android下拉刷新

下拉刷新效果实现图：

下拉刷新代码实现，xml部分代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<com.handmark.pulltorefresh.library.PullToRefreshListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/ptrlv_reflsh"
    >
</com.handmark.pulltorefresh.library.PullToRefreshListView>

</LinearLayout>


java部分代码：







package com.example.kongjian_06;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Administrator on 2017/6/11.
 */

public class PullToRefresh extends AppCompatActivity {

    private PullToRefreshListView ptrlv;
    private List<String> list;
    private ArrayAdapter aa;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pulltorefresh);
        ptrlv = (PullToRefreshListView) findViewById(R.id.ptrlv_reflsh);//获取PullToRefreshListView
        list = new ArrayList<>();//new一个集合
        for (int i = 0; i <10 ; i++) {
            list.add("haha"+i);//将数据填入集合中
        }
        aa = new ArrayAdapter(this,android.R.layout.simple_list_item_1,list);//new一个适配器
        ptrlv.setAdapter(aa);//给ptrlv设置适配器
        ptrlv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                new MyTask().execute();//newMyTask并执行
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {

            }
        });
    }

    class MyTask extends AsyncTask{

        @Override
        protected Object doInBackground(Object[] params) {
            for (int i = 0; i <3 ; i++) {
                list.add(0,"huohuo"+i);//将数据添加到数据最前面
            }
            return null;
        }

        @Override
        protected void onPostExecute(Object o) {
            super.onPostExecute(o);
            ptrlv.onRefreshComplete();
            aa.notifyDataSetChanged();//通知适配器发生改变
        }
    }

}