内存缓存 数据库缓存xlistview上拉刷新下拉加载

public class ShowFragment extends Fragment {
private XListView xlistview;
private List<NewsBean.DataBean> listAll = new ArrayList<>();
private List<NewsBean.DataBean> news = new ArrayList<>();
private NewsAdapter adapter;
private String key;
private int page;
private DButls dButls;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = View.inflate(getActivity(),R.layout.show_fragment,null);
xlistview =(XListView) view.findViewById(R.id.xlistview);
return view;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
     dButls = new DButls(getActivity());
    adapter = new NewsAdapter(getActivity(),news);
    xlistview.setAdapter(adapter);


     xlistview.setPullLoadEnable(true);
    xlistview.setXListViewListener(new XListView.IXListViewListener() {
        @Override
        public void onRefresh() {
          doHttp(page);
        }

        @Override
        public void onLoadMore() {
              page++;
              doHttp(page);
        }
    });
    Bundle bundle = getArguments();
    key = bundle.getString("key");

    doHttp(page);
}

private void doHttp(int page) {
   if(!NetworkUtils.isConnected(getActivity())){

// String data = getActivity().getSharedPreferences(“news”+key, 0).getString(“news”, “”);

      String data = dButls.qure();

       red(data);
       return;
   }

// String urlPath = “http://www.xieast.com/api/news/news.php?type=&page=1”;
String urlPath =“http://www.xieast.com/api/news/news.php?type="+key+"&page=”+page;
new HttpHelper(new HttpHelper.HttpListener() {
@Override
public void success(String data) {
//内存缓存
// SharedPreferences news = getActivity().getSharedPreferences(“news”+key, 0);
// news.edit().putString(“news”,data).commit();
// 封装到数据库
long insert = dButls.insert(data+key);
if (insert>0) {
Toast.makeText(getActivity(),“添加成功”,Toast.LENGTH_SHORT).show();
}
red(data);
}

        @Override
        public void fail() {

        }
    }).get(urlPath);

}

// 解析数据
private void red(String data){

Gson gson = new Gson();
NewsBean newsBean = gson.fromJson(data, NewsBean.class);
   news =  newsBean.getData();
           listAll.addAll(news);
           adapter.setList(listAll);
           xlistview.stopRefresh();
           xlistview.stopLoadMore();

}

}