1.去http://sourceforge.net/projects/dex2jar/ 下載一個新版本dex2jar. 目前是2.0，下載后文件名dex2jar-2.0.zip
2.可以到這里看看用法：
http://sourceforge.net/p/dex2jar/wiki/Faq/
http://sourceforge.net/p/dex2jar/wiki/UserGuide/
3.解壓縮dex2jar-2.0.zip 到文件夾dex2jar-2.0
4.注意修改文件屬性為可執行文件:
chmod +x /home/.../d2j-dex2jar.sh /home/.../d2j_invoke.sh
5.輸入命令
sudo sh /home/.../dex2jar-version/d2j-dex2jar.sh /home/.../someApk.apk
6.在命令文件夾下面即可看到someApk.jar文件包