title: Get speed of a onTouch ACTION_MOVE event in Android
body: <p>This should be a pretty simple thing to do. The user puts his finger on the screen and drags it around the screen. There are two events firing on onTouch:</p>
  
  <ul>
  <li>MotionEvent.ACTION_DOWN</li>
  <li>MotionEvent.ACTION_MOVE</li>
  </ul>
  
  <p>Now, how can I calculate the speed of the ACTION_MOVE gesture ? The user drags the finger slower or faster during a gesture, so I think I need to calculate the speed between two intermediate touched points: the lastTouchedPointX,lastTouchedPointY and the event.getX(),event.getY().</p>
  
  <p>Has anyone done this before ?</p>