As Fernando  said 

"Keep in mind that there are NO silver bullets and of course there is always room for improvement, although this should be useful as a starting point.

And some advice:

• Do not over think (do not do over-engineering).
• Be pragmatic.
• Minimize framework (android) dependencies in your project as much as you can.
• Continuous improvement through refactor.
• Do not write code without tests (I should not be saying this in 2018 :)). "

https://fernandocejas.com/blog/engineering/2019-05-08-architecting-android-reloaded/