XListview 上拉刷新

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添加权限   判断网络

<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"></uses-permission>
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XlistView  主要逻辑
package com.example.zhangt.elevent;import android.icu.text.SimpleDateFormat;import android.os.Build;import android.os.Handler;import android.os.Message;import android.support.annotation.RequiresApi;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import com.bwie.xlistviewlibrary.View.XListView;import com.example.zhangt.elevent.Bean.Result;import com.example.zhangt.elevent.Utils.ImageloaderUtil;import com.example.zhangt.elevent.Utils.MyTask;import com.google.gson.Gson;import com.nostra13.universalimageloader.core.ImageLoader;import java.sql.Date;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    Handler myHandler=new Handler(){        @RequiresApi(api = Build.VERSION_CODES.N)        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            if(msg.what==1){                //关闭底部视图                XListView.stopLoadMore();            }else{                Date date = new Date(System.currentTimeMillis());                SimpleDateFormat simpleDateFormat = new SimpleDateFormat("HH:mm");                String format = simpleDateFormat.format(date);                //设置时间                XListView.setRefreshTime(format);                //关闭头部视图                XListView.stopRefresh();            }        }    };
//////////////////////////////////////////////////////////////////////   private List<Result.DataBean> datas=new ArrayList<>();    private XListView XListView;    private int pageindex=1;    private myAdapter myAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        XListView = (XListView) findViewById(R.id.xlv);        XListView.setPullLoadEnable(true);        //支持加载更多        XListView.setPullLoadEnable(true);        XListView.setXListViewListener(new XListView.IXListViewListener() {            @Override            public void onRefresh() {//刷新回调的接口                //请求第一页的数据                MyTask myTask=new MyTask(new MyTask.Icallbacks() {                    @Override                    public void updateUiByjson(String jsonstr) {                        Gson gson=new Gson();                        Result result = gson.fromJson(jsonstr, Result.class);                        //添加到大集合对象中                        datas.addAll(result.getData());                        //设置适配器                        setAdapter();                        //延迟关闭头部视图                        myHandler.sendEmptyMessageDelayed(2,500);                    }                });                myTask.execute("http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=10&page=1");            }
/////////////////////////////////////////////////////////////////////////////
            public void onLoadMore() {//加载更多回调的接口方法                pageindex++;                Log.d("zzz","*************");                MyTask myTask=new MyTask(new MyTask.Icallbacks() {                    @Override                    public void updateUiByjson(String jsonstr) {                        Log.d("zzz",jsonstr);                        Gson gson=new Gson();                        Result result = gson.fromJson(jsonstr, Result.class);                        //添加到大集合对象中                        datas.addAll(result.getData());                        //设置适配器                        setAdapter();                        //关闭底部视图                        myHandler.sendEmptyMessageDelayed(1,500);                    }                });                myTask.execute("http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=10&page="+pageindex);            }        });        //初使化        requestNetData();    }
///////////////////////////////////////////////////////////////////
    private void requestNetData() {        MyTask myTask=new MyTask(new MyTask.Icallbacks() {            @Override            public void updateUiByjson(String jsonstr) {                Gson gson=new Gson();                Result result = gson.fromJson(jsonstr, Result.class);                //添加到大集合对象中                datas.addAll(result.getData());                //设置适配器                setAdapter();            }        });        myTask.execute("http://www.yulin520.com/a2a/impressApi/news/mergeList?pageSize=10&page=1");    }
///////////////////////////////////////////////////////////    public void setAdapter(){        if(myAdapter==null){            myAdapter=new myAdapter();            XListView.setAdapter(myAdapter);        }else{            myAdapter.notifyDataSetChanged();        }    }
/////////////////////////////////////////////////////////////    class  myAdapter extends BaseAdapter{        @Override        public int getCount() {            return datas.size();        }        @Override        public Object getItem(int position) {            return datas.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder holder;            if(convertView==null){                convertView=View.inflate(MainActivity.this,R.layout.xlv_one,null);                holder=new ViewHolder();                holder.tv=convertView.findViewById(R.id.text_title);                holder.im=convertView.findViewById(R.id.image_view);                convertView.setTag(holder);            }else{             holder=(ViewHolder) convertView.getTag();            }            holder.tv.setText(datas.get(position).getTitle());            ImageLoader.getInstance().displayImage(datas.get(position).getImg(),holder.im,ImageloaderUtil.getImageOptions());            return convertView;        }    }
//////////////////////////////////////////    class ViewHolder{        TextView tv;        ImageView im;    }
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    }

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