Reverse Engineering : Procedure (Step by step) for decoding Android .apk files

What is APK file ?

Android application package file (APK) is the file format used to distribute and install application software and middleware onto Google’s Android operating system.APK files are ZIP file formatted packages based on the JAR file (Java Programming Language) format, with .apk file extensions.

What is reverse engineering ?

Reverse engineering is taking apart an object to see how it works