回弹效果listview

public class ReboundListview extends ListView  {      private static final int MAX_Y_OVERSCROLL_DISTANCE = 200;      private Context mContext;      private int mMaxYOverscrollDistance;      public BounceListView(Context context)       {          super(context);          mContext = context;          initBounceListView();      }      public BounceListView(Context context, AttributeSet attrs)       {          super(context, attrs);          mContext = context;          initBounceListView();      }      public BounceListView(Context context, AttributeSet attrs, int defStyle)       {          super(context, attrs, defStyle);          mContext = context;          initBounceListView();      }      private void initBounceListView()      {          //get the density of the screen and do some maths with it on the max overscroll distance          //variable so that you get similar behaviors no matter what the screen size          final DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();              final float density = metrics.density;          mMaxYOverscrollDistance = (int) (density * MAX_Y_OVERSCROLL_DISTANCE);      }      @Override      protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent)       {           //This is where the magic happens, we have replaced the incoming maxOverScrollY with our own custom variable mMaxYOverscrollDistance;           return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX, mMaxYOverscrollDistance, isTouchEvent);        }  }
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