[Tutorial:] ExpandableView mit X Leveln

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dip">

<LinearLayout 
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView 
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
               android:text="Version: 1.0"/>
               
    <TextView 
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
               android:text="Stand: 5. Mai 2011"
               android:layout_marginBottom="20dip"
              />
    
 <ExpandableListView android:id="@+id/android:list"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent"/>
 
     <TextView android:id="@+id/android:empty"
               android:layout_width="fill_parent"
               android:layout_height="wrap_content"
               android:text="No items"/>
</LinearLayout>

</ScrollView>

<ExpandableListView android:id="@+id/android:list"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent"
               android:dividerHeight="2dip"
               android:groupIndicator="@drawable/pfeil_rechts"
               android:childIndicator="@drawable/pfeil_runter"
               />

HashMap child = new HashMap();
            child.put( "Sub Item", "Langer Text........." );
            secList.add( child );

ExpandableListView.setGroupIndicator(R.drawable.pfeil_rechts);

package de.expand.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
 
public class home extends ExpandableListActivity {
 
    @SuppressWarnings("unchecked")
    public void onCreate(Bundle savedInstanceState) {
        try{
             super.onCreate(savedInstanceState);
             setContentView(R.layout.main);
 
        SimpleExpandableListAdapter expListAdapter =
            new SimpleExpandableListAdapter(
                    this,
                    createGroupList(),              // Creating group List.
                    R.layout.group_row,             // Group item layout XML.
                    new String[] { "Group Item" },  // the key of group item.
                    new int[] { R.id.row_name },    // ID of each group item.-Data under the key goes into this TextView.
                    createChildList(),              // childData describes second-level entries.
                    R.layout.child_row,             // Layout for sub-level entries(second level).
                    new String[] {"Sub Item"},      // Keys in childData maps to display.
                    new int[] { R.id.grp_child}     // Data under the keys above go into these TextViews.
                );
            setListAdapter( expListAdapter );       // setting the adapter in the list.
 
        }catch(Exception e){
            System.out.println("Errrr +++ " + e.getMessage());
        }
    }
 
    /* Creating the Hashmap for the row */
    @SuppressWarnings("unchecked")
    private List createGroupList() {
          ArrayList result = new ArrayList();
          for( int i = 0 ; i < 1 ; ++i ) { // 15 groups........
            HashMap m = new HashMap();
            m.put( "Group Item","Listenelement 1"  ); // the key and it's value.
            result.add( m );
            HashMap m1 = new HashMap();
            m1.put( "Group Item","Listenelement 2"  ); // the key and it's value.
            result.add( m1 );
            HashMap m2 = new HashMap();
            m2.put( "Group Item","Listenelement 3"  ); // the key and it's value.
            result.add( m2 );
          }
          return (List)result;
    }
 
    /* creatin the HashMap for the children */
    @SuppressWarnings("unchecked")
    private List createChildList() {
 
        ArrayList result = new ArrayList();
        for( int i = 0 ; i < 3 ; ++i ) { // this -15 is the number of groups(Here it's fifteen)
          /* each group need each HashMap-Here for each group we have 3 subgroups */
          ArrayList secList = new ArrayList();
          for( int n = 0 ; n < 1 ; n++) {
            HashMap child = new HashMap();
            child.put( "Sub Item", "Erklärender Text 1" );
            secList.add( child );
          }          
          ArrayList secList2 = new ArrayList();
          for( int n = 0 ; n < 1 ; n++ ) {
            HashMap child1 = new HashMap();
            child1.put( "Sub Item", "Erklärender Text 2" );
            secList2.add( child1 );
          }
          ArrayList secList3 = new ArrayList();
          for( int n = 0 ; n < 1 ; n++ ) {
            HashMap child2 = new HashMap();
            child2.put( "Sub Item", "Erklärender Text 3" );
            secList3.add( child2 );
          }
         result.add( secList );
         result.add( secList2 );
         result.add( secList3 );
        }
        return result;
    }
    public void  onContentChanged  () {
        System.out.println("onContentChanged");
        super.onContentChanged();
    }
    /* This function is called on each child click */
    public boolean onChildClick( ExpandableListView parent, View v, int groupPosition,int childPosition,long id) {
        System.out.println("Inside onChildClick at groupPosition = " + groupPosition +" Child clicked at position " + childPosition);
        return true;
    }
 
    /* This function is called on expansion of the group */
    public void  onGroupExpand  (int groupPosition) {        
        try{           
             System.out.println("Group exapanding Listener => groupPosition = " + groupPosition);
        }catch(Exception e){
            System.out.println(" groupPosition Errrr +++ " + e.getMessage());
        }
    }
}