Kotlin is Google's preferred and supported language for Android developers. So why hire packages are so stupid high is beyond me? Hire a teenager still at school. But Kotlin spans much of the mobile development space, including Apple watch
Really, it's still Java under the hood,
https://en.m.wikipedia.org/wiki/Kotlin_(programming_language)#cite_note-auto-7
+ I suspect Google just wants to own everything, including the open source field - before MS and Amazon grab everything else with cloud and mobile scope. Why spend money developing your own Java libraries, when you can 'associate' yourself with a Github project
It's still worth checking out the salaries though, especially if you're a recent graduate with a STEM subject degree.
Personally, I did the
hello android app and moved towards iPhone stuff; the Android ecosphere is too unpredictable for long term product development and support: Change it today, change it tomorrow. Which might explain the stupid money corporates are willing to spend on skills, after they've fallen head first into the rabbit hole of Android integration.