Android ScrollView实现横向和竖向拖动回弹效果

public class ReboundScrollView extends ScrollView{  private static final int MAX_SCROLL = 200;  private static final float SCROLL_RATIO = 0.5f;// 阻尼系数    public ReboundScrollView(Context context)  {   super(context);  }   public ReboundScrollView(Context context, AttributeSet attrs)  {   super(context, attrs);  }   public ReboundScrollView(Context context, AttributeSet attrs, int defStyle)  {   super(context, attrs, defStyle);  }    @Override  protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent)  {    int newDeltaY = deltaY;   int delta = (int) (deltaY * SCROLL_RATIO);   if((scrollY+deltaY)==0 || (scrollY-scrollRangeY+deltaY)==0){    newDeltaY = deltaY;  //回弹最后一次滚动，复位   }else{    newDeltaY = delta;  //增加阻尼效果   }   return super.overScrollBy(deltaX, newDeltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX, MAX_SCROLL, isTouchEvent);   } } 

public class ReboundHScrollView extends HorizontalScrollView{  private static final int MAX_SCROLL = 200;  private static final float SCROLL_RATIO = 0.5f;// 阻尼系数    public ReboundHScrollView(Context context)  {   super(context);  }   public ReboundHScrollView(Context context, AttributeSet attrs)  {   super(context, attrs);  }   public ReboundHScrollView(Context context, AttributeSet attrs, int defStyle)  {   super(context, attrs, defStyle);  }    @Override  protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent)  {    int newDeltaX = deltaX;   int delta = (int) (deltaX * SCROLL_RATIO);   if((scrollX+deltaX)==0 || (scrollX-scrollRangeX+deltaX)==0){    newDeltaX = deltaX;  //回弹最后一次滚动，复位   }else{    newDeltaX = delta;  //增加阻尼效果   }   return super.overScrollBy(newDeltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, MAX_SCROLL, maxOverScrollY, isTouchEvent);   } }