fixed android InAppWebView and InAppBrowser dispose functions to correctly dispose resources

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/in_app_browser/InAppBrowserActivity.java

@@ -13,30 +13,27 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
-import android.view.ViewGroup;
-import android.webkit.WebChromeClient;
 import android.webkit.WebView;
-import android.webkit.WebViewClient;
 import android.widget.ProgressBar;
+import android.widget.RelativeLayout;
 import android.widget.SearchView;
 
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AppCompatActivity;
 
-import com.pichillilorenzo.flutter_inappwebview.find_interaction.FindInteractionController;
-import com.pichillilorenzo.flutter_inappwebview.types.Disposable;
 import com.pichillilorenzo.flutter_inappwebview.R;
 import com.pichillilorenzo.flutter_inappwebview.Util;
+import com.pichillilorenzo.flutter_inappwebview.find_interaction.FindInteractionController;
 import com.pichillilorenzo.flutter_inappwebview.pull_to_refresh.PullToRefreshChannelDelegate;
-import com.pichillilorenzo.flutter_inappwebview.webview.in_app_webview.InAppWebView;
-import com.pichillilorenzo.flutter_inappwebview.webview.in_app_webview.InAppWebViewChromeClient;
-import com.pichillilorenzo.flutter_inappwebview.webview.in_app_webview.InAppWebViewSettings;
-import com.pichillilorenzo.flutter_inappwebview.webview.WebViewChannelDelegate;
 import com.pichillilorenzo.flutter_inappwebview.pull_to_refresh.PullToRefreshLayout;
 import com.pichillilorenzo.flutter_inappwebview.pull_to_refresh.PullToRefreshSettings;
+import com.pichillilorenzo.flutter_inappwebview.types.Disposable;
 import com.pichillilorenzo.flutter_inappwebview.types.URLRequest;
 import com.pichillilorenzo.flutter_inappwebview.types.UserScript;
+import com.pichillilorenzo.flutter_inappwebview.webview.WebViewChannelDelegate;
+import com.pichillilorenzo.flutter_inappwebview.webview.in_app_webview.InAppWebView;
+import com.pichillilorenzo.flutter_inappwebview.webview.in_app_webview.InAppWebViewSettings;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -538,19 +535,12 @@ public class InAppBrowserActivity extends AppCompatActivity implements InAppBrow
               manager.plugin.activityPluginBinding != null && webView.inAppWebViewChromeClient != null) {
         manager.plugin.activityPluginBinding.removeActivityResultListener(webView.inAppWebViewChromeClient);
       }
-      if (webView.channelDelegate != null) {
+      RelativeLayout containerView = (RelativeLayout) findViewById(R.id.container);
-        webView.channelDelegate.dispose();
+      if (containerView != null) {
+        containerView.removeAllViews();
       }
-      webView.setWebChromeClient(new WebChromeClient());
-      webView.setWebViewClient(new WebViewClient() {
-        public void onPageFinished(WebView view, String url) {
       webView.dispose();
-          webView.destroy();
       webView = null;
-          manager = null;
-        }
-      });
-      webView.loadUrl("about:blank");
       finish();
     }
   }

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

@@ -158,48 +158,14 @@ public class FlutterWebView implements PlatformWebView {
   @Override
   public void dispose() {
     if (keepAliveId == null && webView != null) {
-      if (webView.channelDelegate != null) {
-        webView.channelDelegate.dispose();
-      }
-      webView.removeJavascriptInterface(JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME);
-      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && WebViewFeature.isFeatureSupported(WebViewFeature.WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE)) {
-        WebViewCompat.setWebViewRenderProcessClient(webView, null);
-      }
-      webView.setWebChromeClient(new WebChromeClient());
-      webView.setWebViewClient(new WebViewClient() {
-        @Override
-        public void onPageFinished(WebView view, String url) {
-          if (webView.inAppWebViewRenderProcessClient != null) {
-            webView.inAppWebViewRenderProcessClient.dispose();
-          }
-          if (webView.inAppWebViewChromeClient != null) {
-            webView.inAppWebViewChromeClient.dispose();
-          }
-          if (webView.inAppWebViewClientCompat != null) {
-            webView.inAppWebViewClientCompat.dispose();
-          }
-          if (webView.inAppWebViewClient != null) {
-            webView.inAppWebViewClient.dispose();
-          }
-          if (webView.javaScriptBridgeInterface != null) {
-            webView.javaScriptBridgeInterface.dispose();
-          }
-          if (webView != null) {
       webView.dispose();
-            webView.destroy();
       webView = null;
-          }
 
       if (pullToRefreshLayout != null) {
         pullToRefreshLayout.dispose();
         pullToRefreshLayout = null;
       }
     }
-      });
-      WebSettings settings = webView.getSettings();
-      settings.setJavaScriptEnabled(false);
-      webView.loadUrl("about:blank");
-    }
   }
 
   @Override

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

@@ -45,9 +45,11 @@ import android.webkit.DownloadListener;
 import android.webkit.URLUtil;
 import android.webkit.ValueCallback;
 import android.webkit.WebBackForwardList;
+import android.webkit.WebChromeClient;
 import android.webkit.WebHistoryItem;
 import android.webkit.WebSettings;
 import android.webkit.WebStorage;
+import android.webkit.WebView;
 import android.webkit.WebViewClient;
 import android.widget.HorizontalScrollView;
 import android.widget.LinearLayout;
@@ -80,7 +82,6 @@ import com.pichillilorenzo.flutter_inappwebview.plugin_scripts_js.PluginScriptsU
 import com.pichillilorenzo.flutter_inappwebview.plugin_scripts_js.PrintJS;
 import com.pichillilorenzo.flutter_inappwebview.plugin_scripts_js.PromisePolyfillJS;
 import com.pichillilorenzo.flutter_inappwebview.print_job.PrintJobController;
-import com.pichillilorenzo.flutter_inappwebview.print_job.PrintJobManager;
 import com.pichillilorenzo.flutter_inappwebview.print_job.PrintJobSettings;
 import com.pichillilorenzo.flutter_inappwebview.pull_to_refresh.PullToRefreshLayout;
 import com.pichillilorenzo.flutter_inappwebview.types.ContentWorld;
@@ -107,6 +108,7 @@ import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.UUID;
 import java.util.regex.Pattern;
 
@@ -2002,6 +2004,23 @@ final public class InAppWebView extends InputAwareWebView implements InAppWebVie
 
   @Override
   public void dispose() {
+    if (channelDelegate != null) {
+      channelDelegate.dispose();
+      channelDelegate = null;
+    }
+    super.dispose();
+    WebSettings settings = getSettings();
+    settings.setJavaScriptEnabled(false);
+    removeJavascriptInterface(JavaScriptBridgeJS.JAVASCRIPT_BRIDGE_NAME);
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && WebViewFeature.isFeatureSupported(WebViewFeature.WEB_VIEW_RENDERER_CLIENT_BASIC_USAGE)) {
+      WebViewCompat.setWebViewRenderProcessClient(this, null);
+    }
+    setWebChromeClient(new WebChromeClient());
+    setWebViewClient(new WebViewClient() {
+      public void onPageFinished(WebView view, String url) {
+        destroy();
+      }
+    });
     userContentController.dispose();
     if (findInteractionController != null) {
       findInteractionController.dispose();
@@ -2026,14 +2045,28 @@ final public class InAppWebView extends InputAwareWebView implements InAppWebVie
     callAsyncJavaScriptCallbacks.clear();
     evaluateJavaScriptContentWorldCallbacks.clear();
     inAppBrowserDelegate = null;
-    inAppWebViewChromeClient = null;
+    if (inAppWebViewRenderProcessClient != null) {
-    inAppWebViewClientCompat = null;
+      inAppWebViewRenderProcessClient.dispose();
-    inAppWebViewClient = null;
-    javaScriptBridgeInterface = null;
       inAppWebViewRenderProcessClient = null;
-    channelDelegate = null;
+    }
+    if (inAppWebViewChromeClient != null) {
+      inAppWebViewChromeClient.dispose();
+      inAppWebViewChromeClient = null;
+    }
+    if (inAppWebViewClientCompat != null) {
+      inAppWebViewClientCompat.dispose();
+      inAppWebViewClientCompat = null;
+    }
+    if (inAppWebViewClient != null) {
+      inAppWebViewClient.dispose();
+      inAppWebViewClient = null;
+    }
+    if (javaScriptBridgeInterface != null) {
+      javaScriptBridgeInterface.dispose();
+      javaScriptBridgeInterface = null;
+    }
     plugin = null;
-    super.dispose();
+    loadUrl("about:blank");
   }
 
   @Override

android/src/main/java/com/pichillilorenzo/flutter_inappwebview/webview/in_app_webview/InAppWebViewChromeClient.java

@@ -67,7 +67,9 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 import io.flutter.plugin.common.PluginRegistry;
 
@@ -81,6 +83,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
   private static final int PICKER = 1;
   private static final int PICKER_LEGACY = 3;
   final String DEFAULT_MIME_TYPES = "*/*";
+  final Map<DialogInterface, JsResult> dialogs = new HashMap();
 
   protected static final FrameLayout.LayoutParams FULLSCREEN_LAYOUT_PARAMS = new FrameLayout.LayoutParams(
           ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, Gravity.CENTER);
@@ -276,6 +279,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onClick(DialogInterface dialog, int which) {
         result.confirm();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     };
 
@@ -297,10 +301,12 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onCancel(DialogInterface dialog) {
         result.cancel();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     });
 
     AlertDialog alertDialog = alertDialogBuilder.create();
+    dialogs.put(alertDialog, result);
     alertDialog.show();
   }
 
@@ -360,6 +366,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onClick(DialogInterface dialog, int which) {
         result.confirm();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     };
     DialogInterface.OnClickListener cancelClickListener = new DialogInterface.OnClickListener() {
@@ -367,6 +374,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onClick(DialogInterface dialog, int which) {
         result.cancel();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     };
 
@@ -393,10 +401,12 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onCancel(DialogInterface dialog) {
         result.cancel();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     });
 
     AlertDialog alertDialog = alertDialogBuilder.create();
+    dialogs.put(alertDialog, result);
     alertDialog.show();
   }
 
@@ -476,6 +486,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
         String text = input.getText().toString();
         result.confirm(finalValue != null ? finalValue : text);
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     };
     DialogInterface.OnClickListener cancelClickListener = new DialogInterface.OnClickListener() {
@@ -483,6 +494,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onClick(DialogInterface dialog, int which) {
         result.cancel();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     };
 
@@ -509,11 +521,13 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onCancel(DialogInterface dialog) {
         result.cancel();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     });
 
     AlertDialog alertDialog = alertDialogBuilder.create();
     alertDialog.setView(layout);
+    dialogs.put(alertDialog, result);
     alertDialog.show();
   }
 
@@ -573,6 +587,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onClick(DialogInterface dialog, int which) {
         result.confirm();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     };
     DialogInterface.OnClickListener cancelClickListener = new DialogInterface.OnClickListener() {
@@ -580,6 +595,7 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onClick(DialogInterface dialog, int which) {
         result.cancel();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     };
 
@@ -606,10 +622,12 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
       public void onCancel(DialogInterface dialog) {
         result.cancel();
         dialog.dismiss();
+        dialogs.remove(dialog);
       }
     });
 
     AlertDialog alertDialog = alertDialogBuilder.create();
+    dialogs.put(alertDialog, result);
     alertDialog.show();
   }
 
@@ -1296,6 +1314,11 @@ public class InAppWebViewChromeClient extends WebChromeClient implements PluginR
   }
 
   public void dispose() {
+    for (Map.Entry<DialogInterface, JsResult> dialog : dialogs.entrySet()) {
+      dialog.getValue().cancel();
+      dialog.getKey().dismiss();
+    }
+    dialogs.clear();
     if (plugin != null && plugin.activityPluginBinding != null) {
       plugin.activityPluginBinding.removeActivityResultListener(this);
     }