apktool

Reverse engineer Android APK files to view and modify resources

brewmacoslinux

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Tool for reverse engineering 3rd party, closed, binary Android apps

apktool

Decompile an APK file to extract resources and smali code$ apktool d app.apk

Recompile modified APK contents back into an APK file$ apktool b app-folder -o modified.apk

Decode resources only without decompiling the dex files$ apktool d -r app.apk