3级ExpandableListView中第二级组的Groupposition为0

Question

大家好，我正在从教程here做一个三级ExpandablelistView。 列表项目正确显示，但第二级别组的每个项目的组合为0。 我用这段代码来获得小组位置。

convertView.setOnClickListener(new OnClickListener() {  
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                System.out.println("GROUP POSITION= "+gpos);
            }
        });

我的完整适配器代码：

    public class Adapter extends BaseExpandableListAdapter {
      private List<Object> objects;
      private Activity activity;
      private LayoutInflater inflater;

     public Adapter(Activity activity, List<Object> objects) {
       this.objects= objects;
       this.activity= activity;
       this.inflater= (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     }

     @Override
     public Object getChild(int groupPosition, int childPosition) {
      return objects.get(groupPosition).getObjects().get(childPosition);
     }

     @Override
     public long getChildId(int groupPosition, int childPosition) {
      return childPosition;
     }

     @Override
     public View getChildView(int groupPosition, int childPosition,
       boolean isLastChild, View convertView, ViewGroup parent) {

      Object object= (Object) getChild(groupPosition, childPosition);
      CustomExpandableListView subObjects= (CustomExpandableListView) convertView;;
      if (convertView==null) {
       subObjects= new CustomExpandableListView(activity);
      }
      Adapter2 adapter= new Adapter2(activity, object);
      subObjects.setAdapter(adapter);

      return subObjects;
     }

     @Override
     public int getChildrenCount(int groupPosition) {
      return objects.get(groupPosition).getObjects().size();
     }

     @Override
     public Object getGroup(int groupPosition) {
      return objects.get(groupPosition);
     }

     @Override
     public int getGroupCount() {
      return objects.size();
     }

     @Override
     public long getGroupId(int groupPosition) {
      return groupPosition;
     }

     @Override
     public View getGroupView(int groupPosition, boolean isExpanded,
       View convertView, ViewGroup parent) {

      Object object= (Object) getGroup(groupPosition);
      if (convertView==null) {
       convertView= inflater.inflate(R.layout.listview_element, null);
      }

      TextView name= (TextView) convertView.findViewById(R.id.name);
      name.setText(object.getName());

      return convertView;
     }

     @Override
     public boolean hasStableIds() {
      return true;
     }

     @Override
     public boolean isChildSelectable(int groupPosition, int childPosition) {
      return true;
     }
    }


    class Adapter2 extends BaseExpandableListAdapter {
     private Object object;
     private LayoutInflater inflater; 
     private Activity activity;

     public Adapter2(Activity activity, Object object) {
      this.activity= activity;
      this.object= object;
      this.inflater= (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     }

     @Override
     public Object getChild(int groupPosition, int childPosition) {
      return object.getObjects().get(childPosition);
     }

     @Override
     public long getChildId(int groupPosition, int childPosition) {
      return childPosition;
     }

     @Override
     public View getChildView(int groupPosition, int childPosition,
       boolean isLastChild, View convertView, ViewGroup parent) {

      Object object= (Object) getChild(0, childPosition);
      if (convertView==null) {
       convertView= inflater.inflate(R.layout.listview_element, null);

       Resources r = activity.getResources();
       float px40 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 40, r.getDisplayMetrics());
       convertView.setPadding(
         convertView.getPaddingLeft() + (int) px40,
         convertView.getPaddingTop(),
         convertView.getPaddingRight(),
         convertView.getPaddingBottom());
      }

      TextView name= (TextView) convertView.findViewById(R.id.name);
      name.setText(object.getName());

      return convertView;
     }

     @Override
     public int getChildrenCount(int groupPosition) {
      return object.getObjects().size();
     }

     @Override
     public Object getGroup(int groupPosition) {
      return object;
     }

     @Override
     public int getGroupCount() {
      return 1;
     }

     @Override
     public long getGroupId(int groupPosition) {
      return groupPosition;
     }

     @Override
     public View getGroupView(int groupPosition, boolean isExpanded,
       View convertView, ViewGroup parent) {

      if (convertView==null) {
       convertView= inflater.inflate(R.layout.listview_element, null);
       Resources r = activity.getResources();
       float px20 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20,      r.getDisplayMetrics());
       convertView.setPadding(
         convertView.getPaddingLeft() + (int) px20,
         convertView.getPaddingTop(),
         convertView.getPaddingRight(),
         convertView.getPaddingBottom()); 
      }

      TextView name= (TextView) convertView.findViewById(R.id.name);
      name.setText(object.getName());    
   convertView.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            System.out.println("GROUP POSITION= "+gpos);
        }
    });
      return convertView;
     }

     @Override
     public boolean hasStableIds() {
      return true;
     }

     @Override
     public boolean isChildSelectable(int groupPosition, int childPosition) {
      return true;
     }
    }

我该如何解决这个问题？