Using RecyclerView to simulate the view of tree structure.
- Using only one RecyclerView.
- The layout of the parent item and child item is different.
- The depth of the tree is positively related to marginLeft.
- The animation of 'expand' or 'hide' is done by adding or removing the children nodes.
@Author: Zheng Haibo @Website: www.mobctrl.net
Copyright 2014 Zheng Haibo
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