能从上下左右拉出的抽屉布局：
仿android 5.0侧滑菜单按钮动画：
详见博客：
抽屉：http://blog.csdn.net/a740169405/article/details/49720973
侧滑菜单动画：http://blog.csdn.net/a740169405/article/details/50285017
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