Proguard 下载地址:
https://www.guardsquare.com/en/products/proguard
https://blog.csdn.net/w15013761160/article/details/53080841
https://www.jianshu.com/p/b471db6a01af
https://blog.csdn.net/mengweiqi33/article/details/51736519
https://blog.csdn.net/aloh_a/article/details/50942751