http://yelinsen.iteye.com/blog/977736
http://www.51testing.com/html/68/n-197668.html
http://mintelong.iteye.com/blog/460903
http://mintelong.iteye.com/blog/460903
http://www.moandroid.com/?p=1246
http://www.oschina.net/question/163910_27058
http://blog.csdn.net/xianming01/article/details/8286603