why Loadmore call only once

[meablelee2013]

why Loadmore call only once ,my code is :
waterfallView.setOnLoadMoreListener(new OnLoadMoreListener() {

        @Override
        public void onLoadMore() {
            // TODO Auto-generated method stub
            Toast.makeText(MainActivity.this, "more", 2000).show();

            List<String> moreList = new ArrayList<String>();

            moreList.add("http://f.hiphotos.baidu.com/image/pic/item/8601a18b87d6277f1b4b883e2a381f30e924fc5f.jpg");

            adapter.addFootList(moreList);
            waterfallView.onLoadMoreComplete();
        }
    });

the adapter is :
public void addFootList(List moreList) {
this.list.addAll(moreList);
this.notifyDataSetChanged();
}
who can help me,thanks.

[meablelee2013]

I fixed it.
On the MultiColumnListView.java ,the onScrollStateChanged is like this ,when call loadMoreListener.onLoadMore();and no matter you call waterfallView.onLoadMoreComplete() or not to set the loadingMoreComplete=true,then call loadingMoreComplete = false;so the loadingMoreComplete is allway false when loadmore another,time ,so let loadingMoreComplete = false before loadMoreListener.onLoadMore(),then the issue would ok

public OnScrollListener scroller = new OnScrollListener() {
private int visibleLastIndex = 0;
private static final int OFFSET = 2;

    @Override
    public void onScrollStateChanged(PLA_AbsListView view, int scrollState) {
        int lastIndex = getAdapter().getCount() - OFFSET;
        if (scrollState == OnScrollListener.SCROLL_STATE_IDLE
                && visibleLastIndex == lastIndex && loadingMoreComplete) {

            loadMoreListener.onLoadMore();
            loadingMoreComplete = false;

        }
    }

    @Override
    public void onScroll(PLA_AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        // visibleLastIndex = firstVisibleItem + visibleItemCount - 1;
        visibleLastIndex = firstVisibleItem + visibleItemCount - OFFSET;
    }
};

the correct is like this
@OverRide
public void onScrollStateChanged(PLA_AbsListView view, int scrollState) {
int lastIndex = getAdapter().getCount() - OFFSET;
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE
&& visibleLastIndex == lastIndex && loadingMoreComplete) {
loadingMoreComplete = false;
loadMoreListener.onLoadMore();
}
}