Unregistering SensorManager doesn't work

Question

In my app, I am using the light and proximity sensor to detect phone out of pocket functionality and then unregistering the SensorManager when their detection is complete. B

Answer 1

Just put this register code into main handler, then it works. but I don't know why.

Handler mainHandler = new Handler(Looper.getMainLooper());
    mainHandler.post(new Runnable() {
        @Override
        public void run() {
            if (mSensorManager != null) {
                mSensorManager.registerListener(sensorEventListener, mProximity, SensorManager.SENSOR_DELAY_NORMAL);
            }
        }
    });