带有悬浮条的RecyclerView + 自定义CircleImageView + 自定义Behavior
用CoordinateLayout + RecyclerView实现的带有悬浮条效果的demo, 并且用到了自定义CircleImageView
帧布局包裹RecyclerView和RecyclerView的Title布局（悬浮条），滚动时监听下一个Item的title布局到顶部的位置， 从而设置悬浮条的向上滚动和悬浮静止以及其数据的更新。
实现FloatingActionBar的上滑缩放隐藏和下拉缩放显示以及点击回到顶部功能
tips:
Behavior是Android Support Design库里面新增的布局概念，主要的作用是用来协调CoordinatorLayout
里面直接Child Views之间交互行为的.特别要注意的点是Behavior只能作用于CoordinatorLayout的直接Child View.
参考：Android CoordinatorLayout Behavior
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