apktool && apksigner

## Retreive manifest file and samili files in new directory.

apktool d mobile-application.apk

## Build a apk file after making modifications.

apktool b mobile-application-modified/ -output ./mobile-application-modified.apk

## Sign it after it's finished building.

apksigner sign --ks ~/.android/debug.keystore mobile-application-modified.apk