zoukankan html css js c++ java

PullToRefresh的使用

主界面↓

  1 package com.wangzhen.pulltorefresh;
  2 
  3 import java.util.ArrayList;
  4 import java.util.List;
  5 
  6 import com.handmark.pulltorefresh.library.PullToRefreshBase;
  7 import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
  8 import com.handmark.pulltorefresh.library.PullToRefreshListView;
  9 import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
 10 import com.lidroid.xutils.ViewUtils;
 11 import com.lidroid.xutils.view.annotation.ContentView;
 12 import com.lidroid.xutils.view.annotation.ViewInject;
 13 import com.wangzhen.adapter.MessageAdapter;
 14 import com.wangzhen.bean.NewsBean;
 15 import com.wangzhen.listener.HttpDataListener;
 16 import com.wangzhen.tasks.LoadNewsTask;
 17 
 18 import android.support.v7.app.ActionBarActivity;
 19 import android.text.format.DateUtils;
 20 import android.widget.ListView;
 21 import android.content.Context;
 22 import android.os.Bundle;
 23 
 24 @ContentView(R.layout.activity_main)
 25 public class MainActivity extends ActionBarActivity {
 26 
 27     @ViewInject(R.id.ListView_PullToRefresh)
 28     private PullToRefreshListView ListView_PullToRefresh;
 29 
 30     Context mContext;
 31     MessageAdapter adapter;
 32     private HttpDataListener mDataListener;
 33 
 34     @Override
 35     protected void onCreate(Bundle savedInstanceState) {
 36         super.onCreate(savedInstanceState);
 37         ViewUtils.inject(this);
 38         mContext = this;
 39 
 40         Setup();
 41         InitListener();
 42 
 43         List<NewsBean> list = new ArrayList<NewsBean>();
 44         for (int i = 0; i < 5; i++) {
 45             NewsBean bean = new NewsBean();
 46             bean.setNewsImageURL("");
 47             bean.setNewsTitle("标题" + (i + 1));
 48             bean.setNewsContent("内容" + (i + 1));
 49             list.add(bean);
 50         }
 51         adapter = new MessageAdapter(mContext, list);
 52         ListView_PullToRefresh.setAdapter(adapter);
 53 
 54         ListView_PullToRefresh
 55                 .setOnRefreshListener(new OnRefreshListener<ListView>() {
 56 
 57                     @Override
 58                     public void onRefresh(
 59                             PullToRefreshBase<ListView> refreshView) {
 60                         String time = DateUtils.formatDateTime(mContext,
 61                                 System.currentTimeMillis(),
 62                                 DateUtils.FORMAT_SHOW_TIME
 63                                         | DateUtils.FORMAT_SHOW_DATE
 64                                         | DateUtils.FORMAT_ABBREV_ALL);
 65 
 66                         // 下拉刷新
 67                         if (refreshView.isShownHeader()) {
 68                             // 设置刷新标签
 69                             ListView_PullToRefresh.getLoadingLayoutProxy()
 70                                     .setRefreshingLabel("正在刷新");
 71                             // 设置刷新标签
 72                             ListView_PullToRefresh.getLoadingLayoutProxy()
 73                                     .setPullLabel("下拉刷新");
 74                             // 设置刷新标签
 75                             ListView_PullToRefresh.getLoadingLayoutProxy()
 76                                     .setReleaseLabel("释放开始刷新");
 77                             // 设置上一次刷新的提示标签
 78                             refreshView.getLoadingLayoutProxy()
 79                                     .setLastUpdatedLabel("最后更新时间：" + time);
 80                         }
 81                         // 上拉加载
 82                         if (refreshView.isShownFooter()) {
 83                             // 设置刷新标签
 84                             ListView_PullToRefresh.getLoadingLayoutProxy()
 85                                     .setRefreshingLabel("正在加载");
 86                             // 设置刷新标签
 87                             ListView_PullToRefresh.getLoadingLayoutProxy()
 88                                     .setPullLabel("上拉加载更多");
 89                             // 设置刷新标签
 90                             ListView_PullToRefresh.getLoadingLayoutProxy()
 91                                     .setReleaseLabel("释放开始加载");
 92                             // 设置上一次刷新的提示标签
 93                             refreshView.getLoadingLayoutProxy()
 94                                     .setLastUpdatedLabel("最后加载时间：" + time);
 95                         }
 96                         new LoadNewsTask(ListView_PullToRefresh, mDataListener)
 97                                 .execute();
 98                     }
 99                 });
100     }
101 
102     /**
103      * 初始化监听器
104      */
105     private void InitListener() {
106         mDataListener = new HttpDataListener() {
107 
108             @Override
109             public void ParseResponse(List<NewsBean> list) {
110                 if (list == null) {
111                     return;
112                 }
113                 adapter.AddData(list);
114                 adapter.notifyDataSetChanged();
115             }
116         };
117     }
118 
119     /**
120      * 对下拉刷新和上拉加载进行设置
121      */
122     private void Setup() {
123         /**
124          * PullToRefresh刷新模式 
125          * Both：上拉刷新和下拉刷新都支持 
126          * DIABLED：禁用上拉下拉刷新
127          * PULL_FROM_START:仅支持下拉刷新 
128          * PULL_FROM_END:仅支持上拉加载
129          * MANUAL_REFRESH_ONLY:只允许手动触发
130          */
131         ListView_PullToRefresh.setMode(Mode.BOTH);
132     }
133 }

HTTP接口↓

 1 package com.wangzhen.listener;
 2 
 3 import java.util.List;
 4 
 5 import com.wangzhen.bean.NewsBean;
 6 
 7 /**
 8  * HTTP请求接口
 9  * @author Administrator
10  *
11  */
12 public interface HttpDataListener {
13 
14     /***
15      * 解析服务器返回结果
16      * 
17      * @param list
18      */
19     public abstract void ParseResponse(List<NewsBean> list);
20 }

异步加载类↓

 1 package com.wangzhen.tasks;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import com.handmark.pulltorefresh.library.PullToRefreshListView;
 7 import com.wangzhen.bean.NewsBean;
 8 import com.wangzhen.listener.HttpDataListener;
 9 
10 import android.os.AsyncTask;
11 
12 /**
13  * 异步加载新闻
14  * 
15  * @author Administrator
16  * 
17  */
18 public class LoadNewsTask extends AsyncTask<String, Void, List<NewsBean>> {
19 
20     PullToRefreshListView mListView;
21     HttpDataListener mListener;
22 
23     public LoadNewsTask(PullToRefreshListView listView,
24             HttpDataListener listener) {
25         mListView = listView;
26         mListener = listener;
27     }
28 
29     @Override
30     protected void onPostExecute(List<NewsBean> result) {
31         super.onPostExecute(result);
32         mListView.onRefreshComplete();
33         mListener.ParseResponse(result);
34     }
35 
36     @Override
37     protected List<NewsBean> doInBackground(String... params) {
38         try {
39             Thread.sleep(2000);
40         } catch (InterruptedException e) {
41             e.printStackTrace();
42         }
43         return GenerateData();
44     }
45 
46     /**
47      * 生成数据
48      * 
49      * @return
50      */
51     private List<NewsBean> GenerateData() {
52         List<NewsBean> list = new ArrayList<NewsBean>();
53         for (int i = 0; i < 5; i++) {
54             NewsBean bean = new NewsBean();
55             bean.setNewsImageURL("");
56             bean.setNewsTitle("添加标题" + (i + 1));
57             bean.setNewsContent("添加内容" + (i + 1));
58             list.add(bean);
59         }
60         return list;
61     }
62 
63 }

消息适配器↓

 1 package com.wangzhen.adapter;
 2 
 3 import java.util.List;
 4 
 5 import com.wangzhen.bean.NewsBean;
 6 import com.wangzhen.pulltorefresh.R;
 7 
 8 import android.content.Context;
 9 import android.view.LayoutInflater;
10 import android.view.View;
11 import android.view.ViewGroup;
12 import android.widget.BaseAdapter;
13 import android.widget.ImageView;
14 import android.widget.TextView;
15 
16 /**
17  * 新闻适配器
18  * 
19  * @author Administrator
20  * 
21  */
22 public class MessageAdapter extends BaseAdapter {
23 
24     Context mContext;
25     LayoutInflater mInflater;
26 
27     List<NewsBean> mData = null;
28 
29     public MessageAdapter(Context context, List<NewsBean> list) {
30         mContext = context;
31         mInflater = LayoutInflater.from(mContext);
32         mData = list;
33     }
34 
35     /**
36      * 增加数据源
37      * 
38      * @param data
39      */
40     public void AddData(List<NewsBean> list) {
41         for (NewsBean bean : list) {
42             this.mData.add(bean);
43         }
44     }
45 
46     @Override
47     public int getCount() {
48         // TODO Auto-generated method stub
49         return mData.size();
50     }
51 
52     @Override
53     public NewsBean getItem(int position) {
54         // TODO Auto-generated method stub
55         return mData.get(position);
56     }
57 
58     @Override
59     public long getItemId(int position) {
60         // TODO Auto-generated method stub
61         return position;
62     }
63 
64     @Override
65     public View getView(int position, View convertView, ViewGroup parent) {
66         ViewHolder holder;
67         if (convertView == null) {
68             holder = new ViewHolder();
69             convertView = mInflater.inflate(R.layout.item_layout, null);
70             holder.mImageView_Icon = (ImageView) convertView
71                     .findViewById(R.id.ImageView_Icon);
72             holder.mTextView_Title = (TextView) convertView
73                     .findViewById(R.id.TextView_Title);
74             holder.mTextView_Content = (TextView) convertView
75                     .findViewById(R.id.TextView_Content);
76             convertView.setTag(holder);
77 
78         } else {
79             holder = (ViewHolder) convertView.getTag();
80         }
81 
82         holder.mImageView_Icon.setImageResource(R.drawable.ic_launcher);
83         holder.mTextView_Title.setText(mData.get(position).getNewsTitle());
84         holder.mTextView_Content.setText(mData.get(position).getNewsContent());
85 
86         return convertView;
87     }
88 
89     class ViewHolder {
90         ImageView mImageView_Icon;
91         TextView mTextView_Title;
92         TextView mTextView_Content;
93     }
94 
95 }

实体类↓

 1 package com.wangzhen.bean;
 2 
 3 /**
 4  * 实体类
 5  * 
 6  * @author Administrator
 7  * 
 8  */
 9 public class NewsBean {
10 
11     private String NewsImageURL;
12     private String NewsTitle;
13     private String NewsContent;
14 
15     public String getNewsImageURL() {
16         return NewsImageURL;
17     }
18 
19     public void setNewsImageURL(String newsImageURL) {
20         NewsImageURL = newsImageURL;
21     }
22 
23     public String getNewsTitle() {
24         return NewsTitle;
25     }
26 
27     public void setNewsTitle(String newsTitle) {
28         NewsTitle = newsTitle;
29     }
30 
31     public String getNewsContent() {
32         return NewsContent;
33     }
34 
35     public void setNewsContent(String newsContent) {
36         NewsContent = newsContent;
37     }
38 
39 }

在PullToRefreshBase文件里要添加以下代码：

1 // 判别头部是否展示出来，如果展示出来代表下拉使得头部展示。true为下拉
2     public boolean isShownHeader() {
3         return getHeaderLayout().isShown();
4     }
5 
6     // 判别低部是否展示出来，如果展示出来代表上拉使得低部展示。true为上拉
7     public boolean isShownFooter() {
8         return getFooterLayout().isShown();
9     }

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原文地址：https://www.cnblogs.com/lavalike/p/4662961.html