APK Editor is a powerful tool that can edit/hack apk files to do lots of things for fun. It can help us to do things like string localization, background image replacement, layout re-architecting, and even ad eliminating, permission removing, etc. What it can do depends on how you use it. However, to use it well, we need a little bit professional skills. Don't be afraid, some examples are given in the help page. (Note: Manifest editing is not supported in free version)
V1.8.20: Could put apk build to background UI improve and bugs fix V1.8.17: improved text editor aync project save/load bugs fix V1.8.15: upgrade android.jar to Android O updated resource building program faster for big file editing can view the file which cause compile error bugs fix