接口解析XListView下拉刷新 上拉加载更多

一、思路顺序

	/**	上拉刷新没有截图，有这功能
	 * 1、布局页面四个，主页面 和三个自定义页面（自己需要的）控件根据自己需要添加
	 * 2、Java代码类包括 主类 工具类 JSONBean封装类 适配器类
	 * 3、用到的权限
	 *     
	 *     
	 *     
	 *     
	 * 4、Android Studio 导包 Glide Gson 外部包xlistview_library
	 * 外部包导入顺序 File——new——import module——找到文件——finish。
	 * 接着 File——Project Stucture——选择项目——Depen~~——点击加号选第三个——选择项目
	 */

二、Java代码（主页面）

public class Fragment01 extends Fragment {

@Override
private XListView listview;
private XAdpter adpter;
private List list;
private String url = "https://www.apiopen.top/meituApi?page=1";
    
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment01,container,false);
    listview = view.findViewById(R.id.xlist);
    listview.setPullLoadEnable(true);
    //设置上拉和下拉
    listview.setXListViewListener(new XListView.IXListViewListener(){
        @Override
        public void onRefresh() {
            HttpUtils.getAsyncTask(url, new HttpUtils.ClaaBackA() {
                @Override
                public void getData(String s) {
                    //解析
                    Gson gson = new Gson();
                    JsonBean jsonBean = gson.fromJson(s, JsonBean.class);
                     list = jsonBean.getData();
                    //适配器
                   adpter = new XAdpter(list, getActivity());
                    listview.setAdapter(adpter);
                    listview.stopRefresh();
                }
            });
        }

        @Override
        public void onLoadMore() {
            HttpUtils.getAsyncTask(url, new HttpUtils.ClaaBackA() {
                @Override
                public void getData(String s) {
                    //这个方法在主线程中
                    //解析
                    Gson gson = new Gson();
                    JsonBean bean = gson.fromJson(s, JsonBean.class);
                    //本人的JsonBean是用Android studio工具快捷键Alt+S 快速生成的 本文省略
                    List list2 = bean.getData();
                    list.addAll(list2);
                    adpter.notifyDataSetChanged();
                    listview.stopLoadMore();
                }
            });
        }
    });

    return view;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    //请求数据
    HttpUtils.getAsyncTask(url, new HttpUtils.ClaaBackA() {
        @Override
        public void getData(String s) {
            Gson gson = new Gson();
            JsonBean bean = gson.fromJson(s, JsonBean.class);
            list = bean.getData();
            //适配器
            adpter = new XAdpter(list,getActivity());
            listview.setAdapter(adpter);
        }
    });
}

}

三、工具类

public class HttpUtils {

//创建接口
public interface ClaaBackA{
    //写方法
    void getData(String s);
}
//封装异步
public static void getAsyncTask(String url, final ClaaBackA backA){
    new AsyncTask(){
        @Override
        protected String doInBackground(String... strings) {
            return httpGet(strings[0]);
        }
        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            backA.getData(s);
        }
    }.execute(url);
}

/**
 * @param strUrl 网络接口
 * @return :请求的 String 类型的数据
 * @author: Mr.Zhao
 * @data: 2019/1/2  16:24
 * @Description: 请求网络数据的方法
 */
public static String httpGet(String strUrl) {
    try {
        URL url = new URL(strUrl);
        //获取HttpURLConnection
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        //设置为get请求（大写
        connection.setRequestMethod("GET");
        //设置主机超时时间
        connection.setConnectTimeout(5000);
        //得到数据
        InputStream stream = connection.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
        //拼接数据
        StringBuilder builder = new StringBuilder();
        String strr="";
        while ((strr = reader.readLine())!=null){
            builder.append(strr);
        }
        //关闭连接
        connection.disconnect();
        //返回数据
        return builder.toString();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

}

四、适配器类

public class XAdpter extends BaseAdapter {

private List list;
private Context context;

public XAdpter(List list, Context context) {
    this.list = list;
    this.context = context;
}

@Override
public int getCount() {
    return list.size();
}

@Override
public Object getItem(int position) {
    return null;
}

@Override
public long getItemId(int position) {
    return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    int type = getItemViewType(position);
    switch (type){
        case 0:
            ViewHolder0 holder01 = null;
            if (convertView==null){
                convertView = View.inflate(context, R.layout.item01,null);
                holder01 = new ViewHolder0();
                holder01.textView0 = convertView.findViewById(R.id.textView01);
                convertView.setTag(holder01);
            }else{
                holder01 = (ViewHolder0) convertView.getTag();
            }
            JsonBean.DataBean bean0 = list.get(position);
            holder01.textView0.setText(bean0.getType());
            break;
        case 1:
            ViewHolder1 holder1 = null;
            if (convertView==null){
                convertView = View.inflate(context,R.layout.item02,null);
                holder1 = new ViewHolder1();
                holder1.textView1 = convertView.findViewById(R.id.textView1);
                holder1.imageView1 = convertView.findViewById(R.id.imageView1);
                convertView.setTag(holder1);
            }else{
                holder1= (ViewHolder1) convertView.getTag();
            }
            JsonBean.DataBean bean1 = list.get(position);
            holder1.textView1.setText(bean1.getType());
            //设置图片
            Glide.with(context).load("http://n.sinaimg.cn/sports/transform/237/w650h387/20190219/XUgA-htfpvza1481742.png").into(holder1.imageView1);
            break;
        case 2:
            ViewHolder2 holder2 = null;
            if (convertView == null){
                convertView = View.inflate(context,R.layout.item03,null);
                holder2 = new ViewHolder2();
                holder2.textView2 = convertView.findViewById(R.id.textView2);
                holder2.time2 = convertView.findViewById(R.id.textView22);
                holder2.imageView2 = convertView.findViewById(R.id.imageView2);
                convertView.setTag(holder2);
            }else{
                holder2= (ViewHolder2) convertView.getTag();
            }
            JsonBean.DataBean bean2 = list.get(position);
            holder2.textView2.setText(bean2.getType());
            holder2.time2.setText(bean2.getCreatedAt());
            //设置图片
             Glide.with(context).load("http://n.sinaimg.cn/sports/transform/237/w650h387/20190219/XUgA-htfpvza1481742.png").into(holder2.imageView2);
             break;
    }
    return convertView;
}

class ViewHolder0{
    TextView textView0;
}
class ViewHolder1{
    TextView textView1;
    ImageView imageView1;
}
class ViewHolder2{
    TextView textView2;
    ImageView imageView2;
    TextView time2;
}
@Override
public int getViewTypeCount() {
    return 3;
}

@Override
public int getItemViewType(int position) {
    return position % 3;
}

}