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

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

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

To decompile APK Use APKTool.
You can learn how APKTool works on http://www.decompileandroid.com/ or by reading the documentation.

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• Application Installation Failed in Android Studio • Difference between signature versions - V1 (Jar Signature) and V2 (Full APK Signature) while generating a signed APK in Android Studio? • Session 'app': Error Installing APK • Android Error Building Signed APK: keystore.jks not found for signing config 'externalOverride' • Build and Install unsigned apk on device without the development server? • The APK file does not exist on disk • Android Studio: Application Installation Failed • How to retrieve Key Alias and Key Password for signed APK in android studio(migrated from Eclipse) • ADB Install Fails With INSTALL_FAILED_TEST_ONLY • Upload failed You need to use a different version code for your APK because you already have one with version code 2