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));
大部分人应该都是这么处理的,我也是这样处理的!
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;
}
中心思想就是根据contentView是否为空或者不为空的情况下获取gettag然后看看是否是当前item需要的View,如果不是责再去创建。根据tag去获取就OK了!
debug执行了我想要的结果!
欢迎大家拍砖!