I looked at the video tutorial on "how we can use a MIDI controller to answer the ear training exercises of the app" from the official EarMaster youtube channel:
This is what the exercise settings sidebar looks like in the video:

And this is what the exact same screen looks like in my Android app:

I know that the video shows an older version of the app. However, the "MIDI in" switch does not exist in the sidebar settings of my app at all, nor can any similar settings be found in the main settings screen (the one that is accessed from the app's home screen).
I know that the issue is not in my MIDI controller, in the way the MIDI controller is connected to the Android device, nor in my Android device's general MIDI support. Other music apps using the same controller and device ask for permission to use the MIDI USB interface and then correctly register and respond to key presses on the MIDI controller.
Does the Android version of the EarMaster app support MIDI input? If yes, what are the steps to enable MIDI input?
If not, I would feel quite disappointed that the Android version of the app is the only one that lacks support for it.
I'm hoping that I just overlooked something trivial and we can resolve this quickly. : )