ListView和数据绑定

ListView和数据绑定

 

 

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。

 

 

下面是具体的例子：

 

 ListView例子效果图

 

 

main_list_view.xml配置

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<ListView
    android:id="@+id/main_list_view_listview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    />
</LinearLayout>

 

main_list_view_item.xml配置

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@+id/RelativeLayout_Item"
	android:layout_width="fill_parent" android:layout_height="wrap_content"
	android:paddingBottom="5dip"
	>
	<ImageView 
		android:id="@+id/main_list_view_item_item_image"
		android:layout_centerHorizontal="true" 
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		/>
	<TextView 
		android:id="@+id/main_list_view_item_item_text"
		android:layout_centerHorizontal="true" 
		android:layout_width="wrap_content"
		android:layout_height="wrap_content" 
		android:textSize="20px"
		android:layout_gravity="center"
		/>
</LinearLayout>

 

Activity代码

 

    //定义选项菜单
    private String[] allOptionsMenuTexts = {"删除","保存","帮助","添加","详细","发送","电话","照相"};
    private int[] allOptionsMenuOrders = {5,2,6,1,4,3,7,8};
    private int[] allOptionsMenuIds = {Menu.FIRST+1,Menu.FIRST+2,Menu.FIRST+3,Menu.FIRST+4,Menu.FIRST+5,Menu.FIRST+6,Menu.FIRST+7,Menu.FIRST+8};
    private int[] allOptionsMenuIcons = {
    		android.R.drawable.ic_menu_delete,
    		android.R.drawable.ic_menu_edit,
    		android.R.drawable.ic_menu_help,
    		android.R.drawable.ic_menu_add,
    		android.R.drawable.ic_menu_info_details,
    		android.R.drawable.ic_menu_send,
    		android.R.drawable.ic_menu_call,
    		android.R.drawable.ic_menu_camera
    		};
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_list_view);
        //展示ListView
        showListView();
    }
    
    /**
     * 显示ListView.
     */
    public void showListView(){
    	final Context context = this;
    	Integer[] itemImages = new Integer[allOptionsMenuIcons.length];
    	for(int i=0;i<itemImages.length;i++){
    		itemImages[i] = new Integer(allOptionsMenuIcons[i]);
    	}
    	
    	//绑定GridView组件内容
    	List<Object[]> itemValues = new ArrayList<Object[]>();
    	itemValues.add(allOptionsMenuTexts);
    	itemValues.add(itemImages);
    	
    	//定义适配器to参数
    	int[] to = {R.id.main_list_view_item_item_text,R.id.main_list_view_item_item_image};
    	int resource = R.layout.main_list_view_item;
    	
    	//生成适配器:使用自定义工具类 SimpleAdapterUtil.java来生成适配器
    	SimpleAdapter simpleAdapter = SimpleAdapterUtil.create(context,itemValues,resource,to);
    	
    	ListView listView = (ListView)findViewById(R.id.main_list_view_listview);
    	listView.setAdapter(simpleAdapter);
    	listView.setOnItemClickListener(new OnItemClickListener(){

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				Toast.makeText(context, "["+allOptionsMenuTexts[position]+"]被点击了", Toast.LENGTH_SHORT).show();
			}
    	});
    }

 

备注：SimpleAdapterUtil工具类的完整代码，可以看这篇文章《1个简单的SimpleAdapter工具类-SimpleAdapterUtil 》。