1 http://blog.csdn.net/t12x3456/article/details/8160128
2 http://www.cnblogs.com/androidez/archive/2013/03/12/2956107.html
3 http://blog.csdn.net/xiaanming/article/details/8966621
4 http://blog.csdn.net/guolin_blog/article/details/8769904
