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 { 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: [ 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 BarcodeScan.scan(); setState(() => this.barcode = barcode); } }