Set queue for mediaSession so that it (mostly next song) can be read by other apps

app/src/main/java/code/name/monkey/retromusic/extensions/SongExtensions.kt

@@ -1,6 +1,20 @@
 package code.name.monkey.retromusic.extensions
 
+import android.support.v4.media.MediaDescriptionCompat
+import android.support.v4.media.session.MediaSessionCompat.QueueItem
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.util.MusicUtil
 
 val Song.uri get() = MusicUtil.getSongFileUri(songId = id)
+
+
+fun ArrayList<Song>.toMediaSessionQueue(): List<QueueItem> {
+    return map {
+        val mediaDescription = MediaDescriptionCompat.Builder()
+            .setMediaId(it.id.toString())
+            .setTitle(it.title)
+            .setSubtitle(it.artistName)
+            .build()
+        QueueItem(mediaDescription, it.hashCode().toLong())
+    }
+}

app/src/main/java/code/name/monkey/retromusic/service/MusicService.kt

@@ -56,6 +56,7 @@ import code.name.monkey.retromusic.appwidgets.*
 import code.name.monkey.retromusic.auto.AutoMediaIDHelper
 import code.name.monkey.retromusic.auto.AutoMusicProvider
 import code.name.monkey.retromusic.extensions.showToast
+import code.name.monkey.retromusic.extensions.toMediaSessionQueue
 import code.name.monkey.retromusic.glide.BlurTransformation
 import code.name.monkey.retromusic.glide.GlideApp
 import code.name.monkey.retromusic.glide.RetroGlideExtension.getDefaultTransition
@@ -1225,6 +1226,8 @@ class MusicService : MediaBrowserServiceCompat(),
                 songPlayCountHelper.notifySongChanged(currentSong)
             }
             QUEUE_CHANGED -> {
+                mediaSession?.setQueueTitle(getString(R.string.now_playing_queue))
+                mediaSession?.setQueue(playingQueue.toMediaSessionQueue())
                 updateMediaSessionMetaData() // because playing queue size might have changed
                 saveState()
                 if (playingQueue.size > 0) {