Flutter frosted glass effect realization

import 'package:flutter/material.dart';
import 'frosted_glass_demo.dart';

void main()=>  runApp(MyApp());

class MyApp extends StatelessWidget {
    
    
  @override
  Widget build(BuildContext context) {
    
    
    // TODO: implement build
    return MaterialApp(
      title: 'flutter',
      theme: ThemeData(
        primarySwatch: Colors.blue
      ),
      home: Scaffold(
        body: FrostedClassDemo(),
      ),
    );
  }
}

import 'package:flutter/material.dart';
import 'dart:ui';

class FrostedClassDemo extends StatelessWidget{
    
    
  @override
  Widget build(BuildContext context) {
    
    
    return Scaffold(
      body: Stack(
        children: <Widget>[
          ConstrainedBox(// 约束盒子组件
            constraints: const BoxConstraints.expand(),
            child: Image.network('https://oss.wangmiaozero.cn/blogs/Carousel/5.png'),
          ),
          Center(
            child: ClipRect(
              // 可裁切的矩形
              child: BackdropFilter(
                filter: ImageFilter.blur(sigmaX: 5.0,sigmaY: 5.0),
                child: Opacity(
                  opacity: 0.5,
                  child: Container(
                    width: 500.0,
                    height: 700.0,
                    decoration: BoxDecoration(color: Colors.grey.shade200),
                    child: Center(
                      child: Text('毛玻璃',style: Theme.of(context).textTheme.display3
                      ),
                    ),
                  ),
                ),
              ),
            ),
          )
        ],
      ),
    );
  }
}