媒体会话具有“无标题".在AOD上(始终显示) [英] Media session has "no title" on AOD (Always on display)

问题描述

在我的应用中，我显示了一个前台服务的通知，该服务负责播放音乐.该通知由 com.google.android.exoplayer2.ui.PlayerNotificationManager android.support.v4.media.session.MediaSessionCompat com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector

In my app I displayed a notification with a foreground service, which is in charge of playing music. The notification is handled by com.google.android.exoplayer2.ui.PlayerNotificationManager android.support.v4.media.session.MediaSessionCompat com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector

    mediaSession = MediaSessionCompat(this, "Player", null, null)
    mediaSession.isActive = true
    mediaSessionConnector = MediaSessionConnector(mediaSession)
    mediaSessionConnector.setPlayer(exoPlayer)
    playerNotificationManager = PlayerNotificationManager.createWithNotificationChannel(
            this,
            "notification_channel_player",
            R.string.notification_channel_name_player,
            0,
            PLAYER_NOTIFICATION_ID,
            object : PlayerNotificationManager.MediaDescriptionAdapter {
                override fun createCurrentContentIntent(player: Player?): PendingIntent? {
                    // intent
                }

                override fun getCurrentLargeIcon(player: Player?, callback: PlayerNotificationManager.BitmapCallback?): Bitmap? {
                    // large icon
                }

                override fun getCurrentContentText(player: Player?): String? {
                    // artist
                }

                override fun getCurrentContentTitle(player: Player?): String {
                    // title
                }

            },
            object : NotificationListener {
                override fun onNotificationPosted(notificationId: Int, notification: Notification?, ongoing: Boolean) {
                    startForeground(notificationId, notification)
                }
            })

    playerNotificationManager.setSmallIcon(R.drawable.ic_notification)
    // has previous and next
    playerNotificationManager.setUseNavigationActions(true)
    playerNotificationManager.setUseNavigationActionsInCompactView(true)
    // no fast-forward and rewind
    playerNotificationManager.setFastForwardIncrementMs(0)
    playerNotificationManager.setRewindIncrementMs(0)
    // no stop
    playerNotificationManager.setUseStopAction(false)

    playerNotificationManager.setMediaSessionToken(mediaSession.sessionToken)
    playerNotificationManager.setPlayer(exoPlayer)

打开屏幕时，显示内容标题和文本没有问题.但是，当我锁定屏幕并处于AOD模式时，在Pixel 3上我看到显示无标题".但是，如果我使用Apple Music，它会很好地显示标题和艺术家.

When the screen is on, there is no problem displaying the content title and text. But when I lock screen and in AOD mode, on my Pixel 3 I see a "No title" displayed. But if I use Apple Music, it displays the title and artists very well.

我的应用程序:

Apple音乐:

我的问题是，如何根据当前的实现配置此标题和文本?谢谢.

My question is, how can I configure this title and text based on my current implementation? Thanks.

推荐答案

我只是回答自己的问题，因为我已经找到并解决了问题.

I just answer my own question because I have found and solved the problem.

我只设置了通知的媒体描述适配器，但实际上，媒体会话也需要设置元数据.由于我们使用的是 mediaSessionConnector ，因此可以通过将 QueueNavigator 传递给 mediaSessionConnector 来进行设置，因此我们可以使用播放器实例和窗口索引来建立当前媒体的元数据.e.x:

I have only set the notification's media description adapter, but in fact, the media session needs to set metadata too. Since we are using mediaSessionConnector, it can be setup by passing a QueueNavigator to the mediaSessionConnector, so we can use the player instance and window index to build current media's metadata. e.x:

    val timelineQueueNavigator = object : TimelineQueueNavigator(mediaSession) {
        override fun getMediaDescription(player: Player?, windowIndex: Int): MediaDescriptionCompat {
            player?.let { safePlayer ->
                return MediaDescriptionCompat.Builder().apply {
                    setTitle("......")
                    setSubtitle("......")
                }.build()
            }
            return MediaDescriptionCompat.Builder().build()
        }
    }
    mediaSessionConnector.setQueueNavigator(timelineQueueNavigator)

另一点是，默认情况下， mediaSessionConnector 使用 MediaSessionConnector.DefaultMediaMetadataProvider .它没有设置 METADATA_KEY_ARTIST ，它将在AOD模式下用作艺术家.因此，我创建了自己的MediaMetadataProvider，添加了 METADATA_KEY_ARTIST .

Another point is, by default the mediaSessionConnector use MediaSessionConnector.DefaultMediaMetadataProvider. It doesn't setup METADATA_KEY_ARTIST which will be used in AOD mode as the artist. So I have created my own MediaMetadataProvider, adding METADATA_KEY_ARTIST.

if (description.subtitle != null) {
    val subTitle = description.subtitle.toString()
    builder.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, subTitle)
    builder.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_SUBTITLE, subTitle)
}

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