Renaming “java” directory to “kotlin” in Android Studio

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Update (2)

If you are using

Android Studio Arctic Fox version 2020.3.1 Beta 2

and

Gradle Plugin version 7.0.0-beta02

you are good to go and can just put put your code in src/main/kotlin.
Android Studio shows it as kotlin in the file tree. No need for adding the directory to the sourceSet as shown below.

Android Studio Arctic Fox file tree

Update (1)

Kotlin is finally coming to AndroidSourceSet. If you use the latest Android Gradle Plugin version 7.0 alpha, you can use:

android.sourceSets.all {
    kotlin.srcDir("src/$name/kotlin")
}

This works fine in Android Studio 3.6.2 and should be the most versatile solution until AndroidSourceSet starts supporting Kotlin directly. Just add the following snippet at the end of your app/build.gradle[.kts]:

android.sourceSets.all {
    java.srcDir("src/$name/kotlin")
}

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