当然，以下是如何在Flutter中使用qr_code_scanner和qrcode_generator插件来生成和扫描二维码的示例代码。

1. 添加依赖

首先，你需要在pubspec.yaml文件中添加这两个插件的依赖：

dependencies:
  flutter:
    sdk: flutter
  qrcode_generator: ^1.0.0  # 请确保使用最新版本
  qr_code_scanner: ^0.6.0    # 请确保使用最新版本

然后运行flutter pub get来安装依赖。

2. 生成二维码

创建一个新的Dart文件，比如qrcode_page.dart，用于生成二维码：

import 'package:flutter/material.dart';
import 'package:qrcode_generator/qrcode_generator.dart';
import 'dart:typed_data';
import 'dart:ui' as ui;

class QRCodePage extends StatelessWidget {
  final String qrCodeText;

  QRCodePage({required this.qrCodeText});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Generate QR Code'),
      ),
      body: Center(
        child: CustomPaint(
          size: Size(200, 200),
          painter: QRCodePainter(
            data: qrCodeText,
            version: QRVersionAuto,
            errorCorrectionLevel: QRErrorCorrectionLevel.H,
          ),
        ),
      ),
    );
  }
}

class QRCodePainter extends CustomPainter {
  final String data;
  final QRVersion version;
  final QRErrorCorrectionLevel errorCorrectionLevel;

  QRCodePainter({
    required this.data,
    this.version = QRVersionAuto,
    this.errorCorrectionLevel = QRErrorCorrectionLevel.H,
  });

  Uint8List qrCode!;

  @override
  void paint(Canvas canvas, Size size) {
    final Paint paint = Paint()
      ..color = Colors.black
      ..style = PaintingStyle.fill;

    qrCode = generateQRCode(
      data: data,
      version: version,
      errorCorrectionLevel: errorCorrectionLevel,
    )!;

    final qrImage = drawQrCode(qrCode, size.width, size.height);
    canvas.drawImage(qrImage, Offset.zero, paint);
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return oldDelegate != this;
  }

  ui.Image drawQrCode(Uint8List qrCode, double width, double height) {
    final ByteData byteData = qrCode.buffer.asByteData();
    final ui.Codec codec = await ui.instantiateImageCodec(byteData.buffer.asUint8List());
    final ui.FrameInfo frameInfo = await codec.getNextFrame();
    return frameInfo.image.scale(width, height);
  }
}

3. 扫描二维码

创建一个新的Dart文件，比如qrcode_scanner_page.dart，用于扫描二维码：

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

class QRCodeScannerPage extends StatefulWidget {
  @override
  _QRCodeScannerPageState createState() => _QRCodeScannerPageState();
}

class _QRCodeScannerPageState extends State<QRCodeScannerPage> {
  final GlobalKey qrKey = GlobalKey(debugLabel: 'QR-reader-key');
  Barcode? result;
  String qrText = "No QR code scanned";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('QR Code Scanner'),
      ),
      body: Column(
        children: <Widget>[
          Expanded(
            flex: 5,
            child: QRView(
              key: qrKey,
              onQRViewCreated: _onQRViewCreated,
            ),
          ),
          Expanded(
            flex: 1,
            child: Center(
              child: Text(
                qrText,
                style: TextStyle(fontSize: 20),
              ),
            ),
          ),
        ],
      ),
    );
  }

  void _onQRViewCreated(QRViewController controller) {
    controller.scannedDataStream().listen((scanData) {
      setState(() {
        result = scanData;
        qrText = result?.code ?? "No QR code scanned";
      });
    });
  }

  @override
  void dispose() {
    qrKey.currentState?.dispose();
    super.dispose();
  }
}

4. 配置权限和初始化QRView

在你的MainApplication.kt（Android）或Info.plist（iOS）中添加必要的权限，并配置QRView的初始化。

Android (MainApplication.kt)

确保在MainActivity.kt中添加以下代码来请求摄像头权限：

import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.camera.CameraPlugin

class MainActivity: FlutterActivity() {
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)
        CameraPlugin.registerWith(flutterEngine.dartExecutor.binaryMessenger)
    }
}

iOS (Info.plist)

在Info.plist中添加以下权限：

<key>NSCameraUsageDescription</key>
<string>Need camera access to scan QR codes</string>
<key>NSMicrophoneUsageDescription</key>
<string>Need microphone access</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Need photo library access</string>

5. 主应用入口

最后，在你的main.dart文件中添加路由来导航到生成和扫描二维码的页面：

import 'package:flutter/material.dart';
import 'qrcode_page.dart';
import 'qrcode_scanner_page.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'QR Code Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      initialRoute: '/',
      routes: {
        '/': (context) => Scaffold(
          appBar: AppBar(
            title: Text('QR Code Demo'),
          ),
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                ElevatedButton(
                  onPressed: () => Navigator.push(
                    context,
                    MaterialPageRoute(builder: (context) => QRCodePage(qrCodeText: "https://flutter.dev")),
                  ),
                  child: Text('Generate QR Code'),
                ),
                SizedBox(height: 20),
                ElevatedButton(
                  onPressed: () => Navigator.push(
                    context,
                    MaterialPageRoute(builder: (context) => QRCodeScannerPage()),
                  ),
                  child: Text('Scan QR Code'),
                ),
              ],
            ),
          ),
        ),
      },
    );
  }
}

这段代码提供了一个完整的Flutter应用示例，用于生成和扫描二维码。确保你遵循所有步骤并正确配置依赖和权限。