Android代码混淆

参考文档：
http://www.open-open.com/lib/view/open1455962444808.html
http://blog.csdn.net/fengyuzhengfan/article/details/43876197
http://blog.csdn.net/lovexjyong/article/details/24652085
看完差不多就懂了。。。哈哈