Android Question sounds on background

I am trying to move my sound alerts from webview to app, in webview the sounds are working even when app is on the background.

But when I move them to the app. and call them with JS interface everything works except the time when the app is on the background

at least on Android 8+ I didnt try older ones yet..

How I should proceed ?
I am using audilib and soundpool everything is fine except bloody background mode.

thanks