ViewHolder的经典用法

今天在看项目代码的时候,发现了一个经典的viewHolder用法。

抽象出了一种经典的存储view的方法



public class ViewHolder {
// I added a generic return type to reduce the casting noise in client code
@SuppressWarnings("unchecked")
public static  T get(View view, int id) {
SparseArray viewHolder = (SparseArray) view.getTag();
if (viewHolder == null) {
viewHolder = new SparseArray();
view.setTag(viewHolder);
}
View childView = viewHolder.get(id);
if (childView == null) {
childView = view.findViewById(id);
viewHolder.put(id, childView);
}
return (T) childView;
}
}

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