通讯录实现,附带滚动侧栏、浮动标题头。可复用为其他需要实现滑动标题头的列表控件。解析blog请见:http://www.hgworts.tech/android/2017/01/04/Android优雅实现通讯录FloatingBarItemDecorationKey class which takes care of section bar of the list(RecyclerView)onDraw()handles the drawing of the section baronDrawOver()handles the drawing of the floating section
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