[Android] Gestures:pointer event - moving,flinging

1. Docs
   
   • http://developer.android.com/reference/android/gesture/package-summary.html
   • http://developer.android.com/resources/articles/gestures.html
     
2. Sample
   
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   • http://android-journey.blogspot.com/2010/01/android-gestures.html
     
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3. Summary
   A gesture is a hand-drawn shape on a touch screen. It can have one or multiple strokes. Each stroke is a sequence of timed points. A user-defined gesture can be recognized by a GestureLibrary and a built-in alphabet gesture can be recognized by a LetterRecognizer.  (Sample app: mysign)
   
   With Android package android.gesture, you can store, load, draw, and recognize gestures.
   
4. Classes
   
   • GestureLibrary
     
   • GestureOverlayView
   • Prediction
   • GestureDetector
   • OnGestureListener
     
5. xx