Android 手指滑動事件 (fling event)

      GestureDetector gestureDetector = new GestureDetector (new MyGestureDetector());  

       
      // *** 觸控事件 ******************
      @Override  
      public boolean onTouchEvent(MotionEvent event) {  
           if (gestureDetector.onTouchEvent(event)) {  
                return true;  
          }  
           return true;  
      }  


      // *** 事件 fling event********      
      private class MyGestureDetector extends SimpleOnGestureListener {  
           private static final int SWIPE_MIN_DISTANCE = 50;  
             private static final int SWIPE_MAX_OFF_PATH = 250;  
             private static final int SWIPE_THRESHOLD_VELOCITY = 200;  
           @Override  
           public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,     float velocityY) {  
                try {  
                    if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)  
                         return false;  
                    if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {  
                    } // left to right swipe   
                    else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {  
                    }  
                } catch (Exception e) {  
                    // nothing  
                }  
                return false;  
           }  
      }