Kotlin works perfectly fine for Android applications, it also allows you to mix it in with Java. I'd say try out both of them and see which of them you like and get on the most with. Personally I prefer to use Java but I find it more of finding your own rhythm and personal preferences.
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If I want to start Android dev. today, do you consider Kotlin is a safe path (vs Java)?
Kotlin works perfectly fine for Android applications, it also allows you to mix it in with Java. I'd say try out both of them and see which of them you like and get on the most with. Personally I prefer to use Java but I find it more of finding your own rhythm and personal preferences.