嵌套滑动问题

因为项目需要，处理嵌套滑动问题，我首先参考了这个https://www.jianshu.com/p/c5ccf0c38186
首先使用方案三，发现没有效果，于是改用方案一，然后发现在普通列表项滑动正常，但是如果父级recycleview设置了headview，则在其headview中滑动没有任何效果，所以我猜想是headview惹的祸（footview没有测试），于是又参考了https://blog.csdn.net/qq_28844947/article/details/107069106

最终解决方案如下：
继承RecyclerView，重写onInterceptTouchEvent方法如下：

public boolean onInterceptTouchEvent(MotionEvent e) {
		Adapter adapter = getAdapter();
		View headView=null;
		if(adapter instanceof BaseQuickAdapter){
			BaseQuickAdapter baseQuickAdapter= (BaseQuickAdapter) adapter;
			if(baseQuickAdapter.hasHeaderLayout()){
				headView=baseQuickAdapter.getHeaderLayout();
			}
		}else if(adapter instanceof DelegateMultiAdapter){
			DelegateMultiAdapter delegateMultiAdapter= (DelegateMultiAdapter) adapter;
			headView=delegateMultiAdapter.getHeaderLayout();
		}
		View view = findChildViewUnder(e.getX(), e.getY());
		if(view.equals(headView)){
			return super.onInterceptTouchEvent(e);
		}else{
			return false;
		}
}

Start at RecyclerView.onInterceptTouchEvent and inspect how BaseQuickAdapter and DelegateMultiAdapter expose header layouts. Reproduce nested scrolling with a parent RecyclerView header, then verify that scrolling works both inside the header and in ordinary list items.