In this example you will see how to create, register & unregister a SensorListener, in this example we focus on Gyroscope Sensor.

Android Sensor Listener Example.java

/**
     * Create a GYROSCOPE SENSOR Listener
     * Check for more info: http://developer.android.com/guide/topics/sensors/sensors_motion.html
     */
 
    private SensorManager mSensorService;
    private Sensor mSensor;
    private SensorEventListener mySensorEventListener;
 
    mySensorEventListener = new SensorEventListener() {
        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
        }
        @Override
        public void onSensorChanged(SensorEvent event) {
            Log.v("SENSOR",event.values[0]+" "+event.values[1]+" "+event.values[2]);
        }
    };
 
    mSensorService = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mSensor = mSensorService.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
    if (mSensor != null) {
        mSensorService.registerListener(mySensorEventListener, mSensor,
                SensorManager.SENSOR_DELAY_NORMAL);
        Log.i("Compass MainActivity", "Registerered for GYROSCOPE Sensor");
    } else {
        Log.e("Compass MainActivity", "Registerered for GYROSCOPE Sensor");
        Toast.makeText(this, "ORIENTATION Sensor not found",
                Toast.LENGTH_LONG).show();
 
        /**
         * Call finish(); only if you want to close your activity right away...
         */
        //finish();
    }
 
    /**
     * IMPORANT!!!!
     * Unregister Listener onDestroy(), onPause() or any other place...don't forget it, we need the resources man!
     */
    if (mSensor != null) {
        mSensorService.unregisterListener(mySensorEventListener);
    }