lib-manipulation/src/main/java/com/nhaarman/listviewanimations/itemmanipulation/expandablelistitem/ExpandableListItemAdapter.java
public void expand(final int position) {
        long itemId = getItemId(position);
        if (mExpandedIds.contains(itemId)) {
            return;
        }

        toggle(position);
    }
public void expand(final int position) {
        long itemId = getItemId(position);
        if (mExpandedIds.contains(itemId)) {
            return;
        }

        toggle(position);
    }
Expand the view at given position. Will do nothing if the view is already expanded.

@param position the position to expand.