APK Editor Pro APP
lets you do exactly what its name indicates: edit any APK saved to your device. And if you don't have the APK itself, you can extract it from any app that you have installed.
When used well it can bring you lots of joy, but if used poorly... not so much. In any case, you can find some examples and advice for using the app correctly on the app's help page.
APK editor takes you deep into your APK files from installed apps then enables you to edit. You can extract Dex files as well as classes faster