Question

我目前正在尝试实现使用适配器的ExtendedListView。我正在一项活动中实现这样的视图：

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

GroupView的构造函数如下所示：

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

}

适配器看起来像这样：

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());
            }
        }
    }
}

当通过适配器时，我看到组被添加到它们应该的位置，但我实际上无法在模拟器中看到任何内容。它只是一个白色背景。你能告诉我我真正想要的是什么吗？

修改：好的，这是一个简单的adapter.notifyDataSetChanged();缺少

Answer 1

好的，这是一个简单的adapter.notifyDataSetChanged();缺少（调用updateView()后）

在另一个类中定义的ExtendedListView是不可见的

1 个答案: