Since decades, I trust foobar2000 to play my files on (almost) every desktop & mobile computer.
Pros:
- comes with an integrated media manager, doesn’t use Android’s
- plays almost everything, with DSP and RealPlayGain
- can be downloaded as apk
Cons:
- not FOSS, but it’s clean
- have to go to Settings/Media Library to add & scan sources (ie. local folder)
Support here.