private var controller: MediaController? = null
private var mediaControllerFuture: ListenableFuture<MediaController>? = null

@UnstableApi
  private fun initializeMediaController() {
        val sessionToken =
            SessionToken(this, ComponentName(this, SongPlayerService::class.java))
        mediaControllerFuture = MediaController.Builder(this, sessionToken).buildAsync()
        mediaControllerFuture?.apply {
            addListener(Runnable {
                controller = get()
            }, MoreExecutors.directExecutor())
        }
    }