Support for playing MIDI (.mid) files

cannot play MIDI (.mid) files.

Those .mid files could be played in PC windows using windows media player and some other music players, as well as in the native Android music player previewer in the native file manager, and in some installed music players on my Oppo Android phone which could play the music files by directory but only by a overall "music library".

Description

Expected behavior

click the .mid file item in the playlist and play the sound.

Actual behavior

clicked the .mid file item in the playlist, but not played, just jumped to the next item.

Steps to reproduce

1. add many .mid files to the playlist
2. click the item in the playlist to play
3. not playing the progress in fact.

Context

App version

3.1.1

Android version

5.1

Device model

oppo a37m

App mode

Smartphone