This is a todo cardview ItemAnimator for enter and exit.
这是一个recyclerView的Item进入以及退出的动画项目，我参照DefaultItemAnimator类，并加入了一些其他的动画效果。具体情况请看代码，其实并不复杂。
我是从dribbble中获得的灵感dribbble
欢迎完善。
看起来可能是这个样子
代码里直接将DefaultAnimator复制过来，然后添加了add、remove的动画实现，直接继承DefaultAnimator不是看起来简洁许多吗？
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