- unzip program.apk classes.dex
- Download https://github.com/pxb1988/dex2jar
- Run
dex2jar/dex2jar.sh ./classes.dex
- Download http://jd.benow.ca/
- Run
./jd-gui classes.dex.dex2jar.jar
Ref: http://pof.eslack.org/2011/02/18/from-apk-to-readable-java-source-code-in-3-easy-steps/