【Android 开发教程】ListView的总结范例

本章节翻译自《Beginning-Android-4-Application-Development》，如有翻译不当的地方，敬请指出。

原书购买地址http://www.amazon.com/Beginning-Android-4-Application-Development/dp/1118199545/

使用一个例子，来总结一下ListView的基本使用。

1. 新建一个工程：ListViewDemo。

2. main.xml中的代码。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    
<Button android:id="@+id/btn"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Show selected items" 
    android:onClick="onClick"/>

<ListView 
    android:id="@+id/android:list"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</LinearLayout>

3. Strings.xml中的代码。

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, BasicViews5Activity!</string>
    <string name="app_name">BasicViews5</string>
    <string-array name="presidents_array">
        <item>Dwight D. Eisenhower</item>
        <item>John F. Kennedy</item>
        <item>Lyndon B. Johnson</item>
        <item>Richard Nixon</item>
        <item>Gerald Ford</item>
        <item>Jimmy Carter</item>
        <item>Ronald Reagan</item>
        <item>George H. W. Bush</item>
        <item>Bill Clinton</item>
        <item>George W. Bush</item>
        <item>Barack Obama</item>
    </string-array>        
</resources>

4. ListViewDemo中的代码。

public class ListViewDemo extends ListActivity  {
	
    String[] presidents;
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);        
        
        setContentView(R.layout.main);

        ListView lstView = getListView();
                		
        //lstView.setChoiceMode(ListView.CHOICE_MODE_NONE); 
        //lstView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); 
        lstView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);        
        lstView.setTextFilterEnabled(true);

        presidents =
                getResources().getStringArray(R.array.presidents_array);

        setListAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_checked, presidents));
    }
    
    public void onListItemClick(
    ListView parent, View v, int position, long id)
    {
        Toast.makeText(this,
            "You have selected " + presidents[position],
            Toast.LENGTH_SHORT).show();
    }
    
    // for button click event
    public void onClick(View view) {
    	ListView lstView = getListView();
    	
    	String itemsSelected = "Selected items: \n";
    	for (int i=0; i<lstView.getCount(); i++) {
    		if (lstView.isItemChecked(i)) {
    			itemsSelected += lstView.getItemAtPosition(i) + "\n";
    		}
    	}
    	Toast.makeText(this, itemsSelected, Toast.LENGTH_LONG).show();
    }

}

5. 按F11在模拟器上面调试。在ListView中选择一些物件，然后点击上面的Button，就会显示出哪些物件被选择了。