ViewHolder工具类【收藏】

ViewHolder的实现

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listview_item_layout, parent, false);
holder = new ViewHolder();
holder.studentName = (TextView) convertView.findViewById(R.id.student_name);
holder.studentAge = (TextView) convertView.findViewById(R.id.student_age);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
Student data = (Student) getItem(position);
holder.studentName.setText(data.getName());
holder.studentAge.setText(data.getAge());
return convertView;
}

class ViewHolder {
public TextView studentName;
public TextView studentAge;
}

ViewHolder的工具类实现

static class ViewHolder {
public static <T extends View> T get(View view, int id) {
SparseArray<View> viewHolder = (SparseArray<View>) view.getTag();
if (viewHolder == null) {
viewHolder = new SparseArray<View>();
view.setTag(viewHolder);
}
View childView = viewHolder.get(id);
if (childView == null) {
childView = view.findViewById(id);
viewHolder.put(id, childView);
}
return (T) childView;
}
}

BaseAdapter中的代码：
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.listview_item_layout, parent, false);
}
TextView name = Tools.ViewHolder.get(convertView, R.id.student_name);
TextView age = Tools.ViewHolder.get(convertView, R.id.student_age);

Student data = (Student) getItem(position);
name.setText(data.getName());
age.setText(data.getAge());

return convertView;
}

原文：http://mobile.51cto.com/aprogram-475335.htm