code: @Override
      public void setInterpolator(/*Time*/Interpolator interpolator) {
          for (Node node : mNodes) {
              node.animation.setInterpolator(interpolator);
          }
      }
docs: Sets the TimeInterpolator for all current {@link #getChildAnimations() child animations}
  of this AnimatorSet.
  
  @param interpolator the interpolator to be used by each child animation of this AnimatorSet