With the availability of Kotlin, Groovy or (somewhat limited I believe, but still) Scala on Android

Did you mean "With the availability of Kotlin, (somewhat limited, but still) Groovy or (also somewhat limited I believe) Scala on Android"? Groovy is used widely for scripting builds in Gradle-based AndroidStudio, but it's use replacing Java for writing actual apps for Android is very recent, still buggy, and not widely used. Don't confuse the two uses of Groovy in Android.