项目gif展示：
- 外部RecyclerView为ParentRecyclerView，将需要吸顶的悬浮效果的TabLayout和ViewPager作为ParentRecyclerView的一个item。
- 内部RecyclerView为ChildRecyclerView,ParentRecyclerView和ChildRecyclerView相互协调:
- 当ParentRecyclerView滚动到底部的时候，让ChildRecyclerView去滚动
- 当ChildRecyclerView滚动到顶部的时候，让ParentRecyclerView去滚动
- fling效果与滑动类似
- 具体实现可看项目代码
博客：https://blog.csdn.net/H_Gao
Copyright 2018 JasonGaoH
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