public void add(int index, DraweeHolder<DH> holder) {
    Preconditions.checkNotNull(holder);
    Preconditions.checkElementIndex(index, mHolders.size() + 1);
    mHolders.add(index, holder);
    if (mIsAttached) {
      holder.onAttach();
    }
  }
Releases resources used to display the image.

<p>The containing view must call this method from both {@link View#onStartTemporaryDetach()}
and {@link View#onDetachedFromWindow()}.
drawee/src/main/java/com/facebook/drawee/view/MultiDraweeHolder.java