title: Android - How to decode and decompile any APK file?
body: <p>I'm working on ads: my customers gave me some APK files of their Apps.<br>
  My work consists of inserting ad banners into them.<br>
  After closing the ad banners, these apps will run. </p>
  
  <p>My question is: How to decode and decompile APK file?</p>