看看例子就行了
http://blog.csdn.net/ueryueryuery/article/details/17440465
http://www.cnblogs.com/jshen/p/4097445.html
json解析
http://www.open-open.com/lib/view/open1326376799874.html

```mListView.setOnRefreshListener(new OnRefreshListener2() {
@Override
public void onPullDownToRefresh(
PullToRefreshBase refreshView) {
// TODO Auto-generated method stub

        }
        @Override
        public void onPullUpToRefresh(
                PullToRefreshBase<ListView> refreshView) {
            // TODO Auto-generated method stub

        }
    });