My android project is written 100% in Kotlin and I wanted to rename the java directory to kotlin to be consistent. I added
sourceSets{ main.java.srcDirs +=
even if it is supported in android studio, kotlin is still a plugin and v3.4 has the same behavior.
android studio
kotlin
the solution:
sourceSets{ main.java.srcDirs += 'src\\main\\kotlin\\' }
in settings.gradle or local.properties works for me (windows)
settings.gradle
local.properties