apk: analysis

1) apktool ( apktool d filename.apk)

• convert apk to human readable
• AndroidManifest.xml    
• .smali(class file into java byte code)

2)  dex2jar (d2j-dex2jar.sh filename.apk)

• convert apk to standard jar file.

3) jd-gui

• convert jar(.class) file to java code
• (NO AndroidManifest.xml; need to use apktool)

ref:  http://blog.nviso.be/2013/06/step-by-step-analysis-of-android.html