万能的ViewHolder

/*
 * 万能的ViewHolder
 */
public 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 chidlView = viewHolder.get(id);
if (chidlView == null) {
chidlView = view.findViewById(id);
viewHolder.put(id, chidlView);
}
return (T)chidlView;
}
}