title: Make onSensorChanged not to slow UI
body: <p>My app acquires data from accelerometer and the UI is not so responsive as it should be.
  I suppose this is because SensorEventListener is called in the UI thread. 
  So I tried to create a new thread, with an inner class which implements the event listener and in the thread I registered the accelerometer.
  Nevertheless the code was executed in the UI thread. So: how would you make onSensorChanged not slowing UI?</p>