SimpleAdapter

正想着该如何实现左图片右文字。原来SimpleAdapter可以胜任这个工作。

First, if a SimpleAdapter.ViewBinder is available, setViewValue(android.view.View, Object, String) is invoked. If the returned value is true, binding has occurred. If the returned value is false,

the following views are then tried in order:

A view that implements Checkable (e.g. CheckBox). The expected bind value is a boolean.
TextView. The expected bind value is a string and setViewText(TextView, String) is invoked.
ImageView. The expected bind value is a resource id or a string and setViewImage(ImageView, int) or setViewImage(ImageView, String) is invoked.

我不用SimpleAdapter.ViewBinder接口实现。而是用列表显示的三个规则。

 1 public class MainActivity extends ListActivity{
 2 
 3     @Override
 4     protected void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6 
 7         
 8          SimpleAdapter simpleAdapter = new SimpleAdapter(this, getSimpleData(),
 9                     R.layout.image_text_2,
10                     new String[] { "img", "name" },
11                     new int[] { R.id.img,R.id.name});
12          
13          this.setListAdapter(simpleAdapter);
14     }
15 
16     private List<Map<String, Object>> getSimpleData() {
17         List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
18         Map<String, Object> item = new HashMap<String, Object>();
19         item.put("img",R.drawable.ic_launcher);
20         item.put("name", "刘备");
21         data.add(item);
22    
23         item = new HashMap<String, Object>();
24         item.put("img",R.drawable.ic_launcher);
25         item.put("name", "关羽");
26         data.add(item);
27    
28         item = new HashMap<String, Object>();
29         item.put("img",R.drawable.ic_launcher);
30         item.put("name", "张飞");
31         data.add(item);
32    
33         item = new HashMap<String, Object>();
34         item.put("img",R.drawable.ic_launcher);
35         item.put("name", "赵云");
36         data.add(item);
37    
38         return data;
39     }
40 }

2.布局文件image_text_2.xml如下：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6     
 7     <ImageView  android:id="@+id/img"
 8          android:layout_width="wrap_content"
 9          android:layout_height="wrap_content"/>
10     
11     <TextView  android:id="@+id/name"
12          android:layout_width="wrap_content"
13          android:layout_height="wrap_content"
14          android:layout_toRightOf="@id/img"/>
15 </RelativeLayout>

3.效果如下：

4.网上找的ViewBinder实现，以备不时之需。

 1 SimpleAdapter notes = new SimpleAdapter(this, list,
 2         R.layout.meinungen_list_row, PARAM, new int[] { R.id.icon, R.id.name, R.id.content });
 3 notes.setViewBinder(new MyViewBinder());
 4 setListAdapter(notes);
 5 
 6 public class MyViewBinder implements ViewBinder {
 7     @Override
 8     public boolean setViewValue(View view, Object data,String textRepresentation) {        
 9         if( (view instanceof ImageView) & (data instanceof Bitmap) ) {
10             ImageView iv = (ImageView) view;
11             Bitmap bm = (Bitmap) data;
12             iv.setImageBitmap(bm);
13             return true;
14         }
15     return false;
16 }