下拉刷新--第三方开源--PullToRefresh

1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2     xmlns:tools="http://schemas.android.com/tools"
3     android:layout_width="match_parent"
4     android:layout_height="match_parent"
5     tools:context="com.zzw.testpulltorefresh.MainActivity" >
6
7     <com.handmark.pulltorefresh.library.PullToRefreshListView
8         android:id="@+id/listView"
9         android:layout_width="match_parent"
10         android:layout_height="match_parent" />
11
12 </RelativeLayout>

1 package com.zzw.testpulltorefresh;
2
3 import java.util.ArrayList;
4 import java.util.Date;
5
6 import com.handmark.pulltorefresh.library.PullToRefreshBase;
7 import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
8 import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
9 import com.handmark.pulltorefresh.library.PullToRefreshListView;
10
11 import android.app.Activity;
12 import android.os.AsyncTask;
13 import android.os.Bundle;
14 import android.os.SystemClock;
15 import android.widget.Adapter;
16 import android.widget.ArrayAdapter;
17 import android.widget.ListView;
18 import android.widget.TextView;
19 import android.widget.Toast;
20
21 public class MainActivity extends Activity {
22
23     private PullToRefreshListView listView;
24     private ArrayList<String> data;
25     private ArrayAdapter adapter;
26     private int count = 0;
27
28     @Override
29     protected void onCreate(Bundle savedInstanceState) {
30         super.onCreate(savedInstanceState);
31         setContentView(R.layout.activity_main);
32
33         data = new ArrayList<String>();
34
35         listView = (PullToRefreshListView) findViewById(R.id.listView);
36         // 设置向下滑动时刷新
37         listView.setMode(Mode.PULL_FROM_START);
38         // 设置监听
39         listView.setOnRefreshListener(new OnRefreshListener<ListView>() {
40
41             @Override
42             public void onRefresh(PullToRefreshBase<ListView> refreshView) {
43                 // 在这完成业务逻辑
44                 new MyAsyncTask().execute();
45             }
46         });
47
48         adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, data);
49         listView.setAdapter(adapter);
50
51         // 设置如果数据为空的时候显示什么
52         TextView textView = new TextView(this);
53         textView.setText("请下拉刷新");
54         listView.setEmptyView(textView);
55     }
56
57     private class MyAsyncTask extends AsyncTask {
58
59         @Override
60         protected void onPreExecute() {
61             // 开始刷新
62             listView.setRefreshing();
63         }
64
65         @Override
66         protected Object doInBackground(Object... params) {
67             // 假设耗时时间为3秒
68             SystemClock.sleep(3000);
69             return count++;
70         }
71
72         @Override
73         protected void onPostExecute(Object result) {
74
75             data.add(0, result + "");
76             adapter.notifyDataSetChanged();
77
78             // 设置标签
79             listView.setLastUpdatedLabel("最后更新新的时间：" + new Date());
80
81             // 刷新完成
82             listView.onRefreshComplete();
83             Toast.makeText(getApplicationContext(), "加载成功", 0).show();
84         }
85     }
86
87 }