Android ScrollView achieves horizontal and vertical drag rebound effects

public class ReboundScrollView extends ScrollView{ 
 private static final int MAX_SCROLL = 200; 
 private static final float SCROLL_RATIO = 0.5f;// Damping coefficient  
 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;  //Rounce back for the last scroll, reset  }else{ 
   newDeltaY = delta;  //Increase the damping effect  } 
  return (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;// Damping coefficient  
 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;  //Rounce back for the last scroll, reset  }else{ 
   newDeltaX = delta;  //Increase the damping effect  } 
  return (newDeltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, MAX_SCROLL, maxOverScrollY, isTouchEvent);  
 } 
}