Пожалуйста, проверьте этот URL
https://pub.dartlang.org/packages/qrcode_reader
Вот код реализации
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:qrcode_reader/QRCodeReader.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'QRCode Reader Demo',
home: new MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
final Map<String, dynamic> pluginParameters = {
};
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Future<String> _barcodeString;
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: const Text('QRCode Reader Example'),
),
body: new Center(
child: new FutureBuilder<String>(
future: _barcodeString,
builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
return new Text(snapshot.data != null ? snapshot.data : '');
})),
floatingActionButton: new FloatingActionButton(
onPressed: () {
setState(() {
_barcodeString = new QRCodeReader()
.setAutoFocusIntervalInMs(200)
.setForceAutoFocus(true)
.setTorchEnabled(true)
.setHandlePermissions(true)
.setExecuteAfterPermissionGranted(true)
.scan();
});
},
tooltip: 'Reader the QRCode',
child: new Icon(Icons.add_a_photo),
),
);
}
}