PullToRefresh +ListView 下拉刷新Demo1 (本地数据)

项目地址  https://github.com/chrisbanes/Android-PullToRefresh     

通过File>New>Import Module  导入项目

MainActivity

package com.example.administrator.pulltorefreshdemo;


import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
import com.handmark.pulltorefresh.library.ILoadingLayout;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private PullToRefreshListView refresh_lv; //声明对象
    private List<Music> list;    //声明箱子
    private DataAdapter adapter;  //声明适配器   为了更新声明在头部

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);    //绑定布局文件

        refresh_lv = (PullToRefreshListView) findViewById(R.id.main_pull_refresh_lv);  //初始化listview
        list = new ArrayList<>();  //把声明的箱子实例化
//-----------------------------------------------------------------------------------------------------------------
        //设置可上拉刷新和下拉刷新
        refresh_lv.setMode(PullToRefreshBase.Mode.BOTH);

        //设置刷新时显示的文本
        ILoadingLayout startLayout = refresh_lv.getLoadingLayoutProxy(true,false);
        startLayout.setPullLabel("正在下拉刷新...");
        startLayout.setRefreshingLabel("正在玩命加载中...");
        startLayout.setReleaseLabel("放开以刷新");


        ILoadingLayout endLayout = refresh_lv.getLoadingLayoutProxy(false,true);
        endLayout.setPullLabel("正在上拉刷新...");
        endLayout.setRefreshingLabel("正在玩命加载中...");
        endLayout.setReleaseLabel("放开以刷新");


//--------------------监听下拉上拉-------------------------------------------------------------
        refresh_lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {     //实现这个方法之前创建一个异步类LoadDataAsyncTask
                new LoadDataAsyncTask(MainActivity.this).execute();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                new LoadDataAsyncTask(MainActivity.this).execute();
            }
        });
        //--------------------监听结束-------------------------------------------------------------



        loadData();

        adapter = new DataAdapter(this,list);     //给listview 添加之前把适配器adapter初始化
        refresh_lv.setAdapter(adapter);           //给listview 添加适配器adapter


    }
    //----------------------------模拟数据绑定------------------------------------------------------------
    private int count = 1;
    private void loadData(){
        for (int i = 0; i < 4; i++) {
            list.add(new Music("歌曲"+count,"歌手"+count));
            count++;
        }
    }

    /**
     * 异步下载任务
     */
    //----------------------------异步下载任务类------------------------------------------------------------
    private static class LoadDataAsyncTask extends AsyncTask<Void,Void,String>{

        private MainActivity mainActivity;           //通过构造方法把activity传进去

        public LoadDataAsyncTask(MainActivity mainActivity) {//通过构造方法把activity传进去
            this.mainActivity = mainActivity;//通过构造方法把activity传进去
        }

        @Override
        protected String doInBackground(Void... params) {
            try {
                Thread.sleep(2000);
                mainActivity.loadData();
                return "seccess";
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return null;
        }

        /**
         * 完成时的方法
         */
        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            if (s.equals("seccess")){   //如果数据下载完成  //数据显示在列表
                mainActivity.adapter.notifyDataSetChanged();  //通知
                mainActivity.refresh_lv.onRefreshComplete();//刷新完成  合上
            }
        }
    }
    //----------------------------异步下载任务类结束------------------------------------------------------------


}

Music  getter and  setter  ,有参无参构造函数加起来

package com.example.administrator.pulltorefreshdemo;

/**
 * Created by Administrator on 2018/1/6.
 */

public class Music {
    private String title;
    private String singer;

    public Music() {
    }

    public Music(String title, String singer) {
        this.title = title;
        this.singer = singer;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getSinger() {
        return singer;
    }

    public void setSinger(String singer) {
        this.singer = singer;
    }
}

DataAdapter

package com.example.administrator.pulltorefreshdemo;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

/**
 * Created by Administrator on 2018/1/6.
 */

public  class DataAdapter extends BaseAdapter{

    private Context context;
    private List<Music> list;

    public DataAdapter(Context context, List<Music> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public int getCount() {
        if (list != null){
            return list.size();
        }
        return 0;
    }

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder vh;
        if (convertView == null){
            convertView = LayoutInflater.from(context).inflate(R.layout.list_item,parent,false);
            vh = new ViewHolder();
            vh.tv_title = (TextView) convertView.findViewById(R.id.item_title);
            vh.tv_singer = (TextView) convertView.findViewById(R.id.item_singer);
            convertView.setTag(vh);
        }else{
            vh = (ViewHolder) convertView.getTag();
        }
        Music music = (Music) getItem(position);
        vh.tv_title.setText(music.getTitle());
        vh.tv_singer.setText(music.getSinger());
        return convertView;
    }

    class ViewHolder{
        TextView tv_title;
        TextView tv_singer;
    }
}

activity_main

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/main_pull_refresh_lv"
        app:ptrAnimationStyle="flip"
        app:ptrHeaderBackground="@android:color/transparent"
        app:ptrHeaderTextColor="#919191"/>

</RelativeLayout>

list_item

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/item_title"
        android:text="歌曲1"
        android:textSize="20sp"
        android:layout_alignParentLeft="true"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/item_singer"
        android:textSize="20sp"
        android:text="歌手1"
        android:layout_alignParentRight="true"/>


</RelativeLayout>