code: public void setTransition(@NonNull Scene scene, @Nullable Transition transition) {
          mSceneTransitions.put(scene, transition);
      }
docs: Sets a specific transition to occur when the given scene is entered.
  
  @param scene      The scene which, when applied, will cause the given
  transition to run.
  @param transition The transition that will play when the given scene is
  entered. A value of null will result in the default behavior of
  using the default transition instead.