6ListView2

本例項介紹一種更為高階的列表效果：


這裡我們可以設定每一個列表item的佈局檔案，通過這個佈局檔案我們可以定義每個item的樣式從而使得item的佈局更加的美觀


要想達到以上的目的，我們就要使用另一個adapter，這個adapter就是SimpleAdapter


這裡我們簡單的介紹一下simpleAdapter的的建構函式




public SimpleAdapter (Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to)


Since: API Level 1
Constructor
Parameters


context The context where the View associated with this SimpleAdapter is running
data A List of Maps. Each entry in the List corresponds to one row in the list. The Maps contain the data for each row, and should include all the entries specified in "from"
resource Resource identifier of a view layout that defines the views for this list item. The layout file should include at least those named views defined in "to"
from A list of column names that will be added to the Map associated with each item.
to The views that should display column in the "from" parameter. These should all be TextViews. The first N views in this list are given the values of the first N columns in the from parameter.


第一個引數是context引數，第二個引數是資料引數，這個引數的型別是一個裝有多個map物件的List物件。
第三個引數是佈局的xml檔案的id
第四個引數是map中的列名稱
第五個引數是列名稱所分別對應的佈局中的資源id


以下是程式碼：
public class ListView extends ListActivity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);


SimpleAdapter adapter = new SimpleAdapter(this,getData(),R.layout.main,
 new String[]{"title","info","img"},
 new int[]{R.id.title,R.id.info,R.id.img});


setListAdapter(adapter);
}
private List<Map<String, Object>> getData() {
       List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
       Map<String, Object> map = new HashMap<String, Object>();
       map.put("title", "G1");
       map.put("info", "google 1");
       map.put("img", R.drawable.i1);
       list.add(map);
       
       map = new HashMap<String, Object>();
       map.put("title", "G2");
       map.put("info", "google 2");
       map.put("img", R.drawable.i2);
       list.add(map);
       
       map = new HashMap<String, Object>();
       map.put("title", "G3");
       map.put("info", "google 3");
       map.put("img", R.drawable.i3);
       list.add(map); 
       
       return list;
   }
佈局檔案如下所示：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
<ImageView android:id="@+id/img"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_margin="5px"/>
<LinearLayout android:orientation="vertical"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        
<TextView android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#FFFFFFFF"
        android:textSize="22px" />


<TextView android:id="@+id/info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#FFFFFFFF"
        android:textSize="13px" />
    </LinearLayout>
</LinearLayout>