最近在項目遇到一個問題,就是在ExpandListView中有多個ItemView和groupView 每次都需要初始化,這個效率只能呵呵了!思路是如此出發的!
以前我們使用在一個Listview只有單個itemView優化如下!
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();
}
// 裝載數據
viewHolder.setContent(yiLists.get(position));
大部分人應該都是這麼處理的,我也是這樣處理的!
一次類推如果爲多個責直接擴展爲:
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;
}
中心思想就是根據contentView是否爲空或者不爲空的情況下獲取gettag然後看看是否是當前item需要的View,如果不是責再去創建。根據tag去獲取就OK了!
debug執行了我想要的結果!
歡迎大家拍磚!