I am trying to develop an Android app that uses two separate monitors. My current setup is one Odroid box connected to two different monitors with HDMI cables. I know how to create an app with Exoplayer to play it on one monitor, but I cannot find any clues on playing different videos on each screen simultaneously. Is this feasible? If so which class should I use to achieve this?
This seems to be the feature you're looking for:
https://developer.android.com/guide/topics/large-screens/multi-window-support#multi-display
Note that it will only work in Android 10+. That's because you need both screens to be in the resumed state if both are going to display videos simultaneously.