Question

我为应用程序编写了一个代码，当手机以某个角度倾斜时会发出蜂鸣声。它在开始时工作正常，但是当我向第7或第8次倾斜电话时，它不再发出哔哔声。当我检查应用程序状态时，它显示为正在运行。我的服务代码是

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;
    }

}

我的主要活动代码是

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));

    }
        }

我不确定android是否正在杀死它或我的代码中有任何问题。如果Android正在这样做，该应用程序将不会显示为在后台运行。请帮助。

Answer 1

你有任何日志吗？

避免重新创建MediaPlayer：

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

几声哔哔声后，应用程序意外停止

1 个答案: