如何使用Flutter在侧边栏菜单上添加背景图像？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Sidebar',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Sidebar'),
      ),
      drawer: Drawer(
        child: Stack(
          children: [
            Container(
              decoration: BoxDecoration(
                image: DecorationImage(
                  image: AssetImage('assets/background_image.jpg'),
                  fit: BoxFit.cover,
                ),
              ),
            ),
            ListView(
              padding: EdgeInsets.zero,
              children: [
                DrawerHeader(
                  child: Text(
                    'Sidebar Menu',
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: 24,
                    ),
                  ),
                  decoration: BoxDecoration(
                    color: Colors.blue,
                  ),
                ),
                ListTile(
                  title: Text('Item 1'),
                  onTap: () {
                    // Handle item 1 tap
                  },
                ),
                ListTile(
                  title: Text('Item 2'),
                  onTap: () {
                    // Handle item 2 tap
                  },
                ),
                ListTile(
                  title: Text('Item 3'),
                  onTap: () {
                    // Handle item 3 tap
                  },
                ),
              ],
            ),
          ],
        ),
      ),
      body: Center(
        child: Text(
          'Main Content',
          style: TextStyle(fontSize: 24),
        ),
      ),
    );
  }
}

flutter:
  assets:
    - assets/background_image.jpg