Ahh.. Yes. There is quite a bit that goes into showing popups in a android application. It might be best to stick with this sample for the time being.
I did work on this sample which shows popups in a webmap but it again, takes a lot of work on the implementers part to get it working correctly:
GitHub - nohe427/KtPopup: Kotlin Popups
Recently, the SDK documentation team has asked for feedback regarding the SDK documentation.
Would you be interested in emailing me some feedback about the Android SDK documentation and using it to accomplish your goals? (include level of development experience, how easy or difficult was it to find what you were looking for, etc...)
anohe@esri.com