1.去http://sourceforge.net/projects/dex2jar/ 下载一个新版本dex2jar. 目前是2.0，下载后文件名dex2jar-2.0.zip
2.可以到这里看看用法：
http://sourceforge.net/p/dex2jar/wiki/Faq/
http://sourceforge.net/p/dex2jar/wiki/UserGuide/
3.解压缩dex2jar-2.0.zip 到文件夹dex2jar-2.0
4.注意修改文件属性为可执行文件:
chmod +x /home/.../d2j-dex2jar.sh /home/.../d2j_invoke.sh
5.输入命令
sudo sh /home/.../dex2jar-version/d2j-dex2jar.sh /home/.../someApk.apk
6.在命令文件夹下面即可看到someApk.jar文件包