code: @NonNull
      public TransitionSet setOrdering(int ordering) {
          switch (ordering) {
              case ORDERING_SEQUENTIAL:
                  mPlayTogether = false;
                  break;
              case ORDERING_TOGETHER:
                  mPlayTogether = true;
                  break;
              default:
                  throw new AndroidRuntimeException("Invalid parameter for TransitionSet " +
                          "ordering: " + ordering);
          }
          return this;
      }
docs: Sets the play order of this set's child transitions.
  
  @param ordering {@link #ORDERING_TOGETHER} to play this set's child
  transitions together, {@link #ORDERING_SEQUENTIAL} to play the child
  transitions in sequence.
  @return This transitionSet object.