@Override
  protected void onResume() {
    Log.d("ARComponentBase", "onResume()");
    super.onResume();

    arView.onResume();
    sceneView.onResume();
    sensorManager.resume();

    /*/ // no use
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {

    	@Override
    	public void run() {
    		sceneView.bringToFront();
    		if(compassView != null) compassView.bringToFront();
    	}

    }, 2500);
    /**/
  }
 @Override
 protected void onResume() {
   super.onResume();
   sensorManager.resume();
 }