Block of code to start/stop offline download

DownloadTracker.java

public void toggleDownload(
      FragmentManager fragmentManager, 
      MediaItem mediaItem, 
      RenderersFactory renderersFactory
      ) {
    Download download = downloads.get(checkNotNull(mediaItem.localConfiguration).uri);
    if (download != null && download.state != Download.STATE_FAILED) {
     DownloadService.sendRemoveDownload(
              /* context= */  context,
              /* DownloadService= */  OfflineVideoDownloadService.class,
              /* id= */ download.request.id,
              /* foreground= */ false
      );
    } else {
      if (startDownloadDialogHelper != null) {
        startDownloadDialogHelper.release();
      }
      DownloadHelper helper =
              DownloadHelper.forMediaItem(
                      context,
                      mediaItem,
                      renderersFactory,
                      dataSourceFactory
              );
      startDownloadDialogHelper =
              new StartDownloadDialogHelper(
                      /* fragmentManager= */fragmentManager,
                      /* downloadHelper= */ helper,
                      /* mediaItem= */mediaItem
              );
    }
  }