Android 兩個Service的相互監視實現代碼

兩個Service之間相互監視的實現

在實際開發中可能需要用到兩個Service相互監視的情況，本示例就是實現此功能以作參考。

服務A：

public class ServiceA extends Service {


  private static final String TAG = ServiceA.class.getSimpleName();
  MyBinder mBinder;
  MyServiceConnection mServiceConnection;
  PendingIntent mPendingIntent;

  @Override
  public void onCreate() {
    super.onCreate();

    if(mBinder==null)
    {
      mBinder=new MyBinder();
    }
    mServiceConnection=new MyServiceConnection();
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);
    mPendingIntent=PendingIntent.getService(this,0,intent,0);
    Notification.Builder builder=new Notification.Builder(this);
    builder.setTicker("守護服務A啟動中")
        .setContentText("我是來守護服務B的")
        .setContentTitle("守護服務A")
        .setSmallIcon(R.mipmap.ic_launcher)
        .setContentIntent(mPendingIntent)
        .setWhen(System.currentTimeMillis());
    Notification notification=builder.build();

    startForeground(startId,notification);


    return START_STICKY;
  }

  @Override
  public IBinder onBind(Intent intent) {
    return mBinder;
  }

  public class MyBinder extends IBridgeInterface.Stub {

    @Override
    public String getName() throws RemoteException {
      return "name:"+TAG;
    }
  }

  class MyServiceConnection implements ServiceConnection {

    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
      String name=null;
      try {
        name= IBridgeInterface.Stub.asInterface(iBinder).getName();
      } catch (RemoteException e) {
        e.printStackTrace();
      }


      Toast.makeText(ServiceA.this,name+"連接成功",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
      Toast.makeText(ServiceA.this,TAG+"斷開連接",Toast.LENGTH_SHORT).show();

      ServiceA.this.startService(new Intent(ServiceA.this,ServiceB.class));

      ServiceA.this.bindService(new Intent(ServiceA.this,ServiceB.class),mServiceConnection, Context.BIND_IMPORTANT);

    }
  }


}

服務B：

public class ServiceB extends Service {

  private static final String TAG = ServiceB.class.getSimpleName();
  private PendingIntent mPendingIntent;
  private MyBinder mBinder;
  private MyServiceConnection mServiceConnection;

  @Override
  public IBinder onBind(Intent intent) {
    return mBinder;
  }

  @Override
  public void onCreate() {
    super.onCreate();
    if (mBinder == null) {
      mBinder = new MyBinder();
    }

    mServiceConnection = new MyServiceConnection();
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);
    mPendingIntent = PendingIntent.getService(this, 0, intent, 0);
    Notification.Builder builder = new Notification.Builder(this);

    builder.setTicker("守護服務B啟動中")
        .setContentText("我是來守護服務A的")
        .setContentTitle("守護服務B")
        .setSmallIcon(R.mipmap.ic_launcher)
        .setContentIntent(mPendingIntent)
        .setWhen(System.currentTimeMillis());
    Notification notification = builder.build();
    startForeground(startId, notification);

    return START_STICKY;
  }

  public class MyBinder extends IBridgeInterface.Stub {

    @Override
    public String getName() throws RemoteException {
      return "name:"+TAG;
    }
  }

  class MyServiceConnection implements ServiceConnection {

    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
      String name=null;
      try {
        name=IBridgeInterface.Stub.asInterface(iBinder).getName();
      } catch (RemoteException e) {
        e.printStackTrace();
      }
      Toast.makeText(ServiceB.this, name + "連接成功", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
      Toast.makeText(ServiceB.this, TAG + "斷開連接", Toast.LENGTH_SHORT).show();

      ServiceB.this.startService(new Intent(ServiceB.this, ServiceA.class));
      ServiceB.this.bindService(new Intent(ServiceB.this, ServiceA.class), mServiceConnection, Context.BIND_IMPORTANT);
    }
  }


}

IBridgeInterface.aidl

1 interface IBridgeInterface {
2   String getName();
3 }

界面：

public class MainActivity extends Activity {


  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    startService(new Intent(this, ServiceA.class));
    startService(new Intent(this, ServiceB.class));
  }

}

AndroidManifest.xml

<service android:name=".services.ServiceA" />
    <service
      android:name=".services.ServiceB"
       android:process=":remote" />

由於涉及到跨進程，onServiceConnected() 方法中使用

IBridgeInterface.Stub.asInterface(iBinder).getName();
而不能直接類型轉換

((ServiceA.MyBinder)iBinder).getName(); 

onStartCommand

onStartCommand() 方法必須返回整型數。整型數是一個值，用於描述系統應該如何在服務終止的情況下繼續運行服務。

返回的值必須是以下常量之一：

START_NOT_STICKY

　　如果系統在 onStartCommand() 返回後終止服務，則除非有掛起 Intent 要傳遞，否則系統不會重建服務。

START_STICKY

　　如果系統在 onStartCommand() 返回後終止服務，則會重建服務並調用 onStartCommand()，但絕對不會重新傳遞最後一個 Intent。相反，除非有掛起 Intent 要啟動服務（在這種情況下，將傳遞這些 Intent ），否則系統會通過空 Intent 調用 onStartCommand()。這適用於不執行命令、但無限期運行並等待作業的媒體播放器（或類似服務）。

START_REDELIVER_INTENT

　　如果系統在 onStartCommand() 返回後終止服務，則會重建服務，並通過傳遞給服務的最後一個 Intent 調用 onStartCommand()。任何掛起 Intent 均依次傳遞。這適用於主動執行應該立即恢復的作業（例如下載文件）的服務。

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