How do I debug an APK file?

To start debugging an APK, click Profile or debug APK from the Android Studio Welcome screen. Or, if you already have a project open, click File > Profile or Debug APK from the menu bar. In the next dialog window, select the APK you want to import into Android Studio and click OK.

What is a debug app?

A “debug app” is the app that you want to debug. … By the time you see this dialog, you can (set break up points and) attach your debugger, then the app launch will resume. There are two ways you can set your debug app – via the developer options in your device settings or via an adb command.