Things I want to do

• The app shows currently playing items
• The app allows reordering during the shuffle
• The result of reordering during the shuffle does not affect the song order before the shuffle

Current approach

• Get currently playing items from MediaControllerCompat.Callback#onQueueChanged
• Customize TimelineQueueEditor, ShuffleOrder
  • doesn't call Player#moveMediaItem when reorder during the shuffle
  • generate a new ShuffleOrder from the sorted result
  • call ExoPlayer#setShuffleOrder to update the sort order

Result

• When reordering several times while shuffling, the song order may not be reflected in MediaSession
• doesn't call MediaControllerCompat.Callback#onQueueChanged

Environment

• ExoPlayer:2.16.1
• Test Device:
  • Pixel 3(OS 12)
  • Pixel 4(OS 11)
  • Emulator(OS 10)
  • Sample Project

Sample Project

• https://github.com/mag0716/SamplePlayer

Question

• Is it correct behavior that sometimes MediaControllerCompat.Callback#onQueueChanged is not executed when ExoPlayer#setShuffleOrder is called?
• Is there a better approach to support reordering during the shuffle?