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ViewHolder的经典用法<SparseArray>

时间:2024-3-2 17:38     作者:韩俊     分类: Android


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



[java] view
plaincopy

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;
}
}

标签: android

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