code: @Override
      public void setTarget(Object target) {
          for (Node node : mNodes) {
              Animator animation = node.animation;
              if (animation instanceof AnimatorSet) {
                  ((AnimatorSet)animation).setTarget(target);
              } else if (animation instanceof ObjectAnimator) {
                  ((ObjectAnimator)animation).setTarget(target);
              }
          }
      }
docs: Sets the target object for all current {@link #getChildAnimations() child animations}
  of this AnimatorSet that take targets ({@link ObjectAnimator} and
  AnimatorSet).
  
  @param target The object being animated