flutter_barcode_reader/example/lib/main.dart

import 'dart:async';

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String barcode = "";

  @override
  initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
          appBar: new AppBar(
            title: new Text('Barcode Scanner Example'),
          ),
          body: new Center(
            child: new Column(
              children: <Widget>[
                new Container(
                  child: new MaterialButton(
                      onPressed: scan, child: new Text("Scan")),
                  padding: const EdgeInsets.all(8.0),
                ),
                new Text(barcode),
              ],
            ),
          )),
    );
  }

  Future scan() async {
    String barcode = await BarcodeScanner.scan();
    setState(() => this.barcode = barcode);
  }
}