Flutter. Scan QR Code, redirect to Screen - ios

Question

I would like to create my own QR Code, Print it and whenever I want to scan it with my flutter app, it should redirect me to a screen of the app.
Is this possible?

Answer 1

import the qr_flutter package on pub.dev, this is the code to use below
import 'dart:developer';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:qr_code_scanner/qr_code_scanner.dart';
void main() => runApp(MaterialApp(home: MyHome()));
class MyHome extends StatelessWidget {
const MyHome({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Flutter Demo Home Page')),
body: Center(
child: ElevatedButton(
onPressed: () {
Navigator.of(context).push(MaterialPageRoute(
builder: (context) => QRViewExample(),
));
},
child: Text('qrView'),
),
),
);
}
}
class QRViewExample extends StatefulWidget {
#override
State<StatefulWidget> createState() => _QRViewExampleState();
}
class _QRViewExampleState extends State<QRViewExample> {
Barcode? result;
QRViewController? controller;
final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
// In order to get hot reload to work we need to pause the camera if the platform
// is android, or resume the camera if the platform is iOS.
#override
void reassemble() {
super.reassemble();
if (Platform.isAndroid) {
controller!.pauseCamera();
}
controller!.resumeCamera();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Column(
children: <Widget>[
Expanded(flex: 4, child: _buildQrView(context)),
Expanded(
flex: 1,
child: FittedBox(
fit: BoxFit.contain,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
if (result != null)
Text(
'Barcode Type: ${describeEnum(result!.format)} Data: ${result!.code}')
else
Text('Scan a code'),
Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () async {
await controller?.toggleFlash();
setState(() {});
},
child: FutureBuilder(
future: controller?.getFlashStatus(),
builder: (context, snapshot) {
return Text('Flash: ${snapshot.data}');
},
)),
),
Container(
margin: EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () async {
await controller?.flipCamera();
setState(() {});
},
child: FutureBuilder(
future: controller?.getCameraInfo(),
builder: (context, snapshot) {
if (snapshot.data != null) {
return Text(
'Camera facing ${describeEnum(snapshot.data!)}');
} else {
return Text('loading');
}
},
)),
)
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Container(
margin: EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () async {
await controller?.pauseCamera();
},
child: Text('pause', style: TextStyle(fontSize: 20)),
),
),
Container(
margin: EdgeInsets.all(8),
child: ElevatedButton(
onPressed: () async {
await controller?.resumeCamera();
},
child: Text('resume', style: TextStyle(fontSize: 20)),
),
)
],
),
],
),
),
)
],
),
);
}
Widget _buildQrView(BuildContext context) {
// For this example we check how width or tall the device is and change the scanArea and overlay accordingly.
var scanArea = (MediaQuery.of(context).size.width < 400 ||
MediaQuery.of(context).size.height < 400)
? 150.0
: 300.0;
// To ensure the Scanner view is properly sizes after rotation
// we need to listen for Flutter SizeChanged notification and update controller
return QRView(
key: qrKey,
onQRViewCreated: _onQRViewCreated,
overlay: QrScannerOverlayShape(
borderColor: Colors.red,
borderRadius: 10,
borderLength: 30,
borderWidth: 10,
cutOutSize: scanArea),
onPermissionSet: (ctrl, p) => _onPermissionSet(context, ctrl, p),
);
}
void _onQRViewCreated(QRViewController controller) {
setState(() {
this.controller = controller;
});
controller.scannedDataStream.listen((scanData) {
setState(() {
result = scanData;
});
});
}
void _onPermissionSet(BuildContext context, QRViewController ctrl, bool p) {
log('${DateTime.now().toIso8601String()}_onPermissionSet $p');
if (!p) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('no Permission')),
);
}
}
#override
void dispose() {
controller?.dispose();
super.dispose();
}
}

Answer 2

Use the qr_flutter package on pub.dev.