Notification.MediaStyle如何显示播放哪个媒体播放器的进度？

NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
        .setContentTitle("正在播放音乐")
        .setContentText("歌曲名称")
        .setStyle(new NotificationCompat.MediaStyle()
                .setMediaSession(mediaSession.getSessionToken())
                .setShowActionsInCompactView(0, 1, 2))
        .setShowCancelButton(true)
        .setCancelButtonIntent(cancelIntent)
        .setSmallIcon(R.drawable.ic_notification)
        .setLargeIcon(largeIcon)
        .addAction(R.drawable.ic_previous, "上一首", previousIntent)
        .addAction(R.drawable.ic_pause, "暂停", pauseIntent)
        .addAction(R.drawable.ic_next, "下一首", nextIntent)
        .setProgress(100, 50, false);

Notification notification = builder.build();