幾聲蜂鳴聲後應用程序意外停止

Question

我寫了一個應用程序的代碼，當手機以某個角度傾斜時，該應用程序會發出嗶聲。它在開始時工作正常，但當我第7次或第8次向後傾斜手機時，它會停止發出嗶嗶聲。當我檢查應用程序狀態時，它顯示爲正在運行。我對服務代碼

public class TheService extends Service implements SensorEventListener { 
    public static final String TAG = TheService.class.getName(); 
    public static final int SCREEN_OFF_RECEIVER_DELAY = 500; 

    private SensorManager mSensorManager = null; 
    private WakeLock mWakeLock = null; 
    private float lastY; 

    MediaPlayer mp1; 
    private MediaPlayer mMediaPlayer; 


    /* 
    * Register this as a sensor event listener. 
    */ 
    private void registerListener() { 
     mSensorManager.registerListener(this, 
       mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
       SensorManager.SENSOR_DELAY_NORMAL); 
    } 

    /* 
    * Un-register this as a sensor event listener. 
    */ 
    private void unregisterListener() { 
     mSensorManager.unregisterListener(this); 
    } 

    public BroadcastReceiver mReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      Log.i(TAG, "onReceive("+intent+")"); 

      if (!intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) { 
       return; 
      } 

      Runnable runnable = new Runnable() { 
       public void run() { 
        Log.i(TAG, "Runnable executing."); 
        unregisterListener(); 
        registerListener(); 
       } 
      }; 

      new Handler().postDelayed(runnable, SCREEN_OFF_RECEIVER_DELAY); 
     } 
    }; 

    public void onAccuracyChanged(Sensor sensor, int accuracy) { 


     Log.i(TAG, "onAccuracyChanged()."); 


    } 

    public void onSensorChanged(SensorEvent event) { 
     Log.i(TAG, "onSensorChanged()."); 

     lastY = event.values[2]; 

     if (lastY <9 && lastY > 8) { 
     mMediaPlayer = MediaPlayer.create(this, R.raw.help); 


     mMediaPlayer.start(); 


     }  


     } 


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

     mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 

     PowerManager manager = 
      (PowerManager) getSystemService(Context.POWER_SERVICE); 
     mWakeLock = manager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); 

     registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_SCREEN_OFF)); 
    } 

    @Override 
    public void onDestroy() { 

    mMediaPlayer.release(); 
     unregisterReceiver(mReceiver); 
     unregisterListener(); 
     mWakeLock.release(); 
     stopForeground(true); 


    } 

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

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
     super.onStartCommand(intent, flags, startId); 

     startForeground(Process.myPid(), new Notification()); 
     registerListener(); 
     mWakeLock.acquire(); 

     return START_STICKY; 
    } 

} 

我的主要活動代碼

public class MainActivity extends Activity { 
    public static final String TAG = HelpIMFalling.class.getName(); 


    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

    } 

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

     startService(new Intent(this, TheService.class)); 

    } 
     } 

我不知道，如果Android是殺死它還是有我的代碼中任何問題。如果Android已經這樣做了，該應用程序將不會顯示爲在後臺運行。請幫助。

Answer 1

你有沒有日誌？

避免重新創建的MediaPlayer：

if(mMediaPlayer == null) 
    mMediaPlayer = MediaPlayer.create(this, R.raw.help);