fix #98, fix #93, fix #80

CHANGELOG.md

+## 1.2.0
+
+- Merge "Adds a transparentBackground option for iOS and Android" [#86](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/86) (thanks to [matthewlloyd](https://github.com/matthewlloyd))
+- Merge "The 'open' method requires an options dictionary" [#87](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/87) (thanks to [matthewlloyd](https://github.com/matthewlloyd))
+- Merge "iOS: Call setNeedsLayout() in scrollViewDidScroll()" [#88](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/88) (thanks to [matthewlloyd](https://github.com/matthewlloyd))
+- Fixed "java.lang.RuntimeException: Methods marked with @UiThread must be executed on the main thread." [#98](https://github.com/pichillilorenzo/flutter_inappbrowser/issues/98) (thanks to [DreamBuddy](https://github.com/DreamBuddy))
+- Fixed "app force close/crash when enabling zoom and repeatedly changing orientation and zoomin zoomout" [#93](https://github.com/pichillilorenzo/flutter_inappbrowser/issues/93)
+- Added `displayZoomControls` webview option for Android
+- Fixed "Compatibility with other plugins" [#80](https://github.com/pichillilorenzo/flutter_inappbrowser/issues/80)
+
 ## 1.1.3
 
 - Merge "Add null checks around calls to InAppWebView callbacks" [#85](https://github.com/pichillilorenzo/flutter_inappbrowser/pull/85) (thanks to [matthewlloyd](https://github.com/matthewlloyd))

README.md

@@ -246,6 +246,7 @@ All platforms support:
 
   - __clearSessionCache__: Set to `true` to have the session cookie cache cleared before the new window is opened.
   - __builtInZoomControls__: Set to `true` if the WebView should use its built-in zoom mechanisms. The default value is `false`.
+  - __displayZoomControls__: Set to `true` if the WebView should display on-screen zoom controls when using the built-in zoom mechanisms. The default value is `false`.
   - __supportZoom__: Set to `false` if the WebView should not support zooming using its on-screen zoom controls and gestures. The default value is `true`.
   - __databaseEnabled__: Set to `true` if you want the database storage API is enabled. The default value is `false`.
   - __domStorageEnabled__: Set to `true` if you want the DOM storage API is enabled. The default value is `false`.
@@ -819,6 +820,7 @@ Opens an `url` in a new `InAppBrowser` instance.
   - __closeOnCannotGoBack__: Set to `false` to not close the InAppBrowser when the user click on the back button and the WebView cannot go back to the history. The default value is `true`.
   - __clearSessionCache__: Set to `true` to have the session cookie cache cleared before the new window is opened.
   - __builtInZoomControls__: Set to `true` if the WebView should use its built-in zoom mechanisms. The default value is `false`.
+  - __displayZoomControls__: Set to `true` if the WebView should display on-screen zoom controls when using the built-in zoom mechanisms. The default value is `false`.
   - __supportZoom__: Set to `false` if the WebView should not support zooming using its on-screen zoom controls and gestures. The default value is `true`.
   - __databaseEnabled__: Set to `true` if you want the database storage API is enabled. The default value is `false`.
   - __domStorageEnabled__: Set to `true` if you want the DOM storage API is enabled. The default value is `false`.

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

@@ -30,13 +30,11 @@ public class FlutterWebView implements PlatformView, MethodCallHandler  {
   public InAppWebView webView;
   public MethodChannel channel;
   public final Registrar registrar;
-  public final Context context;
 
   public FlutterWebView(Registrar registrar, int id, HashMap<String, Object> params) {
 
     this.registrar = registrar;
     this.activity = registrar.activity();
-    this.context = registrar.context();
 
     String initialUrl = (String) params.get("initialUrl");
     String initialFile = (String) params.get("initialFile");
@@ -47,7 +45,7 @@ public class FlutterWebView implements PlatformView, MethodCallHandler  {
     InAppWebViewOptions options = new InAppWebViewOptions();
     options.parse(initialOptions);
 
-    webView = new InAppWebView(context, this, id, options);
+    webView = new InAppWebView(registrar, this, id, options);
     webView.prepare();
 
     channel = new MethodChannel(registrar.messenger(), "com.pichillilorenzo/flutter_inappwebview_" + id);

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/FlutterWebViewFactory.java

 package com.pichillilorenzo.flutter_inappbrowser;
 
-import android.app.Activity;
 import android.content.Context;
 
 import java.util.HashMap;
 
-import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.PluginRegistry.Registrar;
 import io.flutter.plugin.common.StandardMessageCodec;
 import io.flutter.plugin.platform.PlatformView;
 import io.flutter.plugin.platform.PlatformViewFactory;
 
 public class FlutterWebViewFactory extends PlatformViewFactory {
-  private final BinaryMessenger messenger;
   private final Registrar registrar;
-  private final Activity activity;
 
-  public FlutterWebViewFactory(Registrar registrar, Activity activity) {
+  public FlutterWebViewFactory(Registrar registrar) {
     super(StandardMessageCodec.INSTANCE);
     this.registrar = registrar;
-    this.messenger = registrar.messenger();
-    this.activity = activity;
   }
 
   @Override

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppBrowserActivity.java

 package com.pichillilorenzo.flutter_inappbrowser;
 
+import android.app.Activity;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
@@ -9,6 +10,7 @@ import android.graphics.drawable.ColorDrawable;
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AppCompatActivity;
 import android.os.Bundle;
+import android.util.Log;
 import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -25,6 +27,8 @@ import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
+import io.flutter.app.FlutterActivity;
+import io.flutter.app.FlutterApplication;
 import io.flutter.plugin.common.MethodChannel;
 
 public class InAppBrowserActivity extends AppCompatActivity {
@@ -39,6 +43,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
   public Map<String, String> headers;
   public ProgressBar progressBar;
   public boolean isHidden = false;
+  public String fromActivity;
 
   @Override
   protected void onCreate(Bundle savedInstanceState) {
@@ -51,6 +56,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
 
     Bundle b = getIntent().getExtras();
     uuid = b.getString("uuid");
+    fromActivity = b.getString("fromActivity");
 
     HashMap<String, Object> optionsMap = (HashMap<String, Object>) b.getSerializable("options");
 
@@ -247,7 +253,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
       if (canGoBack())
         goBack();
       else if (options.closeOnCannotGoBack)
-        InAppBrowserFlutterPlugin.close(uuid, null);
+        InAppBrowserFlutterPlugin.close(this, uuid, null);
       return true;
     }
     return super.onKeyDown(keyCode, event);
@@ -297,15 +303,20 @@ public class InAppBrowserActivity extends AppCompatActivity {
   }
 
   public void hide() {
-    isHidden = true;
-    Intent openActivity = new Intent(this, InAppBrowserFlutterPlugin.registrar.activity().getClass());
-    openActivity.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
-    startActivityIfNeeded(openActivity, 0);
+    try {
+      isHidden = true;
+      Intent openActivity = new Intent(this, Class.forName(fromActivity));
+      openActivity.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
+      startActivityIfNeeded(openActivity, 0);
+    } catch (ClassNotFoundException e) {
+      e.printStackTrace();
+      Log.d(LOG_TAG, e.getMessage());
+    }
   }
 
   public void show() {
     isHidden = false;
-    Intent openActivity = new Intent(InAppBrowserFlutterPlugin.registrar.activity(), InAppBrowserActivity.class);
+    Intent openActivity = new Intent(this, InAppBrowserActivity.class);
     openActivity.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
     startActivityIfNeeded(openActivity, 0);
   }
@@ -341,7 +352,7 @@ public class InAppBrowserActivity extends AppCompatActivity {
   }
 
   public void closeButtonClicked(MenuItem item) {
-    InAppBrowserFlutterPlugin.close(uuid, null);
+    InAppBrowserFlutterPlugin.close(this, uuid, null);
   }
 
   public byte[] takeScreenshot() {

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppBrowserFlutterPlugin.java

@@ -22,6 +22,7 @@
 package com.pichillilorenzo.flutter_inappbrowser;
 
 import android.app.Activity;
+import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
@@ -39,13 +40,12 @@ import com.pichillilorenzo.flutter_inappbrowser.ChromeCustomTabs.CustomTabActivi
 
 import java.io.IOException;
 import java.io.Serializable;
-import java.net.MalformedURLException;
-import java.net.URL;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import io.flutter.app.FlutterApplication;
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
@@ -57,17 +57,15 @@ import io.flutter.plugin.common.PluginRegistry.Registrar;
  */
 public class InAppBrowserFlutterPlugin implements MethodCallHandler {
 
-  public static Registrar registrar;
-  public Activity activity;
+  public Registrar registrar;
   public static MethodChannel channel;
   public static Map<String, InAppBrowserActivity> webViewActivities = new HashMap<>();
   public static Map<String, ChromeCustomTabsActivity> chromeCustomTabsActivities = new HashMap<>();
 
   protected static final String LOG_TAG = "IABFlutterPlugin";
 
-  public InAppBrowserFlutterPlugin(Registrar r, Activity activity) {
+  public InAppBrowserFlutterPlugin(Registrar r) {
     registrar = r;
-    this.activity = activity;
     channel = new MethodChannel(registrar.messenger(), "com.pichillilorenzo/flutter_inappbrowser");
   }
 
@@ -76,23 +74,26 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
    */
   public static void registerWith(Registrar registrar) {
     Activity activity = registrar.activity();
-
-    final MethodChannel channel = new MethodChannel(registrar.messenger(), "com.pichillilorenzo/flutter_inappbrowser");
-    channel.setMethodCallHandler(new InAppBrowserFlutterPlugin(registrar, activity));
-
-    new MyCookieManager(registrar);
-
-    registrar
-      .platformViewRegistry()
-      .registerViewFactory(
-              "com.pichillilorenzo/flutter_inappwebview", new FlutterWebViewFactory(registrar, activity));
+    // registrar.activity() may return null because of Flutter's background execution feature
+    // described here: https://medium.com/flutter-io/executing-dart-in-the-background-with-flutter-plugins-and-geofencing-2b3e40a1a124
+    if (activity != null) {
+      final MethodChannel channel = new MethodChannel(registrar.messenger(), "com.pichillilorenzo/flutter_inappbrowser");
+      channel.setMethodCallHandler(new InAppBrowserFlutterPlugin(registrar));
+
+      new MyCookieManager(registrar);
+
+      registrar
+              .platformViewRegistry()
+              .registerViewFactory(
+                      "com.pichillilorenzo/flutter_inappwebview", new FlutterWebViewFactory(registrar));
+    }
   }
 
   @Override
   public void onMethodCall(final MethodCall call, final Result result) {
     String source;
-    String jsWrapper;
     String urlFile;
+    final Activity activity = registrar.activity();
     final String uuid = (String) call.argument("uuid");
 
     switch (call.method) {
@@ -107,7 +108,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
 
           Log.d(LOG_TAG, "use Chrome Custom Tabs = " + useChromeSafariBrowser);
 
-          this.activity.runOnUiThread(new Runnable() {
+          activity.runOnUiThread(new Runnable() {
             @Override
             public void run() {
 
@@ -119,7 +120,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
 
                 final HashMap<String, Object> optionsFallback = (HashMap<String, Object>) call.argument("optionsFallback");
 
-                open(uuid, uuidFallback, url_final, options, headers, true, optionsFallback, result);
+                open(activity, uuid, uuidFallback, url_final, options, headers, true, optionsFallback, result);
               } else {
 
                 String url = url_final;
@@ -142,7 +143,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
                 // SYSTEM
                 if (openWithSystemBrowser) {
                   Log.d(LOG_TAG, "in system");
-                  openExternal(url, result);
+                  openExternal(activity, url, result);
                 } else {
                   //Load the dialer
                   if (url.startsWith(WebView.SCHEME_TEL)) {
@@ -158,7 +159,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
                   // load in InAppBrowserFlutterPlugin
                   else {
                     Log.d(LOG_TAG, "loading in InAppBrowserFlutterPlugin");
-                    open(uuid, null, url, options, headers, false, null, result);
+                    open(activity, uuid, null, url, options, headers, false, null, result);
                   }
                 }
               }
@@ -166,7 +167,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
           });
         }
         else {
-          this.activity.runOnUiThread(new Runnable() {
+          activity.runOnUiThread(new Runnable() {
             @Override
             public void run() {
               HashMap<String, Object> options = (HashMap<String, Object>) call.argument("options");
@@ -174,7 +175,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
               String mimeType = call.argument("mimeType").toString();
               String encoding = call.argument("encoding").toString();
               String baseUrl = call.argument("baseUrl").toString();
-              openData(uuid, options, data, mimeType, encoding, baseUrl);
+              openData(activity, uuid, options, data, mimeType, encoding, baseUrl);
               result.success(true);
             }
           });
@@ -208,7 +209,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
         loadFile(uuid, call.argument("url").toString(), (Map<String, String>) call.argument("headers"), result);
         break;
       case "close":
-        close(uuid, result);
+        close(activity, uuid, result);
         break;
       case "injectScriptCode":
         source = call.argument("source").toString();
@@ -349,7 +350,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
    * @param result
    * @return "" if ok, or error message.
    */
-  public void openExternal(String url, Result result) {
+  public void openExternal(Activity activity, String url, Result result) {
     try {
       Intent intent;
       intent = new Intent(Intent.ACTION_VIEW);
@@ -363,7 +364,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
       }
       intent.putExtra(Browser.EXTRA_APPLICATION_ID, activity.getPackageName());
       // CB-10795: Avoid circular loops by preventing it from opening in the current app
-      this.openExternalExcludeCurrentApp(intent);
+      this.openExternalExcludeCurrentApp(activity, intent);
       result.success(true);
       // not catching FileUriExposedException explicitly because buildtools<24 doesn't know about it
     } catch (java.lang.RuntimeException e) {
@@ -376,7 +377,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
    * Opens the intent, providing a chooser that excludes the current app to avoid
    * circular loops.
    */
-  private void openExternalExcludeCurrentApp(Intent intent) {
+  private void openExternalExcludeCurrentApp(Activity activity, Intent intent) {
     String currentPackage = activity.getPackageName();
     boolean hasCurrentPackage = false;
     PackageManager pm = activity.getPackageManager();
@@ -408,10 +409,11 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
     }
   }
 
-  public void open(String uuid, String uuidFallback, String url, HashMap<String, Object> options, Map<String, String> headers, boolean useChromeSafariBrowser, HashMap<String, Object> optionsFallback, Result result) {
+  public void open(Activity activity, String uuid, String uuidFallback, String url, HashMap<String, Object> options, Map<String, String> headers, boolean useChromeSafariBrowser, HashMap<String, Object> optionsFallback, 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);
@@ -451,7 +453,7 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
     result.error(LOG_TAG, "No WebView fallback declared.", null);
   }
 
-  public void openData(String uuid, HashMap<String, Object> options, String data, String mimeType, String encoding, String baseUrl) {
+  public void openData(Activity activity, String uuid, HashMap<String, Object> options, String data, String mimeType, String encoding, String baseUrl) {
     Intent intent = new Intent(activity, InAppBrowserActivity.class);
     Bundle extras = new Bundle();
 
@@ -597,10 +599,10 @@ public class InAppBrowserFlutterPlugin implements MethodCallHandler {
     return false;
   }
 
-  public static void close(final String uuid, final Result result) {
+  public static void close(Activity activity, final String uuid, final Result result) {
     final InAppBrowserActivity inAppBrowserActivity = webViewActivities.get(uuid);
     if (inAppBrowserActivity != null) {
-      registrar.activity().runOnUiThread(new Runnable() {
+      activity.runOnUiThread(new Runnable() {
         @Override
         public void run() {
 

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

@@ -32,15 +32,15 @@ import java.util.List;
 import java.util.Map;
 
 import io.flutter.plugin.common.MethodChannel;
+import io.flutter.plugin.common.PluginRegistry;
 import okhttp3.Cache;
 import okhttp3.OkHttpClient;
 
-import static com.pichillilorenzo.flutter_inappbrowser.InAppBrowserFlutterPlugin.registrar;
-
 public class InAppWebView extends WebView {
 
   static final String LOG_TAG = "InAppWebView";
 
+  public PluginRegistry.Registrar registrar;
   public InAppBrowserActivity inAppBrowserActivity;
   public FlutterWebView flutterWebView;
   int id;
@@ -91,8 +91,9 @@ public class InAppWebView extends WebView {
     super(context, attrs, defaultStyle);
   }
 
-  public InAppWebView(Context context, Object obj, int id, InAppWebViewOptions options) {
-    super(context);
+  public InAppWebView(PluginRegistry.Registrar registrar, Object obj, int id, InAppWebViewOptions options) {
+    super(registrar.activeContext());
+    this.registrar = registrar;
     if (obj instanceof InAppBrowserActivity)
       this.inAppBrowserActivity = (InAppBrowserActivity) obj;
     else if (obj instanceof FlutterWebView)
@@ -160,6 +161,8 @@ public class InAppWebView extends WebView {
     settings.setJavaScriptEnabled(options.javaScriptEnabled);
     settings.setJavaScriptCanOpenWindowsAutomatically(options.javaScriptCanOpenWindowsAutomatically);
     settings.setBuiltInZoomControls(options.builtInZoomControls);
+    settings.setDisplayZoomControls(options.displayZoomControls);
+
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
       settings.setSafeBrowsingEnabled(options.safeBrowsingEnabled);
 
@@ -312,6 +315,9 @@ public class InAppWebView extends WebView {
     if (newOptionsMap.get("builtInZoomControls") != null && options.builtInZoomControls != newOptions.builtInZoomControls)
       settings.setBuiltInZoomControls(newOptions.builtInZoomControls);
 
+    if (newOptionsMap.get("displayZoomControls") != null && options.displayZoomControls != newOptions.displayZoomControls)
+      settings.setDisplayZoomControls(newOptions.displayZoomControls);
+
     if (newOptionsMap.get("safeBrowsingEnabled") != null && options.safeBrowsingEnabled != newOptions.safeBrowsingEnabled && Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
       settings.setSafeBrowsingEnabled(newOptions.safeBrowsingEnabled);
 
@@ -341,6 +347,14 @@ public class InAppWebView extends WebView {
     if (newOptionsMap.get("textZoom") != null && options.textZoom != newOptions.textZoom)
       settings.setTextZoom(newOptions.textZoom);
 
+    if (newOptionsMap.get("transparentBackground") != null && options.transparentBackground != newOptions.transparentBackground) {
+      if (newOptions.transparentBackground) {
+        setBackgroundColor(Color.TRANSPARENT);
+      } else {
+        setBackgroundColor(Color.parseColor("#FFFFFF"));
+      }
+    }
+
     options = newOptions;
   }
 

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

@@ -6,6 +6,9 @@ import android.net.Uri;
 import android.net.http.SslError;
 import android.os.Build;
 import androidx.annotation.RequiresApi;
+
+import android.os.Handler;
+import android.os.Looper;
 import android.util.Log;
 import android.webkit.CookieManager;
 import android.webkit.CookieSyncManager;
@@ -341,7 +344,7 @@ public class InAppWebViewClient extends WebViewClient {
         headersRequest.put(entry.getKey().toLowerCase(), value.toString());
       }
 
-      Map<String, Object> obj = new HashMap<>();
+      final Map<String, Object> obj = new HashMap<>();
       Map<String, Object> res = new HashMap<>();
       Map<String, Object> req = new HashMap<>();
 
@@ -365,7 +368,15 @@ public class InAppWebViewClient extends WebViewClient {
       obj.put("response", res);
       obj.put("request", req);
 
-      getChannel().invokeMethod("onLoadResource", obj);
+      // java.lang.RuntimeException: Methods marked with @UiThread must be executed on the main thread.
+      // https://github.com/pichillilorenzo/flutter_inappbrowser/issues/98
+      final Handler handler = new Handler(Looper.getMainLooper());
+      handler.post(new Runnable() {
+         @Override
+         public void run() {
+           getChannel().invokeMethod("onLoadResource", obj);
+         }
+       });
 
       // this return is not working (it blocks some resources), so return null
 //      return new WebResourceResponse(

android/src/main/java/com/pichillilorenzo/flutter_inappbrowser/InAppWebView/InAppWebViewOptions.java

@@ -17,6 +17,7 @@ public class InAppWebViewOptions extends Options {
 
   public boolean clearSessionCache = false;
   public boolean builtInZoomControls = false;
+  public boolean displayZoomControls = false;
   public boolean supportZoom = true;
   public boolean databaseEnabled = false;
   public boolean domStorageEnabled = false;

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

 package com.pichillilorenzo.flutter_inappbrowser;
 
 import android.os.Build;
+import android.os.Handler;
+import android.os.Looper;
 import android.util.Log;
 import android.webkit.JavascriptInterface;
 
@@ -34,33 +36,42 @@ public class JavaScriptBridgeInterface {
 
   @JavascriptInterface
   public void _callHandler(String handlerName, final String _callHandlerID, String args) {
-    Map<String, Object> obj = new HashMap<>();
+    final Map<String, Object> obj = new HashMap<>();
     if (inAppBrowserActivity != null)
       obj.put("uuid", inAppBrowserActivity.uuid);
     obj.put("handlerName", handlerName);
     obj.put("args", args);
 
-    getChannel().invokeMethod("onCallJsHandler", obj, new MethodChannel.Result() {
+    // java.lang.RuntimeException: Methods marked with @UiThread must be executed on the main thread.
+    // https://github.com/pichillilorenzo/flutter_inappbrowser/issues/98
+    final Handler handler = new Handler(Looper.getMainLooper());
+    handler.post(new Runnable() {
       @Override
-      public void success(Object json) {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
-          flutterWebView.webView.evaluateJavascript("window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];", null);
-        }
-        else {
-          flutterWebView.webView.loadUrl("javascript:window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];");
-        }
-      }
+      public void run() {
+        getChannel().invokeMethod("onCallJsHandler", obj, new MethodChannel.Result() {
+          @Override
+          public void success(Object json) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+              flutterWebView.webView.evaluateJavascript("window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];", null);
+            }
+            else {
+              flutterWebView.webView.loadUrl("javascript:window." + name + "[" + _callHandlerID + "](" + json + "); delete window." + name + "[" + _callHandlerID + "];");
+            }
+          }
 
-      @Override
-      public void error(String s, String s1, Object o) {
-        Log.d(LOG_TAG, "ERROR: " + s + " " + s1);
-      }
+          @Override
+          public void error(String s, String s1, Object o) {
+            Log.d(LOG_TAG, "ERROR: " + s + " " + s1);
+          }
 
-      @Override
-      public void notImplemented() {
+          @Override
+          public void notImplemented() {
 
+          }
+        });
       }
     });
+
   }
 
   private MethodChannel getChannel() {

ios/Classes/InAppWebView.swift

@@ -112,7 +112,7 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
         
         configuration.userContentController = WKUserContentController()
         configuration.preferences = WKPreferences()
-        
+
         if (options?.transparentBackground)! {
             isOpaque = false
             backgroundColor = UIColor.clear
@@ -299,6 +299,18 @@ public class InAppWebView: WKWebView, UIScrollViewDelegate, WKUIDelegate, WKNavi
     
     func setOptions(newOptions: InAppWebViewOptions, newOptionsMap: [String: Any]) {
         
+        if newOptionsMap["transparentBackground"] != nil && options?.transparentBackground != newOptions.transparentBackground {
+            if newOptions.transparentBackground {
+                isOpaque = false
+                backgroundColor = UIColor.clear
+                scrollView.backgroundColor = UIColor.clear
+            } else {
+                isOpaque = true
+                backgroundColor = nil
+                scrollView.backgroundColor = UIColor(red: 1, green: 1, blue: 1, alpha: 1)
+            }
+        }
+        
         if newOptionsMap["disallowOverScroll"] != nil && options?.disallowOverScroll != newOptions.disallowOverScroll {
             if responds(to: #selector(getter: scrollView)) {
                 scrollView.bounces = !newOptions.disallowOverScroll

lib/flutter_inappbrowser.dart

@@ -179,6 +179,7 @@ class InAppBrowser {
   ///    - __closeOnCannotGoBack__: Set to `false` to not close the InAppBrowser when the user click on the back button and the WebView cannot go back to the history. The default value is `true`.
   ///    - __clearSessionCache__: Set to `true` to have the session cookie cache cleared before the new window is opened.
   ///    - __builtInZoomControls__: Set to `true` if the WebView should use its built-in zoom mechanisms. The default value is `false`.
+  ///    - __displayZoomControls__: Set to `true` if the WebView should display on-screen zoom controls when using the built-in zoom mechanisms. The default value is `false`.
   ///    - __supportZoom__: Set to `false` if the WebView should not support zooming using its on-screen zoom controls and gestures. The default value is `true`.
   ///    - __databaseEnabled__: Set to `true` if you want the database storage API is enabled. The default value is `false`.
   ///    - __domStorageEnabled__: Set to `true` if you want the DOM storage API is enabled. The default value is `false`.
@@ -582,11 +583,13 @@ class InAppWebViewInitialData {
 ///  - __javaScriptEnabled__: Set to `true` to enable JavaScript. The default value is `true`.
 ///  - __javaScriptCanOpenWindowsAutomatically__: Set to `true` to allow JavaScript open windows without user interaction. The default value is `false`.
 ///  - __mediaPlaybackRequiresUserGesture__: Set to `true` to prevent HTML5 audio or video from autoplaying. The default value is `true`.
+///  - __transparentBackground__: Set to `true` to make the background of the WebView transparent. If your app has a dark theme, this can prevent a white flash on initialization. The default value is `false`.
 ///
 ///  **Android** supports these additional options:
 ///
 ///  - __clearSessionCache__: Set to `true` to have the session cookie cache cleared before the new window is opened.
 ///  - __builtInZoomControls__: Set to `true` if the WebView should use its built-in zoom mechanisms. The default value is `false`.
+///  - __displayZoomControls__: Set to `true` if the WebView should display on-screen zoom controls when using the built-in zoom mechanisms. The default value is `false`.
 ///  - __supportZoom__: Set to `false` if the WebView should not support zooming using its on-screen zoom controls and gestures. The default value is `true`.
 ///  - __databaseEnabled__: Set to `true` if you want the database storage API is enabled. The default value is `false`.
 ///  - __domStorageEnabled__: Set to `true` if you want the DOM storage API is enabled. The default value is `false`.
@@ -652,6 +655,13 @@ class InAppWebView extends StatefulWidget {
   final Map<String, String> initialHeaders;
   ///Initial options that will be used.
   final Map<String, dynamic> initialOptions;
+  /// `gestureRecognizers` specifies which gestures should be consumed by the web view.
+  /// It is possible for other gesture recognizers to be competing with the web view on pointer
+  /// events, e.g if the web view is inside a [ListView] the [ListView] will want to handle
+  /// vertical drags. The web view will claim gestures that are recognized by any of the
+  /// recognizers on this list.
+  /// When `gestureRecognizers` is empty or null, the web view will only handle pointer events for gestures that
+  /// were not claimed by any other gesture recognizer.
   final Set<Factory<OneSequenceGestureRecognizer>> gestureRecognizers;
 
   const InAppWebView({
@@ -695,6 +705,7 @@ class _InAppWebViewState extends State<InAppWebView> {
     if (defaultTargetPlatform == TargetPlatform.android) {
       return GestureDetector(
         onLongPress: () {},
+        excludeFromSemantics: true,
         child: AndroidView(
           viewType: 'com.pichillilorenzo/flutter_inappwebview',
           onPlatformViewCreated: _onPlatformViewCreated,

pubspec.yaml

 name: flutter_inappbrowser
 description: A Flutter plugin that allows you to add an inline webview or open an in-app browser window (inspired by the popular cordova-plugin-inappbrowser).
-version: 1.1.3
+version: 1.2.0
 author: Lorenzo Pichilli <pichillilorenzo@gmail.com>
 homepage: https://github.com/pichillilorenzo/flutter_inappbrowser