在另一個類中定義的ExtendedListView是不可見的

我目前正試圖實現使用Adapter的ExtendedListView。我實現視圖這樣一個活動：在另一個類中定義的ExtendedListView是不可見的

groupView = new GroupView((ExpandableListView) findViewById(R.id.groupView), getApplicationContext());

GroupView的構造是這樣的：

public GroupView(ExpandableListView list, Context c) 
{ 
    context = c; 
    expandableListView = list; 
    adapter = new GroupViewAdapter(context, 
      new ArrayList<ParticipantGroup>(), 
      new ArrayList<ArrayList<Participant>>()); 
    expandableListView.setAdapter(adapter); 

}

適配器看起來是這樣的：

public class GroupViewAdapter extends BaseExpandableListAdapter 
{ 

    private Context       context; 
    private ArrayList<ParticipantGroup>  groups; 
    private ArrayList<ArrayList<Participant>> children; 

    public GroupViewAdapter(Context context, ArrayList<ParticipantGroup> groups, 
      ArrayList<ArrayList<Participant>> children) 
    { 
     this.context = context; 
     this.groups = groups; 
     this.children = children; 
    } 


    /** 
    * Gets the complete structure (Map of groups with a list of participants 
    * each) and draws it 
    */ 
    public void updateView() 
    { 
     Map<String, ParticipantGroup> groupMap = GroupManager.getInstance() 
       .getGroups(); 
     for (Map.Entry<String, ParticipantGroup> entry : groupMap.entrySet()) 
     { 
      String groupName = entry.getKey(); 
      ParticipantGroup group = entry.getValue(); 

      if(!groups.contains(group)) //In case the group does not exist yet, it gets created 
      { 
       groups.add(group); 
      } 
      int index = groups.indexOf(group); 
      if (children.size() < index + 1) { 
       children.add(new ArrayList<Participant>()); 
      } 
      ArrayList<Participant> participants = group.getParticipants(); 
      Iterator<Participant> itr = participants.iterator(); 
      while(itr.hasNext()) 
      { 
       children.get(index).add(itr.next()); 
      } 
     } 
    } 
}

去當通過適配器，我看到組添加到他們應該在的位置，但我實際上無法在模擬器中看到任何東西。這只是一個白色的背景。你能告訴我我錯過了什麼讓它可見嗎？

編輯：好吧，這是一個簡單的adapter.notifyDataSetChanged();這是缺少

來源

2011-04-26 Lars

好吧，這是一個簡單的adapter.notifyDataSetChanged();這是缺少

（主叫 updateView()後）

來源

2011-04-27 08:05:20 Lars

在另一個類中定義的ExtendedListView是不可見的

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