     args.putIfAbsent('url', () => assetFilePath);
     args.putIfAbsent('headers', () => headers);
     args.putIfAbsent('options', () => optionsMap);
-    args.putIfAbsent('openWithSystemBrowser', () => false);
-    args.putIfAbsent('isLocalFile', () => true);
-    args.putIfAbsent('isData', () => false);
-    args.putIfAbsent('useChromeSafariBrowser', () => false);
-    await ChannelManager.channel.invokeMethod('open', args);
+    await _sharedChannel.invokeMethod('openFile', args);
   }
 
   ///Opens a new [InAppBrowser] instance with [data] as a content, using [baseUrl] as the base URL for it.
@@ -203,26 +198,16 @@ class InAppBrowser {
     args.putIfAbsent('mimeType', () => mimeType);
     args.putIfAbsent('encoding', () => encoding);
     args.putIfAbsent('baseUrl', () => baseUrl);
-    args.putIfAbsent('openWithSystemBrowser', () => false);
-    args.putIfAbsent('isLocalFile', () => false);
-    args.putIfAbsent('isData', () => true);
-    args.putIfAbsent('useChromeSafariBrowser', () => false);
-    await ChannelManager.channel.invokeMethod('open', args);
+    args.putIfAbsent('historyUrl', () => androidHistoryUrl);
+    await _sharedChannel.invokeMethod('openData', args);
   }
 
   ///This is a static method that opens an [url] in the system browser. You wont be able to use the [InAppBrowser] methods here!
   static Future<void> openWithSystemBrowser({@required String url}) async {
     assert(url != null && url.isNotEmpty);
     Map<String, dynamic> args = <String, dynamic>{};
-    args.putIfAbsent('uuid', () => "");
     args.putIfAbsent('url', () => url);
-    args.putIfAbsent('headers', () => {});
-    args.putIfAbsent('isLocalFile', () => false);
-    args.putIfAbsent('isData', () => false);
-    args.putIfAbsent('openWithSystemBrowser', () => true);
-    args.putIfAbsent('useChromeSafariBrowser', () => false);
-    args.putIfAbsent('options', () => {});
-    return await ChannelManager.channel.invokeMethod('open', args);
+    return await _sharedChannel.invokeMethod('openWithSystemBrowser', args);
   }
 
   ///Displays an [InAppBrowser] window that was opened hidden. Calling this has no effect if the [InAppBrowser] was already visible.
@@ -230,31 +215,28 @@ class InAppBrowser {
     this.throwIsNotOpened();
     Map<String, dynamic> args = <String, dynamic>{};
     args.putIfAbsent('uuid', () => uuid);
-    await ChannelManager.channel.invokeMethod('show', args);
+    await _channel.invokeMethod('show', args);
   }
 
   ///Hides the [InAppBrowser] window. Calling this has no effect if the [InAppBrowser] was already hidden.
   Future<void> hide() async {
     this.throwIsNotOpened();
     Map<String, dynamic> args = <String, dynamic>{};
-    args.putIfAbsent('uuid', () => uuid);
-    await ChannelManager.channel.invokeMethod('hide', args);
+    await _channel.invokeMethod('hide', args);
   }
 
   ///Closes the [InAppBrowser] window.
   Future<void> close() async {
     this.throwIsNotOpened();
     Map<String, dynamic> args = <String, dynamic>{};
-    args.putIfAbsent('uuid', () => uuid);
-    await ChannelManager.channel.invokeMethod('close', args);
+    await _channel.invokeMethod('close', args);
   }
 
   ///Check if the Web View of the [InAppBrowser] instance is hidden.
   Future<bool> isHidden() async {
     this.throwIsNotOpened();
     Map<String, dynamic> args = <String, dynamic>{};
-    args.putIfAbsent('uuid', () => uuid);
-    return await ChannelManager.channel.invokeMethod('isHidden', args);
+    return await _channel.invokeMethod('isHidden', args);
   }
 
   ///Sets the [InAppBrowser] options with the new [options] and evaluates them.
@@ -280,23 +262,19 @@ class InAppBrowser {
     }
 
     Map<String, dynamic> args = <String, dynamic>{};
-    args.putIfAbsent('uuid', () => uuid);
     args.putIfAbsent('options', () => optionsMap);
-    args.putIfAbsent('optionsType', () => "InAppBrowserOptions");
-    await ChannelManager.channel.invokeMethod('setOptions', args);
+    await _channel.invokeMethod('setOptions', args);
   }
 
   ///Gets the current [InAppBrowser] options as a `Map`. Returns `null` if the options are not setted yet.
   Future<InAppBrowserClassOptions> getOptions() async {
     this.throwIsNotOpened();
     Map<String, dynamic> args = <String, dynamic>{};
-    args.putIfAbsent('uuid', () => uuid);
-    args.putIfAbsent('optionsType', () => "InAppBrowserOptions");
 
     InAppBrowserClassOptions inAppBrowserClassOptions =
         InAppBrowserClassOptions();
     Map<dynamic, dynamic> options =
-        await ChannelManager.channel.invokeMethod('getOptions', args);
+        await _channel.invokeMethod('getOptions', args);
     if (options != null) {
       options = options.cast<String, dynamic>();
       inAppBrowserClassOptions.crossPlatform =

lib/src/types.dart

@@ -9,8 +9,6 @@ import 'webview_options.dart';
 
 var uuidGenerator = new Uuid();
 
-typedef Future<dynamic> ListenerCallback(MethodCall call);
-
 ///This type represents a callback, added with [addJavaScriptHandler], that listens to post messages sent from JavaScript.
 ///
 ///The Android implementation uses [addJavascriptInterface](https://developer.android.com/reference/android/webkit/WebView#addJavascriptInterface(java.lang.Object,%20java.lang.String)).