myservice class

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


        if(intent.getAction().equals("start"))
        {
            sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
            sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
            sensorManager.registerListener(this, sensor,
                    SensorManager.SENSOR_DELAY_FASTEST);
        }
        else if(intent.getAction().equals("stop"))
        {
            stopSelf();
        }

        return START_STICKY;
     }