please consider to implement audiofocus

[JanuszChmiel]

Dear elite Java developers in this team.
As every one of us very probably know, it is A very good practice to implement Audiofocus change in all audio apps which are using audio output for a longer time. To prevent that multiple audio applications will play multiple sounds at once.
Does somebody of us thing, that audiofocus change could be implemented by using JNI, Psascal and Java?
Some code examples related to Audiofocus for An development inspiration.
https://www.sitepoint.com/a-step-by-step-guide-to-building-an-android-audio-player-app/
A good example when to use Audiofocus change listenner is Internet radio player app.
Or Media player, or game which uses audio.
Thank you very very much for your reaction.