@Override
    public Object getItem(int position) throws ArrayIndexOutOfBoundsException {
        Position adapterPosition = translatePosition(position);
        if (adapterPosition.mPosition == POSITION_FILLER
                || adapterPosition.mPosition == POSITION_HEADER) {
            // Fake entry in view.
            return null;
        }

        return mDelegate.getItem(adapterPosition.mPosition);
    }
Get the data item associated with the specified position in the data set.
<p>
Since this wrapper inserts fake entries to fill out items grouped by
header and also spaces to insert headers into some positions will return
null.
</p>

@param position Position of the item whose data we want within the
           adapter's data set.
@return The data at the specified position.
Library/src/com/tonicartos/widget/stickygridheaders/StickyGridHeadersBaseAdapterWrapper.java