Getting Started with Kotlin
We have never added a new programming language to Android… until now! With Android Studio 3.0 we are officially supporting Kotlin for creating Android apps. Learn how to start a new project with the Kotlin language enabled or how to convert your existing classes using the Convert Java file to Kotlin refactoring.
For more information about the language syntax and idioms, refer to our blog post: https://android-developers.googleblog.com/2017/05/android-announces-support-for-kotlin.html
via Android Developers