ListView小用法

列表标题：照片名，编号，照片得分

根据ArrayList<Photo> photos 依次添加列表项。关键点设置为adapter的六个参数，并且用getData()方法得到 List<HashMap<Object, Object>>类型的对象

 1 package cqu.wm;
 2 
 3 import java.io.File;
 4 import java.util.ArrayList;
 5 import java.util.HashMap;
 6 import java.util.List;
 7 import tool.Photo;
 8 import tool.PhotoService;
 9 import android.app.ListActivity;
10 import android.os.Bundle;
11 import android.os.Environment;
12 import android.widget.SimpleAdapter;
13 
14 public class myListActivity extends ListActivity {
15 
16     /** Called when the activity is first created. */
17     public static final String TAG = "dbtest";
18     PhotoService photoservice = null;
19     ArrayList<Photo> photos = new ArrayList<Photo>();
20 
21     @Override
22     public void onCreate(Bundle savedInstanceState) {
23 
24         super.onCreate(savedInstanceState);
25 
26         photoservice = new PhotoService(this);
27         initiallize();
28         SimpleAdapter adapter = new SimpleAdapter(this, getData(),
29                 R.layout.listview, new String[] { "id", "name", "score" },
30                 new int[] { R.id.idview, R.id.nameview, R.id.scoreview });
31         setListAdapter(adapter);
32 
33     }
34 
35     private void initiallize() {
36         File[] dir = new File(Environment.getExternalStorageDirectory()
37                 .getPath() + "/DCIM").listFiles();
38         File[] photolist = null;
39         for (int i = 0; i < dir.length; i++) {
40             if (dir[i].getName().startsWith("100")) {
41                 photolist = dir[i].listFiles();
42                 break;
43             }
44         }
45         for (File file : photolist) {
46             Photo photo = new Photo(file.getName(), 100);
47             photos.add(photo);
48         }
49          photoservice.saveAll(photos);
50          photoservice.find("ali_washing.jpg");
51          photoservice.save(new Photo(1, "ali_help.jpg", 100));
52          photoservice.update(new Photo(1, "ali_help.jpg", 20));
53          photoservice.delete(photoservice.find("ali_help.jpg"));
54          photoservice.clear();
55 
56     }
57 
58     private List<HashMap<String, String>> getData() {
59 
60         List<HashMap<String, String>> data = new ArrayList<HashMap<String, String>>();
61         HashMap<String, String> title = new HashMap<String, String>();
62         title.put("id", "编号");
63         title.put("name", "照片名");
64         title.put("score", "照片得分");
65         data.add(title);
66         for (Photo photo : photos) {
67             HashMap<String, String> map = new HashMap<String, String>();
68             map.put("id", String.valueOf(photo.getId()));
69             map.put("name", photo.getName());
70             map.put("score", String.valueOf(photo.getScore()));
71             data.add(map);
72         }
73         return data;
74     }
75 }



posted @ 2011-12-10 21:22  captain_meng  阅读(224)  评论(0)  编辑  收藏  举报