ViewHolderの最も簡潔な書き方
2802 ワード
汎用viewHolderツールクラス:
getviewの書き方:
public class ViewHolder {
// I added a generic return type to reduce the casting noise in client code
@SuppressWarnings("unchecked")
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;
}
}
getviewの書き方:
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(context)
.inflate(R.layout.banana_phone, parent, false);
}
TextView ageTv = ViewHolder.get(convertView, R.id.agetv);
TextView nameTv = ViewHolder.get(convertView, R.id.nametv);
Student student = getItem(position);
ageTv .setText(student.getAge());
nameTv.setText(student.getName());
return convertView;
}