最近在项目遇到一个问题，就是在ExpandListView中有多个ItemView和groupView  每次都需要初始化，这个效率只能呵呵了！思路是如此出发的！

以前我们使用在一个Listview只有单个itemView优化如下！

	FitListViewHolder viewHolder;
		if (convertView == null) {
			convertView = LayoutInflater.from(context).inflate(
					R.layout.fitlistitem, null);
			viewHolder = new FitListViewHolder(convertView, context);
			convertView.setTag(viewHolder);
		} else {
			viewHolder = (FitListViewHolder) convertView.getTag();
		}

		// 装载数据
		viewHolder.setContent(yiLists.get(position));

一次类推如果为多个责直接扩展为：

 if (symptomResultType == SymptomResultType.SYMPTOM_TYPE_COMMON_METHOD) {
            CommonMethodViewHolder viewHolder;
            if(convertView == null || !(convertView.getTag() instanceof CommonMethodViewHolder)) {
                convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item_common_method, null);
                viewHolder = new CommonMethodViewHolder(convertView, mContext);
                convertView.setTag(viewHolder);
            }else{
                viewHolder = (CommonMethodViewHolder) convertView.getTag();
            }
            Object[] userMethods = userSymptomResultModel.userMethodDatas.toArray();
            viewHolder.setMethodContent((UserMethod) userMethods[childPosition]);
            return convertView;
        } else if (symptomResultType == SymptomResultType.SYMPTOM_TYPE_HABIT) {
            UserHabitViewHolder viewHolder;
            if(convertView == null || !(convertView.getTag() instanceof UserHabitViewHolder)) {
                convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item_habit, null);
                viewHolder = new UserHabitViewHolder(convertView, mContext);
                convertView.setTag(viewHolder);
            }else{
                viewHolder = (UserHabitViewHolder) convertView.getTag();
            }
            Object[] userHabits = userSymptomResultModel.userHabitDatas.toArray();
            viewHolder.setHabitContent((UserHabit) userHabits[childPosition]);
            return convertView;
        }

debug执行了我想要的结果！

欢迎大家拍砖！

ExpandListView 多个ItemView的效率优化