Android服務未收到來自活動的消息

Question

我已經創建了需要能夠相互通信的服務和活動。活動應向服務發送消息，服務應回覆結果。

問題是，該消息似乎沒有使其服務。這是從代碼輸出到日誌：

02-07 18:26:37.057: I/Task Timer(8850): Service bound 
02-07 18:26:37.097: V/Task Timer(8850): Service connected: ComponentInfo{com.gawdl3y.android.tasktimer/com.gawdl3y.android.tasktimer.TaskService} 
02-07 18:26:37.097: I/Task Timer(8850): Activity sent message: { what=1 when=-1d11h33m57s160ms } 
02-07 18:26:37.167: I/ActivityManager(482): Displayed com.gawdl3y.android.tasktimer/.TaskListActivity: +166ms 

沒有其他應用程序被記錄。 這裏是我的相關代碼：

TaskService.java

public class TaskService extends Service { 
    public static String TAG = null; 

    private final IBinder binder = new ServiceBinder(); 
    private Messenger messenger = new Messenger(new IncomingHandler()), activityMessenger; 

    @Override 
    public void onCreate() { 
     Log.i(getString(R.string.app_name), "Service started"); 
     TAG = getString(R.string.service_label); 
    } 

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

    @Override 
    public void onDestroy() { 
     Log.i(TAG, "Service destroyed"); 
    } 

    public class ServiceBinder extends Binder { 
     TaskService getService() { 
      return TaskService.this; 
     } 
    } 

    private final class IncomingHandler extends Handler { 
     @Override 
     public void handleMessage(Message msg) { 
      activityMessenger = msg.replyTo; 
      Log.i(TAG, "Service received message: " + msg); 

      switch(msg.what) { 
      case TaskListActivity.MSG_GET_TASKS: 
       // Create the response message and send it 
       Message response = Message.obtain(null, 1, tasks); 
       try { 
        activityMessenger.send(response); 
        Log.i(TAG, "Service sent message: " + response); 
       } catch(android.os.RemoteException e) { 
        Log.i(TAG, "Service failed to send message: " + response + " (" + e.getLocalizedMessage() + " caused by " + e.getCause() + ")"); 
       } 

       // Return the message to the global pool 
       response.recycle(); 

       break; 
      default: 
       super.handleMessage(msg); 
      } 
     } 
    } 
} 

TaskListActivity.java

public class TaskListActivity extends SherlockActivity { 

    public static final int MSG_GET_TASKS = 1; 

    private TaskService service; 
    private Messenger messenger = new Messenger(new IncomingHandler()), serviceMessenger; 
    private boolean connected = false; 

    private ServiceConnection serviceConnection = new ServiceConnection() { 
     public void onServiceConnected(ComponentName name, IBinder service) { 
      Log.v(TAG, "Service connected: " + name); 

      // Set the service messenger and connected status 
      TaskListActivity.this.serviceMessenger = new Messenger(service); 
      TaskListActivity.this.connected = true; 

      // Create a new message to send to retrieve the tasks 
      Message msg = Message.obtain(null, MSG_GET_TASKS); 
      msg.replyTo = messenger; 

      // Send the message 
      try { 
       serviceMessenger.send(msg); 
       Log.i(TAG, "Activity sent message: " + msg); 
      } catch(android.os.RemoteException e) { 
       Log.i(TAG, "Activity failed to send message: " + msg + " (" + e.getLocalizedMessage() + " caused by " + e.getCause() + ")"); 
      } 

      // Return the message to the global pool 
      msg.recycle(); 
     } 

     public void onServiceDisconnected(ComponentName name) { 
      Log.v(TAG, "Service disconnected: " + name); 

      // Reset the service messenger and connection status 
      TaskListActivity.this.serviceMessenger = null; 
      TaskListActivity.this.connected = false; 
     } 
    }; 

    @Override 
    protected void onStart() { 
     super.onStart(); 

     // Show the loading indicator 
     //setSupportProgressBarIndeterminateVisibility(true); 

     // Start and bind the service 
     Intent intent = new Intent(this, TaskService.class); 
     startService(intent); 
     if(bindService(intent, serviceConnection, Context.BIND_ABOVE_CLIENT | Context.BIND_ADJUST_WITH_ACTIVITY)) { 
      Log.i(TAG, "Service bound"); 
     } else { 
      Log.i(TAG, "Service not bound"); 
      Toast.makeText(this, "Task Service couldn't be bound", Toast.LENGTH_SHORT).show(); 
      finish(); 
     } 
    } 

    @Override 
    protected void onStop() { 
     super.onStop(); 

     // Unbind service 
     unbindService(serviceConnection); 
     Log.i(TAG, "Service unbound"); 
    } 

    private final class IncomingHandler extends Handler { 
     @Override 
     public void handleMessage(Message msg) { 
      switch(msg.what) { 
      case MSG_GET_TASKS: 
       Log.i(TAG, "Activity received message: " + msg); 
       onTasksLoaded((ArrayList<Task>) msg.obj); 
       break; 
      default: 
       super.handleMessage(msg); 
      } 
     } 
    } 
} 

Answer 1

在你的onBind方法，你可以嘗試返回代替粘合劑的messenger.getBinder（）？