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

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