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Beginning with Kotlin and it's...
(sh.itjust.works)
Post funny things about programming here! (Or just rant about your favourite programming language.)
It's perfectly fine to continue to write Android apps in Java, doing that will continue to be supported for all foreseeable future and I do it myself for a hobby app that I maintain.
That said, there are good reasons for the increasing popularity of Kotlin, it's certainly a good language that has noticeable advantages over Java.