如何在flutter应用中设置固定屏幕大小

dependencies:
  flutter_screenutil: ^4.0.2

import 'package:flutter_screenutil/flutter_screenutil.dart';

@override
Widget build(BuildContext context) {
  // 初始化ScreenUtil
  ScreenUtil.init(context, width: 750, height: 1334, allowFontScaling: true);

  return Scaffold(
    appBar: AppBar(
      title: Text('固定屏幕大小示例'),
    ),
    body: Container(
      width: ScreenUtil().setWidth(375), // 设置宽度为屏幕宽度的一半
      height: ScreenUtil().setHeight(200), // 设置高度为200逻辑像素
      child: Text(
        '固定屏幕大小示例',
        style: TextStyle(fontSize: ScreenUtil().setSp(30)), // 设置字体大小为30逻辑像素
      ),
    ),
  );
}