Notification setStyle not working in sdk30

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MediaSessionCompat mediaSessionCompat = new MediaSessionCompat(ctx, "tag");

When I set .style(), notification is not output. Is there anything in the mediaSessionCompat that you need to do other than setting context and tag?

Solution

If you use the setStyle method on a notification, you need to provide the MediaSession with Metadata.

private void updateMetadata () {
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
                                     .putString(MediaMetadataCompat.METADATA_KEY_ARTIST, song.getArtistTitle())
                                     .putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ARTIST, song.getArtistTitle())
                                     .putString(MediaMetadataCompat.METADATA_KEY_ALBUM, song.getAlbumTitle())
                                     .putString(MediaMetadataCompat.METADATA_KEY_TITLE, song.getTitle())
                                     .putLong(MediaMetadataCompat.METADATA_KEY_DURATION, song.getDuration())
                                     .putLong(MediaMetadataCompat.METADATA_KEY_TRACK_NUMBER, getPosition())
                                     .putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, null)
                                     .build());
}

Don't forget to call this method, for example when your data changes. I don't know how you handle that so I can't provide a correct place for it. I'd say the same place you update the notification when a song changes and it's only a suggestion.