#MultiLevelListView

这是一个可以无限分层的listview，支持下拉刷新，上拉加载，后续可能会加上动画和删除功能，欢迎大家使用以及提出建议。 在此引入了XlistView工程的一些功能(感谢Xlistview的作者)。

This is a MultiLevelListView，support pull to refresh and pull-up to loading more datas,the follow version may be combined with animation and delete functions. Welcome to use it for everyone,and welcome suggestions.Thanks for the author of XListView's widget.

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