Android ExpandableListView 子标题答案

【问题标题】：Android ExpandableListView Child HeadersAndroid ExpandableListView 子标题
【发布时间】：2010-08-26 17:15:10
【问题描述】：

我需要在 ExpandableListView 中的展开子项的顶部添加一个标题。相同的标题应出现在所有展开的子项的顶部。我一直在尝试从这样的适配器中做到这一点：

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。这似乎可行，但随后随机 convertView 将是 childPosition 处的 R.layout.child_header 而不是 0。这会中断 getTextLabel() 调用。

有没有更好的方法来做到这一点？我真正想要的是这样的：

myExpandableListView.addChildHeaderView(new ChildHeader())

我已经通过创建像这样而不是像上面那样的视图解决了这个问题

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！

【问题讨论】：

我面临同样的问题，我没有得到你的实施。请您再分享一些代码。

标签： android expandablelistview

【解决方案1】：

抱歉回复晚了，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;
        }

【讨论】：