Best MP3 player?

[AC Question]

I have an Android 5.0.1 smartphone. I'm looking for an mp3 player app (also play flacs, etc) which will behave like my old sansa clip. Most important features 1) remember the position where I stopped listening to a given file, and resume there when I replay that file, even if I have shut the app off & turned it back on days later (I listen to long audio books, etc. while walking & don't want to have to fast forward to the last stopping point) 2) have shuffle play for my hundreds of music files 3) realize that it's a PHONE & not my MOMMY, and therefore does not do things like automatically turn down the volume when I plug in a headset or speakers. My current app not only does this, it will even SHUT OFF the audio mid-listen (20 - 30 minutes in), and REFUSE to turn it back on until I "acknowledge" that "listening to headphones at a high volume can damage hearing". Any suggestions?

TIA

D