@Stefan It appears your question is about Android APIs (the fact that you are writing in Kotlin is only incidental to the question). If that is the case, you'd be better off asking either somewhere that focuses on android (such as the above mentioned Android United) or on Stack Overflow, depending on the nature of your question.
If we misunderstood and your question is indeed Kotlin specific (not everyone here is an Android developer after all), that's just fine, but you'd probably be better off asking in a more topic related channel on this slack (e.g. #android).