参考连接：
https://www.jianshu.com/p/96875c707f8a
用到的工具下载地址，系统需配置JAVA环境：
Apk-Tool:
https://www.wiyixiao4.com/tools/apktool.7z
Dex2Jar-Tool:
https://www.wiyixiao4.com/tools/dex-tools-2.1-SNAPSHOT.zip
https://www.wiyixiao4.com/tools/dex-tools-2.1-SNAPSHOT.tar
JD-GUI:
https://www.wiyixiao4.com/tools/jd-gui-windows-1.6.6.zip
原文：https://www.cnblogs.com/eliza209/p/12968485.html