In recent Google I/O 2017, Kotlin has been announced as the official development language of Android by Google. And now, it's time to support Kotlin in Code Runner!
Kotlin tools will be included with Android Studio 3.0 by default, and JetBrains and Google are pledging to support the language going forward. Kotlin as a language has a lot of similarities to Java in structure. Moreover, Kotlin adds a lot of nice-to-have features, a much cleaner syntax, ideas from functional programming, and other enhancements over Java. Come to VS Code and have a try! Let me know your feedback.