Android控件之ListView探究一

在android开发中ListView是比较常用的组件，它以列表的形式展示具体内容，并且能够根据数据的长度自适应显示。

main.xml布局文件

  
    

   
     <?
   
     xml version
   
     =
   
     "
   
     1.0
   
     "
   
      encoding
   
     =
   
     "
   
     utf-8
   
     "
   
     ?>
   
     

   
     <
   
     LinearLayout android:id
   
     =
   
     "
   
     @+id/LinearLayout01
   
     "
   
     
 android:layout_width
   
     =
   
     "
   
     fill_parent
   
     "
   
      android:layout_height
   
     =
   
     "
   
     fill_parent
   
     "
   
     
 xmlns:android
   
     =
   
     "
   
     http://schemas.android.com/apk/res/android
   
     "
   
     >
   
     
 
   
     <
   
     ListView android:layout_width
   
     =
   
     "
   
     wrap_content
   
     "
   
     
 android:layout_height
   
     =
   
     "
   
     wrap_content
   
     "
   
      
 android:id
   
     =
   
     "
   
     @+id/MyListView
   
     "
   
     >
   
     
 
   
     </
   
     ListView
   
     >
   
     

   
     </
   
     LinearLayout
   
     >
  
    

my_listitem.xml布局文件

  
    

   
     <?
   
     xml version
   
     =
   
     "
   
     1.0
   
     "
   
      encoding
   
     =
   
     "
   
     utf-8
   
     "
   
     ?>
   
     

   
     <
   
     LinearLayout android:layout_width
   
     =
   
     "
   
     fill_parent
   
     "
   
     
 xmlns:android
   
     =
   
     "
   
     http://schemas.android.com/apk/res/android
   
     "
   
     
 android:orientation
   
     =
   
     "
   
     vertical
   
     "
   
      
 android:layout_height
   
     =
   
     "
   
     wrap_content
   
     "
   
     
 android:id
   
     =
   
     "
   
     @+id/myListItem
   
     "
   
      
 android:paddingBottom
   
     =
   
     "
   
     3dip
   
     "
   
     
 android:paddingLeft
   
     =
   
     "
   
     10dip
   
     "
   
     >
   
     
 
   
     <
   
     TextView android:layout_height
   
     =
   
     "
   
     wrap_content
   
     "
   
     
 android:layout_width
   
     =
   
     "
   
     fill_parent
   
     "
   
      
 android:id
   
     =
   
     "
   
     @+id/itemTitle
   
     "
   
     
 android:textSize
   
     =
   
     "
   
     20dip
   
     "
   
     >
   
     
 
   
     </
   
     TextView
   
     >
   
     
 
   
     <
   
     TextView android:layout_height
   
     =
   
     "
   
     wrap_content
   
     "
   
     
 android:layout_width
   
     =
   
     "
   
     fill_parent
   
     "
   
      
 android:id
   
     =
   
     "
   
     @+id/itemText
   
     "
   
     >
   
     
 
   
     </
   
     TextView
   
     >
   
     

   
     </
   
     LinearLayout
   
     >
  
    

LsActivity类

  
    

   
     package
   
      com.ljq.ls;


   
     import
   
      java.util.ArrayList;

   
     import
   
      java.util.HashMap;

   
     import
   
      java.util.List;


   
     import
   
      android.app.Activity;

   
     import
   
      android.os.Bundle;

   
     import
   
      android.widget.ListView;

   
     import
   
      android.widget.SimpleAdapter;


   
     public
   
      
   
     class
   
      LsActivity 
   
     extends
   
      Activity {
 
   
     private
   
      ListView list 
   
     =
   
      
   
     null
   
     ;
 
 
   
     public
   
      
   
     void
   
      onCreate(Bundle savedInstanceState) {
 
   
     super
   
     .onCreate(savedInstanceState);
 setContentView(R.layout.main);
 list 
   
     =
   
      (ListView) findViewById(R.id.MyListView);
 
 
   
     //
   
     组织数据源
   
     

   
      List
   
     <
   
     HashMap
   
     <
   
     String, String
   
     >>
   
      mylist 
   
     =
   
      
   
     new
   
      ArrayList
   
     <
   
     HashMap
   
     <
   
     String, String
   
     >>
   
     ();
 
   
     for
   
     (
   
     int
   
      i
   
     =
   
     0
   
     ;i
   
     <
   
     10
   
     ;i
   
     ++
   
     ) {
 HashMap
   
     <
   
     String, String
   
     >
   
      map 
   
     =
   
      
   
     new
   
      HashMap
   
     <
   
     String, String
   
     >
   
     ();
 map.put(
   
     "
   
     itemTitle
   
     "
   
     , 
   
     "
   
     This is Title
   
     "
   
     );
 map.put(
   
     "
   
     itemText
   
     "
   
     , 
   
     "
   
     This is text
   
     "
   
     );
 mylist.add(map);
 }
 
 
   
     //
   
     配置适配器
   
     

   
      SimpleAdapter adapter 
   
     =
   
      
   
     new
   
      SimpleAdapter(
   
     this
   
     , 
 mylist,
   
     //
   
     数据源 
   
     

   
      R.layout.my_listitem,
   
     //
   
     显示布局
   
     

   
      
   
     new
   
      String[] {
   
     "
   
     itemTitle
   
     "
   
     , 
   
     "
   
     itemText
   
     "
   
     }, 
   
     //
   
     数据源的属性字段
   
     

   
      
   
     new
   
      
   
     int
   
     [] {R.id.itemTitle,R.id.itemText}); 
   
     //
   
     布局里的控件id
 
   
     //
   
     添加并且显示
   
     

   
      list.setAdapter(adapter);
 }
}
  
    

运行结果