apps-android-wikipedia VS VinylMusicPlayer

and theirs also the Wikipedia app which is open source. Here's the GitHub page, [https://play.google.com/store/apps/details?id=org.wikipedia](and here's the google play listing)

Here is how the Wikipedia Android app handles that use case. It's in Kotlin, but it should give you an idea of how to implement.

You should try Vinyl Music Player from GitHub. Works best for offline files.

try vinyl music player, way better https://github.com/VinylMusicPlayer/VinylMusicPlayer

Another is Vinyl, which doesn't support Material You, but have a decent support of .wav music. Some users have some troubles, but Vinyl works on my phone. But, again, it doesn't support Material You.

Vinyl: F-droid || GitHub

Tbh i just use vinly as alternative player, i think no.3 which you mentioned got fixed in 2021 release and new bugs also got fixed in this release, i would suggest you to try vinyl as it recently recieved update and currently active, you can always fall back to phonograph plus if you don't like it :) Here is release changelogs

Vinyl Music Player (version 1.4.0): Light and slick material design music player

Vinyl Music Player may be what you are looking for.