Ну вот и ВСЁ - котлин стал официальным языком под андроид наряду с джавой.
Starting now, Android Studio 3.0 ships with Kotlin out of the box, meaning Android developers no longer need to install any extras or worry about compatibility.
It also means that moving forward, you can rest assured that both JetBrains and Google will be supporting Android development in Kotlin.
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https://blog.jetbrains.com/kotlin/20...-now-official/