lib-manipulation/src/main/java/com/nhaarman/listviewanimations/itemmanipulation/animateaddition/AnimateAdditionAdapter.java
public void insert(final int index, @NonNull final T... items) {
        Pair<Integer, T>[] pairs = new Pair[items.length];
        for (int i = 0; i < items.length; i++) {
            pairs[i] = new Pair<>(index + i, items[i]);
        }
        insert(pairs);
    }
public void insert(final int index, @NonNull final T... items) {
        Pair<Integer, T>[] pairs = new Pair[items.length];
        for (int i = 0; i < items.length; i++) {
            pairs[i] = new Pair<>(index + i, items[i]);
        }
        insert(pairs);
    }
Inserts items, starting at given index. Will show an entrance animation for the new items if the newly added items are visible.
Will also call {@link Insertable#add(int, Object)} of the root {@link android.widget.BaseAdapter}.

@param index the starting index the new items should be inserted at.
@param items the items to insert.