content: /*
   * Copyright (C) 2006 The Android Open Source Project
   *
   * Licensed 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 android.content;
  
  import android.os.IBinder;
  
  /**
   * Interface for monitoring the state of an application service.  See
   * {@link android.app.Service} and
   * {@link Context#bindService Context.bindService()} for more information.
   * <p>Like many callbacks from the system, the methods on this class are called
   * from the main thread of your process.
   */
  public interface ServiceConnection {
      /**
       * Called when a connection to the Service has been established, with
       * the {@link android.os.IBinder} of the communication channel to the
       * Service.
       *
       * <p class="note"><b>Note:</b> If the system has started to bind your
       * client app to a service, it's possible that your app will never receive
       * this callback. Your app won't receive a callback if there's an issue with
       * the service, such as the service crashing while being created.
       *
       * @param name The concrete component name of the service that has
       * been connected.
       *
       * @param service The IBinder of the Service's communication channel,
       * which you can now make calls on.
       */
      void onServiceConnected(ComponentName name, IBinder service);
  
      /**
       * Called when a connection to the Service has been lost.  This typically
       * happens when the process hosting the service has crashed or been killed.
       * This does <em>not</em> remove the ServiceConnection itself -- this
       * binding to the service will remain active, and you will receive a call
       * to {@link #onServiceConnected} when the Service is next running.
       *
       * @param name The concrete component name of the service whose
       * connection has been lost.
       */
      void onServiceDisconnected(ComponentName name);
  
      /**
       * Called when the binding to this connection is dead.  This means the
       * interface will never receive another connection.  The application will
       * need to unbind and rebind the connection to activate it again.  This may
       * happen, for example, if the application hosting the service it is bound to
       * has been updated.
       *
       * @param name The concrete component name of the service whose
       * connection is dead.
       */
      default void onBindingDied(ComponentName name) {
      }
  
      /**
       * Called when the service being bound has returned {@code null} from its
       * {@link android.app.Service#onBind(Intent) onBind()} method.  This indicates
       * that the attempting service binding represented by this ServiceConnection
       * will never become usable.
       *
       * <p class="note">The app which requested the binding must still call
       * {@link Context#unbindService(ServiceConnection)} to release the tracking
       * resources associated with this ServiceConnection even if this callback was
       * invoked following {@link Context#bindService Context.bindService() bindService()}.
       *
       * @param name The concrete component name of the service whose binding
       *     has been rejected by the Service implementation.
       */
      default void onNullBinding(ComponentName name) {
      }
  }
  