问题描述：
系统：kali 1.9
# apktool d 123.apk test
Input file (123.apk) was not found or was not readable.
问题解决方法：
方法1、If any body else uses the apktool in kali you need to put the apk into apktool's directory which is located in /usr/share/apktool, where as in bt5 you cd to any directory, call the tool and decompile
方法2、使用绝对路径：
apktool d /root/test/123.apk /root/test/test
搞定～