code: public ArrayList<Animator> getChildAnimations() {
          ArrayList<Animator> childList = new ArrayList<Animator>();
          for (Node node : mNodes) {
              childList.add(node.animation);
          }
          return childList;
      }
docs: Returns the current list of child Animator objects controlled by this
  AnimatorSet. This is a copy of the internal list; modifications to the returned list
  will not affect the AnimatorSet, although changes to the underlying Animator objects
  will affect those objects being managed by the AnimatorSet.
  
  @return ArrayList<Animator> The list of child animations of this AnimatorSet.