如下：
public 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;
}
}
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