Android开源库——PullToRefresh 安卓开发

【Android开源库——PullToRefresh】类似SlidingMenu也是一个开源组件，集成的方式也类似，不赘述，可以参考
https://blog.csdn.net/nishigesb123/article/details/90261849
PullToRefresh 概述使用 PullToRefresh 可以实现对多种控件进行下拉刷新、上拉加载操作，还可以实现自定义刷新和加载部分视图等操作。
项目地址：https://github.com/chrisbanes/Android-PullToRefresh

Pull To Refresh Views for Android

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This project aims to provide a reusable Pull to Refresh widget for Android. It was originally based on Johan Nilsson's library(mainly for graphics, strings and animations), but these have been replaced since.
Features

Supports both Pulling Down from the top, and Pulling Up from the bottom (or even both).

Animated Scrolling for all devices.

Over Scroll supports for devices on Android v2.3+.

Currently works with:

ListView

ExpandableListView

GridView

WebView

ScrollView

HorizontalScrollView

ViewPager

Integrated End of List Listener for use of detecting when the user has scrolled to the bottom.

Maven Support.

Indicators to show the user when a Pull-to-Refresh is available.

Support for ListFragment!

Lots of Customisation options!

Repository at https://github.com/chrisbanes/Android-PullToRefresh.

使用PullToRefresh实现列表刷新添加布局文件
首先有一条添加“命名空间”的语句需要设置一下，图示处找个位置加进去就好~

xmlns:ptr="http://schemas.android.com/apk/res-auto"

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然后是组件

ptrDrawable表示图片资源（代码中使用了library里的一个默认资源，大概是一个下拉箭头的样子）
ptrAnimationStyle为动画效果，有两种，flip表示上下，还有一个是rotate表示旋转
剩下两组ptr开头的参数分别是背景和文本颜色

列表
一般情况下，下拉刷新的操作肯定是对列表而言的，我们这里也不例外。所以既然是对列表而言，所以我们还得先准备一个列表。
首先是列表数据对象

package com.example.a5_16pulltorefresh; public class Music { //标题 private String title; //歌手 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; } }

列表项布局文件

完整代码

package com.example.a5_16pulltorefresh; import android.content.Context; import android.os.AsyncTask; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import com.handmark.pulltorefresh.library.ILoadingLayout; import com.handmark.pulltorefresh.library.PullToRefreshBase; import com.handmark.pulltorefresh.library.PullToRefreshListView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { private PullToRefreshListView lv; //音乐列表 private ArrayList musics = new ArrayList<>(); private DataAdapter dataAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv = findViewById(R.id.pull_to_refresh_listView); //不带2的只用实现一个刷新方法 //lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener() { //@Override //public void onRefresh(PullToRefreshBase refreshView) { // //} //}); //带2的是上下刷新可以单独实现方法 lv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2() { @Override public void onPullDownToRefresh(PullToRefreshBase refreshView) { new LoadDataAsyncTask(MainActivity.this).execute(); }@Override public void onPullUpToRefresh(PullToRefreshBase refreshView) { new LoadDataAsyncTask(MainActivity.this).execute(); } }); //设置模式——BOTH表示上下都可以 lv.setMode(PullToRefreshBase.Mode.BOTH); //设置刷新时显示的文本 //下拉 ILoadingLayout startLayout = lv.getLoadingLayoutProxy(true, false); startLayout.setPullLabel("正在下拉刷新..."); startLayout.setRefreshingLabel("正在玩命加载中..."); startLayout.setReleaseLabel("放开刷新..."); //上拉 ILoadingLayout endLayout = lv.getLoadingLayoutProxy(false, true); endLayout.setPullLabel("正在上拉刷新..."); endLayout.setRefreshingLabel("正在玩命加载中..."); endLayout.setReleaseLabel("放开刷新..."); //调用一次 loadData(); dataAdapter = new DataAdapter(this, musics); lv.setAdapter(dataAdapter); }//异步类 static class LoadDataAsyncTask extends AsyncTask { private MainActivity mainActivity; //静态方法，需要传... public LoadDataAsyncTask(MainActivity mainActivity) { this.mainActivity = mainActivity; }@Override protected String doInBackground(Void... voids) { try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } mainActivity.loadData(); return "success"; }//完成数据的话... @Override protected void onPostExecute(String s) { super.onPostExecute(s); if ("success".equals(s)) { mainActivity.dataAdapter.notifyDataSetChanged(); //通知数据集发生改变 mainActivity.lv.onRefreshComplete(); //表示刷新完成 } } }//模拟一组数据 private int count = 1; private void loadData() { for (int i = 0; i < 10; i++) { musics.add(new Music("歌曲-" + count, "歌手-" + count)); count++; } }static class DataAdapter extends BaseAdapter { private Context ctx; private ArrayList musics; //构造器传上下文 public DataAdapter(Context context, ArrayList musics) { this.ctx = context; this.musics = musics; }@Override public int getCount() { return musics.size(); }@Override public Object getItem(int position) { return musics.get(position); }@Override public long getItemId(int position) { return position; }@Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder vh; //码一下 if (convertView == null) { convertView = LayoutInflater.from(ctx).inflate(R.layout.list_item, null); vh = new ViewHolder(); vh.tv_title = convertView.findViewById(R.id.title); vh.tv_singer = convertView.findViewById(R.id.singer); convertView.setTag(vh); } vh = (ViewHolder) convertView.getTag(); Music m = musics.get(position); vh.tv_title.setText(m.getTitle()); vh.tv_singer.setText(m.getSinger()); return convertView; }static class ViewHolder { TextView tv_title; TextView tv_singer; } }}

测试效果