IssueTracker

Component used: androidx.media Version used: 1.2.0 Devices/Android versions reproduced on: API 21

I've set up a foreground service notification using NotificationCompat.MediaStyle with an attached MediaSessionCompat token as described in the Android blog here: https://android-developers.googleblog.com/2020/08/playing-nicely-with-media-controls.html

For modern devices this works without issues, the title and album art metadata (bitmap version) are correctly and automatically displayed in the notification.

For an API 21 device, the notification displays no title, and no album artwork. It instead appears to use the smallIcon defined on the notification builder in place of album art (screenshot attached).

The metadata is constructed like so:

suspend fun StreamData.getMediaMetadata(
    builder: MediaMetadataCompat.Builder = MediaMetadataCompat.Builder()
): MediaMetadataCompat = builder
    .putText(MediaMetadataCompat.METADATA_KEY_TITLE, this.title)
    .putBitmap(
        MediaMetadataCompat.METADATA_KEY_ALBUM_ART,
        this.thumbnailUrl?.toUri()?.getBitmap()
    )
    .build()

private suspend fun Uri.getBitmap(dispatcher: CoroutineDispatcher = Dispatchers.IO): Bitmap? =
    withContext(dispatcher) {
        try {
            val url = URL(this@getBitmap.toString())
            BitmapFactory.decodeStream(url.openConnection().getInputStream())
        } catch (ex: Exception) {
            null
        }
    }

The Notification is built as follows:

val style = MediaStyle()
    .setMediaSession(session.sessionToken)
    .setShowActionsInCompactView(0, 1)
    .setShowCancelButton(true)
    .setCancelButtonIntent(
        MediaButtonReceiver.buildMediaButtonPendingIntent(applicationContext, ACTION_STOP)
    )

    val builder = NotificationCompat.Builder(this, channelId)
        .setStyle(style)
        .setSmallIcon(R.drawable.small_icon)
        .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)

    when (session.controller.playbackState?.state) {
        STATE_PAUSED -> builder.addAction(playAction())
        else -> builder.addAction(pauseAction(currentStreamData.value?.isLive == true))
    }

    builder.addAction(stopAction())

Looking at the source for NotificationCompat.MediaStyle it appears that there's a divergence in behaviour between APIs 21-23 and API 24+. Given that things have shifted around a bit over the last few years into more granular androidx libraries, I'm wondering if a regression has been introduced somewhere, or if it's an issue with my usage of the library.