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TreeTest
- android 实现树形结构的列表，可以添加二级、三级或更多级的节点-android tree structure to achieve a list, you can add two, three or more levels of nodes
ExpandableListViewDemo
- 超使用简单的二级树形下拉及三级树形下拉，初学者学习的好代码-Super simple two and three tree tree drop down , beginners learn the code