Esiste un tag XML equivalente a `ListView.addHeaderView '?

Question

Esiste un tag XML che posso utilizzare in un file di layout equivalente a ListView.addHeaderView()?

Answer 1

Ho scritto un semplice ListView come il vostro requisito.

1. Declare attributo personalizzato in attrs.xml nella cartella value:

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

2. Creare HeaderListViewFromXML classe estesa 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. Dichiarare personalizzato HeaderListViewFromXML in layout.xml

   <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. In Attività, utilizzare come normale ListView

   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); 
       } 
   }