java - 是否有等效于 `ListView.addHeaderView' 的 XML 标记？

Question

是否有一个 XML 标记，我可以在布局文件中使用它等同于 ListView.addHeaderView() ？

Answer 1

我按照您的要求编写了一个简单的 ListView。

1. 在 value 文件夹的 attrs.xml 中声明自定义属性:

   <resources>
       <declare-styleable name="HeaderListViewFromXML"> 
           <attr name="headerView" format="reference"/>
       </declare-styleable>
   </resources>
   

2. 创建 HeaderListViewFromXML 类扩展 ListView

   public class HeaderListViewFromXML extends ListView {
       private int headerId;
   
       public HeaderListViewFromXML(Context context) {
           this(context, null);
       }
   
       public HeaderListViewFromXML(Context context, AttributeSet attrs) {
           this(context, attrs, 0);
       }
   
       public HeaderListViewFromXML(Context context, AttributeSet attrs, int defStyle) {
           super(context, attrs, defStyle);
           TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.HeaderListViewFromXML, defStyle, defStyle);
   
           try {
               headerId = a.getResourceId(R.styleable.HeaderListViewFromXML_headerView, View.NO_ID);
               if (headerId != View.NO_ID) {
                   LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                   View header = inflater.inflate(headerId, null);
                   addHeaderView(header);
               }
           } finally {
               a.recycle();
           }
       }
   }
   

3. 在 layout.xml 中声明自定义 HeaderListViewFromXML

   <RelativeLayout
           xmlns:android="http://schemas.android.com/apk/res/android"
           xmlns:app="http://schemas.android.com/apk/res-auto"
           android:layout_width="match_parent"
           android:layout_height="match_parent">
       <com.example.rewidget.HeaderListViewFromXML
               android:id="@+id/listWithHeader"
               android:layout_width="fill_parent"
               android:layout_height="150dp"
               android:layout_marginTop="60dp"
               android:background="#00FF00"
               // custom attribute. Point to layout in header1.xml
               app:headerView="@layout/header1" />
   </RelativeLayout>
   

4. 在Activity中，像普通的ListView一样使用

   public class MainActivity extends Activity {
       @Override
       public void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           ListView list = (ListView) findViewById(R.id.listWithHeader);
   
           String[] values = new String[] { "Android", "iPhone", "WindowsMobile", "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X", "Linux", "OS/2" };
           ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, values);
   
           list.setAdapter(adapter);
       }
   }