Kotlin is pretty cool generally, but I'm not so sure it would help the problems of Android development that much, since most of your time will be spent dealing

Kotlin is pretty cool generally, but I'm not so sure it would help the problems of Android development that much, since most of your time will be spent dealing with the plain-Java Android classes and how Android expects you to do things. You'd have to rearchitect the whole Android system in it to really make a difference, and if you're doing that already, it probably doesn't matter that much what language you're doing it in.