chore: remove App plugin

android/capacitor/src/main/java/com/getcapacitor/App.java

@@ -0,0 +1,85 @@
+package com.getcapacitor;
+
+import androidx.annotation.Nullable;
+
+public class App {
+
+    /**
+     * Interface for callbacks when app status changes.
+     */
+    public interface AppStatusChangeListener {
+        void onAppStatusChanged(Boolean isActive);
+    }
+
+    /**
+     * Interface for callbacks when back button is pressed.
+     */
+    public interface BackButtonListener {
+        void onBackButton();
+    }
+
+    /**
+     * Interface for callbacks when app is restored with pending plugin call.
+     */
+    public interface AppRestoredListener {
+        void onAppRestored(PluginResult result);
+    }
+
+    @Nullable
+    private AppStatusChangeListener statusChangeListener;
+
+    private BackButtonListener backButtonListener;
+    private AppRestoredListener appRestoredListener;
+    private boolean isActive = false;
+
+    public boolean isActive() {
+        return isActive;
+    }
+
+    /**
+     * Set the object to receive callbacks.
+     * @param listener
+     */
+    public void setStatusChangeListener(@Nullable AppStatusChangeListener listener) {
+        this.statusChangeListener = listener;
+    }
+
+    /**
+     * Set the object to receive callbacks.
+     * @param listener
+     */
+    public void setBackButtonListener(@Nullable BackButtonListener listener) {
+        this.backButtonListener = listener;
+    }
+
+    /**
+     * Set the object to receive callbacks.
+     * @param listener
+     */
+    public void setAppRestoredListener(@Nullable AppRestoredListener listener) {
+        this.appRestoredListener = listener;
+    }
+
+    protected void fireRestoredResult(PluginResult result) {
+        if (appRestoredListener != null) {
+            appRestoredListener.onAppRestored(result);
+        }
+    }
+
+    public void fireChange(boolean isActive) {
+        this.isActive = isActive;
+        if (statusChangeListener != null) {
+            statusChangeListener.onAppStatusChanged(isActive);
+        }
+    }
+
+    public void fireBackButton() {
+        if (backButtonListener != null) {
+            backButtonListener.onBackButton();
+        }
+    }
+
+    public boolean hasBackButtonListeners() {
+        return backButtonListener != null;
+    }
+}

android/capacitor/src/main/java/com/getcapacitor/Bridge.java

@@ -15,7 +15,6 @@
 import android.webkit.ValueCallback;
 import android.webkit.WebSettings;
 import android.webkit.WebView;
-import com.getcapacitor.plugin.App;
 import com.getcapacitor.plugin.Geolocation;
 import com.getcapacitor.plugin.LocalNotifications;
 import com.getcapacitor.plugin.PushNotifications;
@@ -83,6 +82,7 @@ public class Bridge {
     public final CordovaInterfaceImpl cordovaInterface;
     private CordovaPreferences preferences;
     private BridgeWebViewClient webViewClient;
+    private App app;
 
     // Our MessageHandler for sending and receiving data to the WebView
     private final MessageHandler msgHandler;
@@ -123,6 +123,7 @@ public Bridge(
         CordovaPreferences preferences,
         JSONObject config
     ) {
+        this.app = new App();
         this.context = context;
         this.webView = webView;
         this.webViewClient = new BridgeWebViewClient(this);
@@ -157,6 +158,10 @@ public Bridge(
         this.loadWebView();
     }
 
+    public App getApp() {
+        return app;
+    }
+
     private void loadWebView() {
         appUrlConfig = this.config.getString("server.url");
         String[] appAllowNavigationConfig = this.config.getArray("server.allowNavigation");
@@ -379,7 +384,6 @@ private void initWebView() {
      * Register our core Plugin APIs
      */
     private void registerAllPlugins() {
-        this.registerPlugin(App.class);
         this.registerPlugin(BackgroundTask.class);
         this.registerPlugin(LocalNotifications.class);
         this.registerPlugin(Geolocation.class);
@@ -617,12 +621,6 @@ private JSInjector getJSInjector() {
         return null;
     }
 
-    protected void storeDanglingPluginResult(PluginCall call, PluginResult result) {
-        PluginHandle appHandle = getPlugin("App");
-        App appPlugin = (App) appHandle.getInstance();
-        appPlugin.fireRestoredResult(result);
-    }
-
     /**
      * Restore any saved bundle state data
      * @param savedInstanceState
@@ -805,18 +803,14 @@ public void onDestroy() {
     }
 
     public void onBackPressed() {
-        PluginHandle appHandle = getPlugin("App");
-        if (appHandle != null) {
-            App appPlugin = (App) appHandle.getInstance();
-
-            // If there are listeners, don't do the default action, as this means the user
-            // wants to override the back button
-            if (appPlugin.hasBackButtonListeners()) {
-                appPlugin.fireBackButton();
-            } else {
-                if (webView.canGoBack()) {
-                    webView.goBack();
-                }
+        // If there are listeners, don't do the default action, as this means the user
+        // wants to override the back button
+        if (app.hasBackButtonListeners()) {
+            app.fireBackButton();
+            triggerJSEvent("backbutton", "document");
+        } else {
+            if (webView.canGoBack()) {
+                webView.goBack();
             }
         }
     }

android/capacitor/src/main/java/com/getcapacitor/BridgeActivity.java

@@ -9,7 +9,6 @@
 import com.getcapacitor.android.R;
 import com.getcapacitor.cordova.MockCordovaInterfaceImpl;
 import com.getcapacitor.cordova.MockCordovaWebViewImpl;
-import com.getcapacitor.plugin.App;
 import java.util.ArrayList;
 import java.util.List;
 import org.apache.cordova.ConfigXmlParser;
@@ -90,22 +89,6 @@ public Bridge getBridge() {
         return this.bridge;
     }
 
-    /**
-     * Notify the App plugin that the current state changed
-     * @param isActive
-     */
-    private void fireAppStateChanged(boolean isActive) {
-        PluginHandle handle = bridge.getPlugin("App");
-        if (handle == null) {
-            return;
-        }
-
-        App appState = (App) handle.getInstance();
-        if (appState != null) {
-            appState.fireChange(isActive);
-        }
-    }
-
     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);
@@ -135,7 +118,7 @@ public void onRestart() {
     public void onResume() {
         super.onResume();
 
-        fireAppStateChanged(true);
+        bridge.getApp().fireChange(true);
 
         this.bridge.onResume();
 
@@ -163,7 +146,7 @@ public void onStop() {
 
         activityDepth = Math.max(0, activityDepth - 1);
         if (activityDepth == 0) {
-            fireAppStateChanged(false);
+            bridge.getApp().fireChange(false);
         }
 
         this.bridge.onStop();

android/capacitor/src/main/java/com/getcapacitor/MessageHandler.java

@@ -104,7 +104,7 @@ public void sendResponseMessage(PluginCall call, PluginResult successResult, Plu
                 final WebView webView = this.webView;
                 webView.post(() -> webView.evaluateJavascript(runScript, null));
             } else {
-                bridge.storeDanglingPluginResult(call, data);
+                bridge.getApp().fireRestoredResult(data);
             }
         } catch (Exception ex) {
             Logger.error("sendResponseMessage: error: " + ex);