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);     } }