二包Xlistview 上拉加载 下拉刷新 自己

//MaActivity  上拉下拉/////////////////////////////////

//复制三个类  一张图片   布局

package com.example.xlistview;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;
public class MainActivity extends AppCompatActivity implements XListView.IXListViewListener{

    private XListView xlv;
    private ArrayList<String> strings;
    private Madapter madapter;
  //主线程
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            madapter.notifyDataSetChanged();
            close();//暂停刷新
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        xlv=(XListView)findViewById(R.id.xlv);
        xlv.setPullLoadEnable(true);//允许加载
        xlv.setPullRefreshEnable(true);//允许刷新
        xlv.setXListViewListener(this);
        initData();
        madapter = new Madapter();
        xlv.setAdapter(madapter);
    }
      //添加listview原有的数据
    private void initData() {
         strings = new ArrayList<>();
        for (int i=0;i<5;i++){
            strings.add("张三"+i);
        }
    }

    //下拉刷新
    @Override
    public void onRefresh() {
         handler.postDelayed(
                 new Runnable() {
                     @Override
                     public void run() {
                         strings.add(0,"花开了");
                         handler.sendEmptyMessage(1);
                     }
                 },2000);
    }

    //上啦加载
    @Override
    public void onLoadMore() {
        handler.postDelayed(
                new Runnable() {
                    @Override
                    public void run() {
                        strings.add("鸟没了");
                        handler.sendEmptyMessage(1);
                    }
                },2000
        );
    }
  
    public void close(){
          xlv.stopLoadMore();
          xlv.stopRefresh();
          xlv.setRefreshTime("刚刚");
    }

//适配器
    class Madapter extends BaseAdapter{
        @Override
        public int getCount() {
            return strings.size();
        }

        @Override
        public Object getItem(int position) {
            return strings.get(position);
        }

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            TextView textView = new TextView(MainActivity.this);
            textView.setText(strings.get(position));
            textView.setTextSize(25);
            return textView;
        }
    }
}