Always-on Display Is Not Updated Dynamically

Media3 Version

1.0.0-beta03

Devices that reproduce the issue

• Pixel 4a running Android 13

Devices that do not reproduce the issue

No response

Reproducible in the demo app?

Yes

Reproduction steps

I maintain an Android radio app. The app displays the currently playing song in the notification. Media3 automatically updates the notification when no Title has been set in MediaMetadata of a MediaItem - which is pretty neat (see also #153).

The Always-on Display on the other hand is not automatically updated.

To reproduce:

1. turn on the Always-on Display in Settings > Display > Lock screen > Always show time and info on the testing device
2. modify the demo-session app to not set a title in MediaItemTree.kt
3. play back a radio station via the demo-session app
4. the Notification is updated dynamically ✅
5. turn off the display to see if the title is updated dynamically in the Always-on Display

Expected result

In the Always-on Display the same Title should be displayed as in the Notification.

Actual result

The Always-on Display displays "No title", when a title has not been set.

The photos above are from a fork of the demo-session app (see https://github.com/y20k/media3/commit/2e722acef9dbf7c7bc5f079c1605b779e2d42dae).

Media

I added a radio station to demos/session/src/main/assets/catalog.json in a fork of the demo app to test the issue.

Bug Report

• You will email the zip file produced by adb bugreport to dev.exoplayer@gmail.com after filing this issue.