How to get sensor data in service when screen is turned off?

I am trying to create an application that tracks the orientation of the device for a certain amount of time using a service. when the orientation changes, the device makes a sound. This is working perfectly as long as the device is on. As soon as i lock the device or the screen turns off, i dont hear the sounds (which i want to).

My service code is

public class RakatTrackingService extends Service implements SensorEventListener {
private SharedPreferences sharedPref;
private long[] sessionComposition = new long[4];
private String position="none", lastPosition ="none";
private SensorManager sensorManager;
private Sensor accelerometer;
private PowerManager.WakeLock wakeLock;

public RakatTrackingService()
{

}
public RakatTrackingService(long[] sessionComposition) {
    this.sessionComposition = sessionComposition;


}

@Override
public void onCreate() {
    super.onCreate();
    SharedPreferences sharedPref = getSharedPreferences("rakatData",Context.MODE_PRIVATE);

    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    if (sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) != null)
    {
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
        Toast.makeText(this, "sensor registered", Toast.LENGTH_LONG).show();
    }
}

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

@Override
public void onSensorChanged(SensorEvent event) {

    lastPosition = position;
    if(Math.abs(event.values[0]) > Math.abs(event.values[1]) && Math.abs(event.values[0]) > Math.abs(event.values[2]))
    {
        position="horizontal-side";
    }
    if(Math.abs(event.values[1]) > Math.abs(event.values[0]) && Math.abs(event.values[1]) > Math.abs(event.values[2]))
    {
        position="vertical";
    }
    if(Math.abs(event.values[2]) > Math.abs(event.values[0]) && Math.abs(event.values[2]) > Math.abs(event.values[1]))
    {
        position="horizontal";
    }


    System.out.println(position);

    if(!lastPosition.equalsIgnoreCase(position))
    {
        MediaPlayer mp = MediaPlayer.create(this, R.raw.click);
        mp.start();
        mp.setLooping(false);
    }
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    PowerManager mgr = (PowerManager)getApplicationContext().getSystemService(Context.POWER_SERVICE);
    wakeLock = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyWakeLock");
    wakeLock.acquire();
    return START_STICKY;

}

@Override
public void onDestroy() {
    super.onDestroy();
    wakeLock.release();
}
}

Please help me resolve this issue.

Simply you can't. Sensor listeners doesn't work then your screen is off. You need the app to be active for using it. You can try to acquire a PARTIAL_WAKE_LOCK or a SCREEN_DIM_WAKE_LOCK