Question

我需要在ExpandableListView中向扩展子节点的顶部添加标题。相同的标题应出现在所有展开的子项的顶部。我一直试图从适配器这样做：

public int getChildrenCount(int groupPosition) {
 //Add one extra to children size
 return mGroups.get(groupPosition).size()+1;
}



 public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {
    //if childPosition 0 return the header
    if(childPosition == 0)return convertView = mInflater.inflate(R.layout.child_header, null);

    //childPosition -1 is the actual item
    ChildItem childItem = (ChildItem) getChild(groupPosition, childPosition-1);
    ChildViewHolder holder = null;
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.child_row, null);
    } else {
    holder = (ChildViewHolder) convertView.getTag();
    }

    if(holder == null){
        holder = new ChildViewHolder(convertView);
        convertView.setTag(holder);
    }

    holder.getTextLabel().setText(childItem.name);
    holder.getPriceLabel().setText(String.valueOf(childItem.price));

    return convertView;
}

ChildViewHolder处理在子行中查找视图。这似乎工作，但随后convertView将是除0以外的childPosition的R.layout.child_header。这会打破getTextLabel（）调用。

有更好的方法吗？我真正想要的是这样的：

myExpandableListView.addChildHeaderView(new ChildHeader())

我通过创建像这样的视图而不是上面的

解决了这个问题

if(convertView!=null){
    holder = (ChildViewHolder) convertView.getTag();
 }


if(holder == null){
    convertView = mInflater.inflate(R.layout.child_row, null);
    holder = new ChildViewHolder(convertView);
    convertView.setTag(holder);
}

谢谢！

Answer 1

对不起，迟到的回复，这是我的完整代码

public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
            if(childPosition == 0)return convertView = mInflater.inflate(R.layout.child_header, null);

            // A ViewHolder keeps references to children views to avoid unneccessary calls
            // to findViewById() on each row.
            ChildViewHolder holder = null;

            ChildItem childItem = (ChildItem) getChild(groupPosition, childPosition-1);

            //Get ViewHolder first
            if(convertView!=null){
                holder = (ChildViewHolder) convertView.getTag();
            }

            //If no ViewHolder, then create a new child row as convertView is probably a header
            if(holder == null){
                convertView = mInflater.inflate(R.layout.child_row, null);
                holder = new ChildViewHolder(convertView);
                convertView.setTag(holder);
            }
            holder.getTextLabel().setText(childItem.name);
            holder.getPriceLabel().setText(String.valueOf(childItem.price));
            return convertView;
        }

Android ExpandableListView子标题

1 个答案: