code: @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
      public static MediaRouter getMediaRouter(Context context) {
          return (MediaRouter) context.getSystemService(Context.MEDIA_ROUTER_SERVICE);
      }
docs: Get the {@link android.media.MediaRouter} service for this context.
  @param context the context.
  @return the {@link android.media.MediaRouter}