https://github.com/telly/FloatingAction
http://www.csdn.net/article/2014-11-21/2822753-material-design-libs/1
android 属性动画的开源代码：
http://www.jcodecraeer.com/a/opensource/2014/1012/1746.html
Material Design设计的开源代码
原文：http://www.cnblogs.com/androidsuperman/p/4122094.html
