This webpage might be helpful for building on Android using tier 2. It's not a tutorial, but it could give some solid guidance. I haven't found any AppGameKit tutorials that are specific to Android and using tier 2.
https://www.appgamekit.com/documentation/guides/25_android.htm
EDIT: I also found these online tutorials on YouTube.com, but even though they address AppGameKit tier 2 they are not specifically tailored to the Android OS as the target platform. But even so, they probably are pertinent to AppGameKit projects that are targeting Android OS.
AGK tutorial tier 2 ios vid #1 - YouTube
https://www.youtube.com/watch?v=ykviNJutCKQ
AGK: Writing From Scratch In Tier 2 - YouTube
https://www.youtube.com/watch?v=upZpNwVgEXk
AGK: Porting AppGameKit Tier 1 to Tier 2 Easily - YouTube
https://www.youtube.com/watch?v=hMwkvCQ0910
That would be neat if someone created such a tutorial (AGK tier 2 specifically for Android OS Apps)