Let's Reverse Engineer an Android App! - Yasoob Khalid
How To Unpack And Repack Apk File On Android: Apk Tool - Techsable
Is it possible to unpack an .apk file, edit one or two files (.png), and then repack it without touching the other files? If yes, can I use the app? - Quora
[How to] unpack/edit/repack an apk using Winrar - YouTube