is there a process here about how much code to show, where to show it? can it be an Android app written in Kotlin?

If you want your code to be reviewed, just post the code/url here. no process whatsoever

Yeah, although personally I’m more likely to review a screen or less full of code, and less likely to review a full app since there are likely to be concerns that go beyond “help me make this code clear and succinct”

noted