参考：http://blog.csdn.net/wxg630815/article/details/6989316

http://blog.csdn.net/wxg630815/article/details/6989642

http://blog.csdn.net/dalancon/article/details/9701855

http://blog.csdn.net/jincf2011/article/details/6344678

Android 资源文件中@、@android:type、@*、？、@+含义和区别

http://www.360doc.com/content/12/1126/09/7724936_250261892.shtml

Android 自定义组件