ViewpageMaiActity

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:orientation="vertical"
    tools:context="com.example.weekend_03.MainActivity">

    <android.support.v4.view.ViewPager
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:id="@+id/vp"></android.support.v4.view.ViewPager>

    <com.bawei.jane.mxlistview.view.XListView
        android:id="@+id/xlv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/vp"></com.bawei.jane.mxlistview.view.XListView>
</RelativeLayout>

import android.os.AsyncTask;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import com.bawei.jane.mxlistview.view.XListView;
import com.example.weekend_03.utils.NetUtils;
import com.google.gson.Gson;

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

import java.net.URL;
import java.net.URLConnection;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private List<String> picUrl;
    private XListView xlv;
    private  int pageIndex=1;//第一页的数据
    private String urlpart="http://www.93.gov.cn/93app/data.do?channelId=0&startNum=";

    private String url =urlpart + pageIndex;

    private MyAdapter adapter;
    private List<Result.DataBean> data = new ArrayList<>();
    private int operType = 1;
    private ViewPager viewpage;

    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            int index = viewpage.getCurrentItem();
            index++;
            viewpage.setCurrentItem(index);
            sendEmptyMessageDelayed(0,500);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        picUrl = new ArrayList<>();
        xlv = findViewById(R.id.xlv);
        viewpage = findViewById(R.id.vp);

      if (NetUtils.isConn(this)){
          initData();
          MyTask myTask = new MyTask();
          myTask.execute(url);

          Toast.makeText(this,"有网络",Toast.LENGTH_SHORT).show();
          //设置适配器
          viewpage.setAdapter(new MyPagerAdapter(picUrl,this));
          //设置默认显示页面
          viewpage.setCurrentItem(picUrl.size()*10);
          //发消息
          handler.sendEmptyMessage(0);

      }else{
          NetUtils.openDg(this);
      }
        xlv.setPullRefreshEnable(true);
        xlv.setPullLoadEnable(true);
        xlv.setXListViewListener(new XListView.IXListViewListener() {
            @Override
            public void onRefresh() {

                pageIndex = 1;
                url =  urlpart+pageIndex;
                //重新赋值
                operType=1;
                MyTask myTask = new MyTask();
                myTask.execute(url);

            }

            @Override
            public void onLoadMore() {
//                页数增加
                pageIndex++;
                url=urlpart+pageIndex;
//          重新赋值
                operType =2;
                MyTask task = new MyTask();
                task.execute(url);

            }
        });

    }

    private void initData() {
        picUrl.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1513679323820&di=d33523977cd2b8c0e831513baa205965&imgtype=0&src=http%3A%2F%2Fc.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2Fa686c9177f3e67092b94a19231c79f3df9dc55c3.jpg");
        picUrl.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1513679323820&di=9d535a4011922065fc36e1d0cb3790fa&imgtype=0&src=http%3A%2F%2Fb.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2Fac4bd11373f082024ba9705241fbfbedab641ba7.jpg");
        picUrl.add("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1513679323820&di=7d77f15e8f8556eb72fee9b0962ef985&imgtype=0&src=http%3A%2F%2Ff.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2Fc75c10385343fbf25fb0ff46ba7eca8065388f33.jpg");
    }

    class MyTask extends AsyncTask <String,Void,String> {
        @Override
        protected String doInBackground(String... strings) {
            StringBuilder builder = new StringBuilder();
            try {
                URL  url = new URL(strings[0]);
                HttpURLConnection  c = (HttpURLConnection) url.openConnection();
                c.setRequestMethod("GET");
                c.setReadTimeout(5000);
                c.setConnectTimeout(5000);
                if (c.getResponseCode()==200){
                    InputStream inputStream = c.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                    String str;
                    while ((str=reader.readLine())!=null){
                        builder.append(str);
                    }
                    reader.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return builder.toString();
        }

        @Override
        protected void onPostExecute(String s) {
            Gson gson = new Gson();
            Result result = gson.fromJson(s, Result.class);

            if (operType==1){
                data.clear();
            }
            data.addAll(result.getData());
            setAdapter();
            //关闭头尾布局
            if (operType ==1){
                xlv.stopRefresh();
                Date date = new Date(System.currentTimeMillis());//获取当前时间
                SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//格式化时间
                String refreShTime = sf.format(date);
                xlv.setRefreshTime(refreShTime);//设置刷新时间
            }else {
                xlv.stopLoadMore();//关闭尾布局

            }

        }
    }
    public void setAdapter(){
        if (adapter==null){
            adapter = new MyAdapter(data,MainActivity.this);
            xlv.setAdapter(adapter);
        }else {
            adapter.notifyDataSetChanged();
        }
    }
}