xListView的使用

首先需要导入一个xlistview_library 导完记得和自己的项目关联一下
布局里面如何布局

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.qy.xlistview.XListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/xlistview"
        />

</android.support.constraint.ConstraintLayout>

写一个httpUtils，方便主页面调用

package com.ang.xlistview.http;

import android.os.AsyncTask;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * @Auther: Mr.Li
 * @Date: 2019/1/3 11:19:19
 * @Description:
 */
public class HttpUtils {

    public static void httpAsynTask(String strUrl,final CallBackString backString){
        new AsyncTask<String,Integer,String>(){

            @Override
            protected String doInBackground(String... strings) {
                return HttpGet(strings[0]);
            }
            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                //接口回调的方法
                backString.getData(s);
            }
        }.execute(strUrl);
    }
    //接口
    public interface CallBackString{
        void  getData(String s);
    }
    public static String HttpGet(String strUrl){
        try {
            //设置url
            URL url=new URL(strUrl);

            HttpURLConnection connection= (HttpURLConnection) url.openConnection();
            //设置get请求
            connection.setRequestMethod("GET");
            //设置从主机读取数据超时
            connection.setReadTimeout(5000);
            //设置连接主机超时时间
            connection.setConnectTimeout(5000);
            int code = connection.getResponseCode();
            if(code==200){
                //得到数据
                InputStream stream = connection.getInputStream();
                BufferedReader reader=new BufferedReader(new InputStreamReader(stream,"utf-8"));
                //拼接数据
                StringBuilder builder=new StringBuilder();
                String str="";
                while ((str=reader.readLine())!=null){
                    builder.append(str);
                }
                //返回数据
                return builder.toString();
            }
            //关闭连接
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

主页面的代码（Activity）

package com.ang.xlistview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Adapter;
import android.widget.ListAdapter;

import com.ang.xlistview.adapter.Myadapter;
import com.ang.xlistview.bean.Datas;
import com.ang.xlistview.bean.JsonBean;
import com.ang.xlistview.http.HttpUtils;
import com.google.gson.Gson;
import com.qy.xlistview.XListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private ArrayList<Datas> data;
    private Myadapter adapter;
    private XListView xListView;
    private String str = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找控件
        xListView = findViewById(R.id.xlistview);
        //启用（true）禁用（false）上拉加载
        xListView.setPullLoadEnable(true);
        //注册XListViewListener接口
        xListView.setXListViewListener(new XListView.IXListViewListener() {
            @Override
            public void onRefresh() {//下拉
                HttpUtils.httpAsynTask(str, new HttpUtils.CallBackString() {
                    @Override
                    public void getData(String s) {
                        Gson gson=new Gson();
                        JsonBean bean = gson.fromJson(s, JsonBean.class);
                        data=bean.getData();
                        adapter = new Myadapter(MainActivity.this, data);
                        xListView.setAdapter(adapter);
                        onLoad();
                    }
                });
            }

            @Override
            public void onLoadMore() {//上拉
                HttpUtils.httpAsynTask(str, new HttpUtils.CallBackString() {
                    @Override
                    public void getData(String s) {
                        Gson gson=new Gson();
                        JsonBean jsonBean = gson.fromJson(s, JsonBean.class);
                        ArrayList<Datas> list = jsonBean.getData();
                        data.addAll(list);
                        adapter.notifyDataSetChanged();
                        onLoad();
                    }
                });
            }
        });
        //数据
        HttpUtils.httpAsynTask(str, new HttpUtils.CallBackString() {
            @Override
            public void getData(String s) {
                //解析
                Gson gson=new Gson();
                JsonBean bean = gson.fromJson(s, JsonBean.class);
                data = bean.getData();
                adapter = new Myadapter(MainActivity.this, data);
                xListView.setAdapter(adapter);
            }
        });
    }
    private void onLoad() {
        //停止加载更多，重置头视图
        xListView .stopRefresh();
        //停止加载更多，重置脚视图
        xListView.stopLoadMore();
        //设置刷新时间
        xListView.setRefreshTime("刚刚刷新了");
    }
}

适配器我就不发了，就是一个简单的listview优化
给大家看下效果吧