XListView

import android.os.AsyncTask;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import com.bawei.jane.mxlistview.view.XListView;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.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;import adapter.MyAdapter;import bean.Result;public class MainActivity extends AppCompatActivity {    private XListView xlv;    private  int pageIndex=1;//第一頁的數據    private String urlpart="http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=10&page=";    private String url =urlpart + pageIndex;    private MyAdapter adapter;    private List<Result.DataBean>data = new ArrayList<>();    private int operType = 1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //初始化控件        xlv = findViewById(R.id.xlv);        //對xlistview進行設置        xlv.setPullLoadEnable(true);//上拉加載更多        xlv.setPullRefreshEnable(true);//下拉刷新        //設置接口        xlv.setXListViewListener(new XListView.IXListViewListener() {            @Override            public void onRefresh() {//刷新                //刷新時，從新請求第一頁的數據                pageIndex = 1;                url = urlpart+pageIndex;                //從新賦值                operType = 1;                MyTask myTask = new MyTask();                myTask.execute(url);            }            @Override            public void onLoadMore() {//加載更多                //頁數增長                pageIndex++;                url = urlpart+pageIndex;                //從新賦值                operType =2;                MyTask task = new MyTask();                task.execute(url);            }        });     //進行網絡請求        MyTask myTask = new MyTask();        myTask.execute(url);    }      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 connection = (HttpURLConnection) url.openConnection();                  connection.setRequestMethod("GET");                  connection.setReadTimeout(5000);                  connection.setReadTimeout(5000);                  if (connection.getResponseCode()==200){                      InputStream inputStream = connection.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) {//表明刷新操做                  data.clear();//清空原有的集合數據              }              //增長新的數據集合到原來的集合對象中              data.addAll(result.getData());              setAdapter();              //關閉頭尾佈局              if (operType==1){                  xlv.stopRefresh();//關閉頭佈局                  Date date = new Date(System.currentTimeMillis());//獲取當前時間                  SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//格式化時間                  String refreShTime = sf.format(date);                  xlv.setRefreshTime(refreShTime);//設置刷新時間              }else{                  xlv.stopLoadMore();//關閉尾佈局              }              }          }          public void setAdapter(){        if (adapter ==null){            adapter = new MyAdapter(data,MainActivity.this);            xlv.setAdapter(adapter);        }else{            adapter.notifyDataSetChanged();        }          }      }