listView 的回弹overScrollBy_android listview上下滚动回弹overscrollby-优快云博客

本文链接：https://blog.youkuaiyun.com/baimuda_android/article/details/50504082

本文介绍如何通过重写ListView的overScrollBy()方法来实现带有弹性效果的ListView。通过设置自定义的最大偏移距离mMaxOverDistance，可以控制ListView在达到边界时的滑动行为。

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ListView有一个控制滑动到边缘的处理方法

代码：

@Override
	protected boolean overScrollBy(int deltaX,int deltaY,int scrollX, int scrollY, int scrollRangeX,int scrollRangeY, int maxOverScrollX,
			int maxOverScrollY, boolean isTouchEvent){ 
		//maxOverScrollY---Number of pixels to overscroll by in either direction along the Y axis 即：默认值为0
		return super.overScrollBy(deltaX, deltaY, scrollX, scrollY,scrollRangeX, scrollRangeY, maxOverScrollX,maxOverScrollY,isTouchEvent);  
	}

重写ListView的overScrollBy（）实现具有弹性的ListView，

代码如下：

<pre name="code" class="java">public class MyListView extends ListView{
	private Context context;

	public MyListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		// TODO Auto-generated constructor stub
		this.context = context;
	}

	public MyListView(Context context, AttributeSet attrs) {
		this(context,attrs,0);
		// TODO Auto-generated constructor stub
	}

	public MyListView(Context context) {
		this(context,null);
		// TODO Auto-generated constructor stub
	}
	private   int mMaxOverDistance = 120;
	@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, mMaxOverDistance, isTouchEvent);  
	}
	


}