shell/platform/android/io/flutter/embedding/engine/FlutterEnginePluginRegistry.java

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package io.flutter.embedding.engine;

import android.app.Activity;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.ContentProvider;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.lifecycle.Lifecycle;
import io.flutter.Log;
import io.flutter.embedding.engine.loader.FlutterLoader;
import io.flutter.embedding.engine.plugins.FlutterPlugin;
import io.flutter.embedding.engine.plugins.PluginRegistry;
import io.flutter.embedding.engine.plugins.activity.ActivityAware;
import io.flutter.embedding.engine.plugins.activity.ActivityControlSurface;
import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
import io.flutter.embedding.engine.plugins.broadcastreceiver.BroadcastReceiverAware;
import io.flutter.embedding.engine.plugins.broadcastreceiver.BroadcastReceiverControlSurface;
import io.flutter.embedding.engine.plugins.broadcastreceiver.BroadcastReceiverPluginBinding;
import io.flutter.embedding.engine.plugins.contentprovider.ContentProviderAware;
import io.flutter.embedding.engine.plugins.contentprovider.ContentProviderControlSurface;
import io.flutter.embedding.engine.plugins.contentprovider.ContentProviderPluginBinding;
import io.flutter.embedding.engine.plugins.lifecycle.HiddenLifecycleReference;
import io.flutter.embedding.engine.plugins.service.ServiceAware;
import io.flutter.embedding.engine.plugins.service.ServiceControlSurface;
import io.flutter.embedding.engine.plugins.service.ServicePluginBinding;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

class FlutterEnginePluginRegistry
    implements PluginRegistry,
        ActivityControlSurface,
        ServiceControlSurface,
        BroadcastReceiverControlSurface,
        ContentProviderControlSurface {
  private static final String TAG = "FlutterEnginePluginRegistry";

  // PluginRegistry
  @NonNull
  private final Map<Class<? extends FlutterPlugin>, FlutterPlugin> plugins = new HashMap<>();

  // Standard FlutterPlugin
  @NonNull private final FlutterEngine flutterEngine;
  @NonNull private final FlutterPlugin.FlutterPluginBinding pluginBinding;

  // ActivityAware
  @NonNull
  private final Map<Class<? extends FlutterPlugin>, ActivityAware> activityAwarePlugins =
      new HashMap<>();

  @Nullable private Activity activity;
  @Nullable private FlutterEngineActivityPluginBinding activityPluginBinding;
  private boolean isWaitingForActivityReattachment = false;

  // ServiceAware
  @NonNull
  private final Map<Class<? extends FlutterPlugin>, ServiceAware> serviceAwarePlugins =
      new HashMap<>();

  @Nullable private Service service;
  @Nullable private FlutterEngineServicePluginBinding servicePluginBinding;

  // BroadcastReceiver
  @NonNull
  private final Map<Class<? extends FlutterPlugin>, BroadcastReceiverAware>
      broadcastReceiverAwarePlugins = new HashMap<>();

  @Nullable private BroadcastReceiver broadcastReceiver;
  @Nullable private FlutterEngineBroadcastReceiverPluginBinding broadcastReceiverPluginBinding;

  // ContentProvider
  @NonNull
  private final Map<Class<? extends FlutterPlugin>, ContentProviderAware>
      contentProviderAwarePlugins = new HashMap<>();

  @Nullable private ContentProvider contentProvider;
  @Nullable private FlutterEngineContentProviderPluginBinding contentProviderPluginBinding;

  FlutterEnginePluginRegistry(
      @NonNull Context appContext,
      @NonNull FlutterEngine flutterEngine,
      @NonNull FlutterLoader flutterLoader) {
    this.flutterEngine = flutterEngine;
    pluginBinding =
        new FlutterPlugin.FlutterPluginBinding(
            appContext,
            flutterEngine,
            flutterEngine.getDartExecutor(),
            flutterEngine.getRenderer(),
            flutterEngine.getPlatformViewsController().getRegistry(),
            new DefaultFlutterAssets(flutterLoader));
  }

  public void destroy() {
    Log.v(TAG, "Destroying.");
    // Detach from any Android component that we may currently be attached to, e.g., Activity,
    // Service,
    // BroadcastReceiver, ContentProvider. This must happen before removing all plugins so that the
    // plugins have an opportunity to clean up references as a result of component detachment.
    detachFromAndroidComponent();

    // Remove all registered plugins.
    removeAll();
  }

  @Override
  public void add(@NonNull FlutterPlugin plugin) {
    if (has(plugin.getClass())) {
      Log.w(
          TAG,
          "Attempted to register plugin ("
              + plugin
              + ") but it was "
              + "already registered with this FlutterEngine ("
              + flutterEngine
              + ").");
      return;
    }

    Log.v(TAG, "Adding plugin: " + plugin);
    // Add the plugin to our generic set of plugins and notify the plugin
    // that is has been attached to an engine.
    plugins.put(plugin.getClass(), plugin);
    plugin.onAttachedToEngine(pluginBinding);

    // For ActivityAware plugins, add the plugin to our set of ActivityAware
    // plugins, and if this engine is currently attached to an Activity,
    // notify the ActivityAware plugin that it is now attached to an Activity.
    if (plugin instanceof ActivityAware) {
      ActivityAware activityAware = (ActivityAware) plugin;
      activityAwarePlugins.put(plugin.getClass(), activityAware);

      if (isAttachedToActivity()) {
        activityAware.onAttachedToActivity(activityPluginBinding);
      }
    }

    // For ServiceAware plugins, add the plugin to our set of ServiceAware
    // plugins, and if this engine is currently attached to a Service,
    // notify the ServiceAware plugin that it is now attached to a Service.
    if (plugin instanceof ServiceAware) {
      ServiceAware serviceAware = (ServiceAware) plugin;
      serviceAwarePlugins.put(plugin.getClass(), serviceAware);

      if (isAttachedToService()) {
        serviceAware.onAttachedToService(servicePluginBinding);
      }
    }

    // For BroadcastReceiverAware plugins, add the plugin to our set of BroadcastReceiverAware
    // plugins, and if this engine is currently attached to a BroadcastReceiver,
    // notify the BroadcastReceiverAware plugin that it is now attached to a BroadcastReceiver.
    if (plugin instanceof BroadcastReceiverAware) {
      BroadcastReceiverAware broadcastReceiverAware = (BroadcastReceiverAware) plugin;
      broadcastReceiverAwarePlugins.put(plugin.getClass(), broadcastReceiverAware);

      if (isAttachedToBroadcastReceiver()) {
        broadcastReceiverAware.onAttachedToBroadcastReceiver(broadcastReceiverPluginBinding);
      }
    }

    // For ContentProviderAware plugins, add the plugin to our set of ContentProviderAware
    // plugins, and if this engine is currently attached to a ContentProvider,
    // notify the ContentProviderAware plugin that it is now attached to a ContentProvider.
    if (plugin instanceof ContentProviderAware) {
      ContentProviderAware contentProviderAware = (ContentProviderAware) plugin;
      contentProviderAwarePlugins.put(plugin.getClass(), contentProviderAware);

      if (isAttachedToContentProvider()) {
        contentProviderAware.onAttachedToContentProvider(contentProviderPluginBinding);
      }
    }
  }

  @Override
  public void add(@NonNull Set<FlutterPlugin> plugins) {
    for (FlutterPlugin plugin : plugins) {
      add(plugin);
    }
  }

  @Override
  public boolean has(@NonNull Class<? extends FlutterPlugin> pluginClass) {
    return plugins.containsKey(pluginClass);
  }

  @Override
  public FlutterPlugin get(@NonNull Class<? extends FlutterPlugin> pluginClass) {
    return plugins.get(pluginClass);
  }

  @Override
  public void remove(@NonNull Class<? extends FlutterPlugin> pluginClass) {
    FlutterPlugin plugin = plugins.get(pluginClass);
    if (plugin != null) {
      Log.v(TAG, "Removing plugin: " + plugin);
      // For ActivityAware plugins, notify the plugin that it is detached from
      // an Activity if an Activity is currently attached to this engine. Then
      // remove the plugin from our set of ActivityAware plugins.
      if (plugin instanceof ActivityAware) {
        if (isAttachedToActivity()) {
          ActivityAware activityAware = (ActivityAware) plugin;
          activityAware.onDetachedFromActivity();
        }
        activityAwarePlugins.remove(pluginClass);
      }

      // For ServiceAware plugins, notify the plugin that it is detached from
      // a Service if a Service is currently attached to this engine. Then
      // remove the plugin from our set of ServiceAware plugins.
      if (plugin instanceof ServiceAware) {
        if (isAttachedToService()) {
          ServiceAware serviceAware = (ServiceAware) plugin;
          serviceAware.onDetachedFromService();
        }
        serviceAwarePlugins.remove(pluginClass);
      }

      // For BroadcastReceiverAware plugins, notify the plugin that it is detached from
      // a BroadcastReceiver if a BroadcastReceiver is currently attached to this engine. Then
      // remove the plugin from our set of BroadcastReceiverAware plugins.
      if (plugin instanceof BroadcastReceiverAware) {
        if (isAttachedToBroadcastReceiver()) {
          BroadcastReceiverAware broadcastReceiverAware = (BroadcastReceiverAware) plugin;
          broadcastReceiverAware.onDetachedFromBroadcastReceiver();
        }
        broadcastReceiverAwarePlugins.remove(pluginClass);
      }

      // For ContentProviderAware plugins, notify the plugin that it is detached from
      // a ContentProvider if a ContentProvider is currently attached to this engine. Then
      // remove the plugin from our set of ContentProviderAware plugins.
      if (plugin instanceof ContentProviderAware) {
        if (isAttachedToContentProvider()) {
          ContentProviderAware contentProviderAware = (ContentProviderAware) plugin;
          contentProviderAware.onDetachedFromContentProvider();
        }
        contentProviderAwarePlugins.remove(pluginClass);
      }

      // Notify the plugin that is now detached from this engine. Then remove
      // it from our set of generic plugins.
      plugin.onDetachedFromEngine(pluginBinding);
      plugins.remove(pluginClass);
    }
  }

  @Override
  public void remove(@NonNull Set<Class<? extends FlutterPlugin>> pluginClasses) {
    for (Class<? extends FlutterPlugin> pluginClass : pluginClasses) {
      remove(pluginClass);
    }
  }

  @Override
  public void removeAll() {
    // We copy the keys to a new set so that we can mutate the set while using
    // the keys.
    remove(new HashSet<>(plugins.keySet()));
    plugins.clear();
  }

  private void detachFromAndroidComponent() {
    if (isAttachedToActivity()) {
      detachFromActivity();
    } else if (isAttachedToService()) {
      detachFromService();
    } else if (isAttachedToBroadcastReceiver()) {
      detachFromBroadcastReceiver();
    } else if (isAttachedToContentProvider()) {
      detachFromContentProvider();
    }
  }

  // -------- Start ActivityControlSurface -------
  private boolean isAttachedToActivity() {
    return activity != null;
  }

  @Override
  public void attachToActivity(@NonNull Activity activity, @NonNull Lifecycle lifecycle) {
    Log.v(
        TAG,
        "Attaching to an Activity: "
            + activity
            + "."
            + (isWaitingForActivityReattachment ? " This is after a config change." : ""));
    // If we were already attached to an Android component, detach from it.
    detachFromAndroidComponent();

    this.activity = activity;
    this.activityPluginBinding = new FlutterEngineActivityPluginBinding(activity, lifecycle);

    // Activate the PlatformViewsController. This must happen before any plugins attempt
    // to use it, otherwise an error stack trace will appear that says there is no
    // flutter/platform_views channel.
    flutterEngine
        .getPlatformViewsController()
        .attach(activity, flutterEngine.getRenderer(), flutterEngine.getDartExecutor());

    // Notify all ActivityAware plugins that they are now attached to a new Activity.
    for (ActivityAware activityAware : activityAwarePlugins.values()) {
      if (isWaitingForActivityReattachment) {
        activityAware.onReattachedToActivityForConfigChanges(activityPluginBinding);
      } else {
        activityAware.onAttachedToActivity(activityPluginBinding);
      }
    }
    isWaitingForActivityReattachment = false;
  }

  @Override
  public void detachFromActivityForConfigChanges() {
    if (isAttachedToActivity()) {
      Log.v(TAG, "Detaching from an Activity for config changes: " + activity);
      isWaitingForActivityReattachment = true;

      for (ActivityAware activityAware : activityAwarePlugins.values()) {
        activityAware.onDetachedFromActivityForConfigChanges();
      }

      // Deactivate PlatformViewsController.
      flutterEngine.getPlatformViewsController().detach();

      activity = null;
      activityPluginBinding = null;
    } else {
      Log.e(TAG, "Attempted to detach plugins from an Activity when no Activity was attached.");
    }
  }

  @Override
  public void detachFromActivity() {
    if (isAttachedToActivity()) {
      Log.v(TAG, "Detaching from an Activity: " + activity);
      for (ActivityAware activityAware : activityAwarePlugins.values()) {
        activityAware.onDetachedFromActivity();
      }

      // Deactivate PlatformViewsController.
      flutterEngine.getPlatformViewsController().detach();

      activity = null;
      activityPluginBinding = null;
    } else {
      Log.e(TAG, "Attempted to detach plugins from an Activity when no Activity was attached.");
    }
  }

  @Override
  public boolean onRequestPermissionsResult(
      int requestCode, @NonNull String[] permissions, @NonNull int[] grantResult) {
    Log.v(TAG, "Forwarding onRequestPermissionsResult() to plugins.");
    if (isAttachedToActivity()) {
      return activityPluginBinding.onRequestPermissionsResult(
          requestCode, permissions, grantResult);
    } else {
      Log.e(
          TAG,
          "Attempted to notify ActivityAware plugins of onRequestPermissionsResult, but no Activity was attached.");
      return false;
    }
  }

  @Override
  public boolean onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    Log.v(TAG, "Forwarding onActivityResult() to plugins.");
    if (isAttachedToActivity()) {
      return activityPluginBinding.onActivityResult(requestCode, resultCode, data);
    } else {
      Log.e(
          TAG,
          "Attempted to notify ActivityAware plugins of onActivityResult, but no Activity was attached.");
      return false;
    }
  }

  @Override
  public void onNewIntent(@NonNull Intent intent) {
    Log.v(TAG, "Forwarding onNewIntent() to plugins.");
    if (isAttachedToActivity()) {
      activityPluginBinding.onNewIntent(intent);
    } else {
      Log.e(
          TAG,
          "Attempted to notify ActivityAware plugins of onNewIntent, but no Activity was attached.");
    }
  }

  @Override
  public void onUserLeaveHint() {
    Log.v(TAG, "Forwarding onUserLeaveHint() to plugins.");
    if (isAttachedToActivity()) {
      activityPluginBinding.onUserLeaveHint();
    } else {
      Log.e(
          TAG,
          "Attempted to notify ActivityAware plugins of onUserLeaveHint, but no Activity was attached.");
    }
  }

  @Override
  public void onSaveInstanceState(@NonNull Bundle bundle) {
    Log.v(TAG, "Forwarding onSaveInstanceState() to plugins.");
    if (isAttachedToActivity()) {
      activityPluginBinding.onSaveInstanceState(bundle);
    } else {
      Log.e(
          TAG,
          "Attempted to notify ActivityAware plugins of onSaveInstanceState, but no Activity was attached.");
    }
  }

  @Override
  public void onRestoreInstanceState(@Nullable Bundle bundle) {
    Log.v(TAG, "Forwarding onRestoreInstanceState() to plugins.");
    if (isAttachedToActivity()) {
      activityPluginBinding.onRestoreInstanceState(bundle);
    } else {
      Log.e(
          TAG,
          "Attempted to notify ActivityAware plugins of onRestoreInstanceState, but no Activity was attached.");
    }
  }
  // ------- End ActivityControlSurface -----

  // ----- Start ServiceControlSurface ----
  private boolean isAttachedToService() {
    return service != null;
  }

  @Override
  public void attachToService(
      @NonNull Service service, @Nullable Lifecycle lifecycle, boolean isForeground) {
    Log.v(TAG, "Attaching to a Service: " + service);
    // If we were already attached to an Android component, detach from it.
    detachFromAndroidComponent();

    this.service = service;
    this.servicePluginBinding = new FlutterEngineServicePluginBinding(service, lifecycle);

    // Notify all ServiceAware plugins that they are now attached to a new Service.
    for (ServiceAware serviceAware : serviceAwarePlugins.values()) {
      serviceAware.onAttachedToService(servicePluginBinding);
    }
  }

  @Override
  public void detachFromService() {
    if (isAttachedToService()) {
      Log.v(TAG, "Detaching from a Service: " + service);
      // Notify all ServiceAware plugins that they are no longer attached to a Service.
      for (ServiceAware serviceAware : serviceAwarePlugins.values()) {
        serviceAware.onDetachedFromService();
      }

      service = null;
      servicePluginBinding = null;
    } else {
      Log.e(TAG, "Attempted to detach plugins from a Service when no Service was attached.");
    }
  }

  @Override
  public void onMoveToForeground() {
    if (isAttachedToService()) {
      Log.v(TAG, "Attached Service moved to foreground.");
      servicePluginBinding.onMoveToForeground();
    }
  }

  @Override
  public void onMoveToBackground() {
    if (isAttachedToService()) {
      Log.v(TAG, "Attached Service moved to background.");
      servicePluginBinding.onMoveToBackground();
    }
  }
  // ----- End ServiceControlSurface ---

  // ----- Start BroadcastReceiverControlSurface ---
  private boolean isAttachedToBroadcastReceiver() {
    return broadcastReceiver != null;
  }

  @Override
  public void attachToBroadcastReceiver(
      @NonNull BroadcastReceiver broadcastReceiver, @NonNull Lifecycle lifecycle) {
    Log.v(TAG, "Attaching to BroadcastReceiver: " + broadcastReceiver);
    // If we were already attached to an Android component, detach from it.
    detachFromAndroidComponent();

    this.broadcastReceiver = broadcastReceiver;
    this.broadcastReceiverPluginBinding =
        new FlutterEngineBroadcastReceiverPluginBinding(broadcastReceiver);
    // TODO(mattcarroll): resolve possibility of different lifecycles between this and engine
    // attachment

    // Notify all BroadcastReceiverAware plugins that they are now attached to a new
    // BroadcastReceiver.
    for (BroadcastReceiverAware broadcastReceiverAware : broadcastReceiverAwarePlugins.values()) {
      broadcastReceiverAware.onAttachedToBroadcastReceiver(broadcastReceiverPluginBinding);
    }
  }

  @Override
  public void detachFromBroadcastReceiver() {
    if (isAttachedToBroadcastReceiver()) {
      Log.v(TAG, "Detaching from BroadcastReceiver: " + broadcastReceiver);
      // Notify all BroadcastReceiverAware plugins that they are no longer attached to a
      // BroadcastReceiver.
      for (BroadcastReceiverAware broadcastReceiverAware : broadcastReceiverAwarePlugins.values()) {
        broadcastReceiverAware.onDetachedFromBroadcastReceiver();
      }
    } else {
      Log.e(
          TAG,
          "Attempted to detach plugins from a BroadcastReceiver when no BroadcastReceiver was attached.");
    }
  }
  // ----- End BroadcastReceiverControlSurface ----

  // ----- Start ContentProviderControlSurface ----
  private boolean isAttachedToContentProvider() {
    return contentProvider != null;
  }

  @Override
  public void attachToContentProvider(
      @NonNull ContentProvider contentProvider, @NonNull Lifecycle lifecycle) {
    Log.v(TAG, "Attaching to ContentProvider: " + contentProvider);
    // If we were already attached to an Android component, detach from it.
    detachFromAndroidComponent();

    this.contentProvider = contentProvider;
    this.contentProviderPluginBinding =
        new FlutterEngineContentProviderPluginBinding(contentProvider);
    // TODO(mattcarroll): resolve possibility of different lifecycles between this and engine
    // attachment

    // Notify all ContentProviderAware plugins that they are now attached to a new ContentProvider.
    for (ContentProviderAware contentProviderAware : contentProviderAwarePlugins.values()) {
      contentProviderAware.onAttachedToContentProvider(contentProviderPluginBinding);
    }
  }

  @Override
  public void detachFromContentProvider() {
    if (isAttachedToContentProvider()) {
      Log.v(TAG, "Detaching from ContentProvider: " + contentProvider);
      // Notify all ContentProviderAware plugins that they are no longer attached to a
      // ContentProvider.
      for (ContentProviderAware contentProviderAware : contentProviderAwarePlugins.values()) {
        contentProviderAware.onDetachedFromContentProvider();
      }
    } else {
      Log.e(
          TAG,
          "Attempted to detach plugins from a ContentProvider when no ContentProvider was attached.");
    }
  }
  // ----- End ContentProviderControlSurface -----

  private static class DefaultFlutterAssets implements FlutterPlugin.FlutterAssets {
    final FlutterLoader flutterLoader;

    private DefaultFlutterAssets(@NonNull FlutterLoader flutterLoader) {
      this.flutterLoader = flutterLoader;
    }

    public String getAssetFilePathByName(@NonNull String assetFileName) {
      return flutterLoader.getLookupKeyForAsset(assetFileName);
    }

    public String getAssetFilePathByName(
        @NonNull String assetFileName, @NonNull String packageName) {
      return flutterLoader.getLookupKeyForAsset(assetFileName, packageName);
    }

    public String getAssetFilePathBySubpath(@NonNull String assetSubpath) {
      return flutterLoader.getLookupKeyForAsset(assetSubpath);
    }

    public String getAssetFilePathBySubpath(
        @NonNull String assetSubpath, @NonNull String packageName) {
      return flutterLoader.getLookupKeyForAsset(assetSubpath, packageName);
    }
  }

  private static class FlutterEngineActivityPluginBinding implements ActivityPluginBinding {
    @NonNull private final Activity activity;
    @NonNull private final HiddenLifecycleReference hiddenLifecycleReference;

    @NonNull
    private final Set<io.flutter.plugin.common.PluginRegistry.RequestPermissionsResultListener>
        onRequestPermissionsResultListeners = new HashSet<>();

    @NonNull
    private final Set<io.flutter.plugin.common.PluginRegistry.ActivityResultListener>
        onActivityResultListeners = new HashSet<>();

    @NonNull
    private final Set<io.flutter.plugin.common.PluginRegistry.NewIntentListener>
        onNewIntentListeners = new HashSet<>();

    @NonNull
    private final Set<io.flutter.plugin.common.PluginRegistry.UserLeaveHintListener>
        onUserLeaveHintListeners = new HashSet<>();

    @NonNull
    private final Set<OnSaveInstanceStateListener> onSaveInstanceStateListeners = new HashSet<>();

    public FlutterEngineActivityPluginBinding(
        @NonNull Activity activity, @NonNull Lifecycle lifecycle) {
      this.activity = activity;
      this.hiddenLifecycleReference = new HiddenLifecycleReference(lifecycle);
    }

    @Override
    @NonNull
    public Activity getActivity() {
      return activity;
    }

    @NonNull
    @Override
    public Object getLifecycle() {
      return hiddenLifecycleReference;
    }

    @Override
    public void addRequestPermissionsResultListener(
        @NonNull
            io.flutter.plugin.common.PluginRegistry.RequestPermissionsResultListener listener) {
      onRequestPermissionsResultListeners.add(listener);
    }

    @Override
    public void removeRequestPermissionsResultListener(
        @NonNull
            io.flutter.plugin.common.PluginRegistry.RequestPermissionsResultListener listener) {
      onRequestPermissionsResultListeners.remove(listener);
    }

    /**
     * Invoked by the {@link FlutterEngine} that owns this {@code ActivityPluginBinding} when its
     * associated {@link Activity} has its {@code onRequestPermissionsResult(...)} method invoked.
     */
    boolean onRequestPermissionsResult(
        int requestCode, @NonNull String[] permissions, @NonNull int[] grantResult) {
      boolean didConsumeResult = false;
      for (io.flutter.plugin.common.PluginRegistry.RequestPermissionsResultListener listener :
          onRequestPermissionsResultListeners) {
        didConsumeResult =
            listener.onRequestPermissionsResult(requestCode, permissions, grantResult)
                || didConsumeResult;
      }
      return didConsumeResult;
    }

    @Override
    public void addActivityResultListener(
        @NonNull io.flutter.plugin.common.PluginRegistry.ActivityResultListener listener) {
      onActivityResultListeners.add(listener);
    }

    @Override
    public void removeActivityResultListener(
        @NonNull io.flutter.plugin.common.PluginRegistry.ActivityResultListener listener) {
      onActivityResultListeners.remove(listener);
    }

    /**
     * Invoked by the {@link FlutterEngine} that owns this {@code ActivityPluginBinding} when its
     * associated {@link Activity} has its {@code onActivityResult(...)} method invoked.
     */
    boolean onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
      boolean didConsumeResult = false;
      for (io.flutter.plugin.common.PluginRegistry.ActivityResultListener listener :
          new HashSet<>(onActivityResultListeners)) {
        didConsumeResult =
            listener.onActivityResult(requestCode, resultCode, data) || didConsumeResult;
      }
      return didConsumeResult;
    }

    @Override
    public void addOnNewIntentListener(
        @NonNull io.flutter.plugin.common.PluginRegistry.NewIntentListener listener) {
      onNewIntentListeners.add(listener);
    }

    @Override
    public void removeOnNewIntentListener(
        @NonNull io.flutter.plugin.common.PluginRegistry.NewIntentListener listener) {
      onNewIntentListeners.remove(listener);
    }

    /**
     * Invoked by the {@link FlutterEngine} that owns this {@code ActivityPluginBinding} when its
     * associated {@link Activity} has its {@code onNewIntent(...)} method invoked.
     */
    void onNewIntent(@Nullable Intent intent) {
      for (io.flutter.plugin.common.PluginRegistry.NewIntentListener listener :
          onNewIntentListeners) {
        listener.onNewIntent(intent);
      }
    }

    @Override
    public void addOnUserLeaveHintListener(
        @NonNull io.flutter.plugin.common.PluginRegistry.UserLeaveHintListener listener) {
      onUserLeaveHintListeners.add(listener);
    }

    @Override
    public void removeOnUserLeaveHintListener(
        @NonNull io.flutter.plugin.common.PluginRegistry.UserLeaveHintListener listener) {
      onUserLeaveHintListeners.remove(listener);
    }

    @Override
    public void addOnSaveStateListener(@NonNull OnSaveInstanceStateListener listener) {
      onSaveInstanceStateListeners.add(listener);
    }

    @Override
    public void removeOnSaveStateListener(@NonNull OnSaveInstanceStateListener listener) {
      onSaveInstanceStateListeners.remove(listener);
    }

    /**
     * Invoked by the {@link FlutterEngine} that owns this {@code ActivityPluginBinding} when its
     * associated {@link Activity} has its {@code onUserLeaveHint()} method invoked.
     */
    void onUserLeaveHint() {
      for (io.flutter.plugin.common.PluginRegistry.UserLeaveHintListener listener :
          onUserLeaveHintListeners) {
        listener.onUserLeaveHint();
      }
    }

    /**
     * Invoked by the {@link FlutterEngine} that owns this {@code ActivityPluginBinding} when its
     * associated {@link Activity} or {@code Fragment} has its {@code onSaveInstanceState(Bundle)}
     * method invoked.
     */
    void onSaveInstanceState(@NonNull Bundle bundle) {
      for (OnSaveInstanceStateListener listener : onSaveInstanceStateListeners) {
        listener.onSaveInstanceState(bundle);
      }
    }

    /**
     * Invoked by the {@link FlutterEngine} that owns this {@code ActivityPluginBinding} when its
     * associated {@link Activity} has its {@code onCreate(Bundle)} method invoked, or its
     * associated {@code Fragment} has its {@code onActivityCreated(Bundle)} method invoked.
     */
    void onRestoreInstanceState(@Nullable Bundle bundle) {
      for (OnSaveInstanceStateListener listener : onSaveInstanceStateListeners) {
        listener.onRestoreInstanceState(bundle);
      }
    }
  }

  private static class FlutterEngineServicePluginBinding implements ServicePluginBinding {
    @NonNull private final Service service;
    @Nullable private final HiddenLifecycleReference hiddenLifecycleReference;

    @NonNull
    private final Set<ServiceAware.OnModeChangeListener> onModeChangeListeners = new HashSet<>();

    FlutterEngineServicePluginBinding(@NonNull Service service, @Nullable Lifecycle lifecycle) {
      this.service = service;
      hiddenLifecycleReference = lifecycle != null ? new HiddenLifecycleReference(lifecycle) : null;
    }

    @Override
    @NonNull
    public Service getService() {
      return service;
    }

    @Nullable
    @Override
    public Object getLifecycle() {
      return hiddenLifecycleReference;
    }

    @Override
    public void addOnModeChangeListener(@NonNull ServiceAware.OnModeChangeListener listener) {
      onModeChangeListeners.add(listener);
    }

    @Override
    public void removeOnModeChangeListener(@NonNull ServiceAware.OnModeChangeListener listener) {
      onModeChangeListeners.remove(listener);
    }

    void onMoveToForeground() {
      for (ServiceAware.OnModeChangeListener listener : onModeChangeListeners) {
        listener.onMoveToForeground();
      }
    }

    void onMoveToBackground() {
      for (ServiceAware.OnModeChangeListener listener : onModeChangeListeners) {
        listener.onMoveToBackground();
      }
    }
  }

  private static class FlutterEngineBroadcastReceiverPluginBinding
      implements BroadcastReceiverPluginBinding {
    @NonNull private final BroadcastReceiver broadcastReceiver;

    FlutterEngineBroadcastReceiverPluginBinding(@NonNull BroadcastReceiver broadcastReceiver) {
      this.broadcastReceiver = broadcastReceiver;
    }

    @NonNull
    @Override
    public BroadcastReceiver getBroadcastReceiver() {
      return broadcastReceiver;
    }
  }

  private static class FlutterEngineContentProviderPluginBinding
      implements ContentProviderPluginBinding {
    @NonNull private final ContentProvider contentProvider;

    FlutterEngineContentProviderPluginBinding(@NonNull ContentProvider contentProvider) {
      this.contentProvider = contentProvider;
    }

    @NonNull
    @Override
    public ContentProvider getContentProvider() {
      return contentProvider;
    }
  }
}