addMediaItem(
                            MediaItem.Builder()
                                .setMediaId(track.id.toString())
                                .setMediaMetadata(
                                    MediaMetadata.Builder()
                                        .setTitle(track.name)
                                        .setArtist(track.ar.joinToString(", ") { ar -> ar.name })
                                        .setMediaUri(Uri.parse("$RainMusicProtocol://music?id=${track.id}"))
                                        .setArtworkUri(Uri.parse(track.al.picUrl))
                                        .build()
                                )
                                .build()
               )