android style and animator demo
selector 相关说明 http://blog.csdn.net/felix_wangq/article/details/50380056
shape http://blog.csdn.net/felix_wangq/article/details/50380077
drawable http://blog.csdn.net/felix_wangq/article/details/50380142
layer-list http://blog.csdn.net/felix_wangq/article/details/50380166
animator http://blog.csdn.net/felix_wangq/article/details/50380156