在Flutter中，如何创建具有磨砂玻璃效果的SliverAppBar？

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

CustomScrollView(
  slivers: <Widget>[
    SliverAppBar(
      title: Text('磨砂玻璃效果'),
      expandedHeight: 200,
      flexibleSpace: FlexibleSpaceBar(
        background: Stack(
          fit: StackFit.expand,
          children: [
            // 背景图片
            Image.network(
              'https://example.com/background_image.jpg',
              fit: BoxFit.cover,
            ),
            // 磨砂玻璃效果
            BackdropFilter(
              filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
              child: Container(
                color: Colors.black.withOpacity(0.5),
              ),
            ),
          ],
        ),
      ),
    ),
    // 其他Sliver组件
  ],
)