That's fair. There are a few pros, though, one of which being that JetBrains is fully behind Android, and as a consequence, the Kotlin runtime is very small. D

That's fair. There are a few pros, though, one of which being that JetBrains is fully behind Android, and as a consequence, the Kotlin runtime is very small. Do you know how many methods Groovy's is? I think you will also find out that Groovy's performance is going to be a problem on Android, but maybe it will be fast enough for you.