[android] Android - How to decode and decompile any APK file?

I'm working on ads: my customers gave me some APK files of their Apps.
My work consists of inserting ad banners into them.
After closing the ad banners, these apps will run.

My question is: How to decode and decompile APK file?

This question is related to android decode decompiler apk

The answer is

You can try this website http://www.decompileandroid.com Just upload the .apk file and rest of it will be done by this site.

Source: Stackoverflow.com

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