android网络监听

http://blog.csdn.net/mxiaoyem/article/details/50857008

http://blog.csdn.net/ke1vin/article/details/51130380

http://www.jianshu.com/p/f61849073bad

http://blog.csdn.net/wangbaochu/article/details/45729143

https://github.com/ldoublem/LoadingView