有没有办法在Flutter的文本字段中显示条形码值？

dependencies:
  barcode_scan: ^3.0.0

import 'package:flutter/material.dart';
import 'package:barcode_scan/barcode_scan.dart';
import 'package:flutter/services.dart';

class BarcodeScanner extends StatefulWidget {
  @override
  _BarcodeScannerState createState() => _BarcodeScannerState();
}

class _BarcodeScannerState extends State<BarcodeScanner> {
  String barcode = "";

  Future scanBarcode() async {
    try {
      String barcodeResult = await BarcodeScanner.scan();
      setState(() {
        barcode = barcodeResult;
      });
    } on PlatformException catch (e) {
      if (e.code == BarcodeScanner.CameraAccessDenied) {
        setState(() {
          barcode = '无法访问相机';
        });
      } else {
        setState(() {
          barcode = '发生错误：$e';
        });
      }
    } on FormatException{
      setState(() {
        barcode = '扫描取消';
      });
    } catch (e) {
      setState(() {
        barcode = '发生错误：$e';
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('条形码扫描'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              '扫描结果:',
              style: TextStyle(fontSize: 20.0),
            ),
            SizedBox(height: 20.0),
            Text(
              barcode,
              style: TextStyle(fontSize: 16.0),
            ),
            SizedBox(height: 20.0),
            RaisedButton(
              onPressed: scanBarcode,
              child: Text('扫描条形码'),
            ),
          ],
        ),
      ),
    );
  }
}

void main() => runApp(MaterialApp(
  home: BarcodeScanner(),
));