Flutter中如何实现扫码

dependencies:
  flutter_barcode_scanner: ^3.0.0

import 'package:flutter_barcode_scanner/flutter_barcode_scanner.dart';

// 初始化扫码
String barcodeScanResult = '';

Future<void> scanBarcode() async {
  String barcodeResult;
  
  try {
    barcodeResult = await FlutterBarcodeScanner.scanBarcode(
      "#FF0000", // 扫码界面的主题颜色
      "取消", // 取消按钮文本
      true, // 是否显示闪光灯按钮
      ScanMode.QR, // 扫码类型，例如QR码
    );
  } catch (e) {
    barcodeResult = '扫码错误：$e';
  }

  setState(() {
    barcodeScanResult = barcodeResult;
  });
}

FloatingActionButton(
  onPressed: scanBarcode,
  child: Icon(Icons.qr_code_scanner),
)

Text(barcodeScanResult),