I was finally able to work out some of the sdcard write issues. I could only reproduce issues when creating playlists, so hopefully that was the only problem. I also tested with android O (the emulator) and didnt experience any issues, so GMMP should be good to go for 8.0
2.2.4 (08/29/2017):
-Updated google services to 11.0.4
-Updated support libraries to 26.0.0
-Updated compile sdk to Android O
-Fixed bug where keyboard would not show when using a gesture to jump to search
-Play next/prev album now orders by album name instead of by artist (use next/prev album by artist for other behavior)
-Reset anything set to next/prev album to next/prev album by artist
-Notification will now properly update state when queue completes with on queue completion set to default or stop
-Audio focus is now only abandoned when the music service is destroyed
-Fixed audioengine startup race condition deadlock
-Fixed creating new files on sdcard (playlists / downloaded album art)
-Fixed issue where some m4a files would play at the incorrect sample rate
2.2.3 (05/02/2017):
-Update google services to 10.2.4
-Fixed some audioengine crashes
-Fixed other various crashes and bugs
2.2.4 (08/29/2017):
-Updated google services to 11.0.4
-Updated support libraries to 26.0.0
-Updated compile sdk to Android O
-Fixed bug where keyboard would not show when using a gesture to jump to search
-Play next/prev album now orders by album name instead of by artist (use next/prev album by artist for other behavior)
-Reset anything set to next/prev album to next/prev album by artist
-Notification will now properly update state when queue completes with on queue completion set to default or stop
-Audio focus is now only abandoned when the music service is destroyed
-Fixed audioengine startup race condition deadlock
-Fixed creating new files on sdcard (playlists / downloaded album art)
-Fixed issue where some m4a files would play at the incorrect sample rate
2.2.3 (05/02/2017):
-Update google services to 10.2.4
-Fixed some audioengine crashes
-Fixed other various crashes and bugs