android listview 上下滑动刷新
可实现listview上拉加载刷新，/***Android下拉刷新自动加载更多*@authormzba**/publicclassPullToRefreshActivityextendsListActivity{privateLinkedListmListItems;privateNewsAdapteradapter;privateintlastItem;@OverridepublicvoidonCreate(BundlesavedInstanceState){