So Hlo Guys This is Shivam And in this article we learn how To Generate Qr Code and Scan Qr code in flutter framework .If u liked this article please share this article with your friends .
So lets write code first :
void main(){
runApp(Myapp());
}
class Myapp extends StatelessWidget {
const Myapp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Qr code generator',
debugShowCheckedModeBanner: false,
home: first(),
);
}
}
Explanation:
First we a header function
And this material run app
And add stetful widgets that are used in the generating first app
and then retun in Material App becouse we make an app not a single page app
we place a name title
and then checking our banner
and a home function that redirect new page
class first extends StatefulWidget {
const first({super.key});
@override
State<first> createState() => _firstState();
}
class _firstState extends State<first> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Qr Generator',style: TextStyle(color:
Colors.white,fontSize: 30),),
backgroundColor: Colors.green,),
endDrawer: AppD(),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton( onPressed: (){
setState(() {
Navigator.of(context).push(MaterialPageRoute(builder:
(context)=>ScanQR()));
});
}, child: Text('Scan qr code',)),
SizedBox(height: 20,),
ElevatedButton(onPressed: (){
setState(() {
Navigator.of(context).push(MaterialPageRoute(builder:
(context)=>GenerateQr()));
});
}, child: Text('Generate Qr code')),
],
),
),
);
}
}
we make a stateful widgets and add first becouse that we make before we add here and the steteful widgets gets managed the widgets
Scaffold : then we add that are the material who used in adding all the apps widgets in the scaffold.
App bar : then we adding It is the function that build a simple layout in the upper side of page .in the app bar we add title and we managed the text like text style and their color and widgets and other things
we add some background color in the app bar
Drawer : It is the menu button or like it place on the right side of the app bar darwer are mainly used for add new items or another page int the apps
Body: then we add body it uses for different different types then in the body we add centre and
centre means all we write in the body this comes in the centre .
Column : it uses for if any type function we made in the page then the function placed in the column wise that the use of column
Mainaxixalignment : means it decide where u want to placed the text or image
Children : it used for adding some sdditional features and that we want
ElevatedButton : its used for ading button option in the page and it may be different types so we only add set state function that is control the elevated button and other things
Navigator : it is uesd for adding new page in the previous page this function navigate to the user in a new page ;
Scanqr : we make this page so we navigate first in this page
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_barcode_scanner/flutter_barcode_scanner.dart'; // Import the barcode scanner
class ScanQR extends StatefulWidget {
const ScanQR({Key? key}) : super(key: key);
@override
State<ScanQR> createState() => _ScanQRState();
}
class _ScanQRState extends State<ScanQR> {
String qrResult = 'Scanned Data will appear here';
// Function to scan the QR code
Future<void> scanQR() async {
try {
final qrCode = await FlutterBarcodeScanner.scanBarcode(
'#ff6666', // Custom color for the scanning line
'Cancel', // Cancel button text
true, // Show flash icon
ScanMode.QR, // Scan mode as QR code
);
if (qrCode == '-1') {
// If the user cancels the scan
return;
}
setState(() {
qrResult = qrCode;
});
} on PlatformException {
setState(() {
qrResult = 'Failed to read QR code';
});
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Scan QR Code'),
),
body: Center(
child: SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
const SizedBox(height: 10),
Text(
qrResult,
style: const TextStyle(color: Colors.black, fontSize: 16),
textAlign: TextAlign.center,
),
const SizedBox(height: 38),
ElevatedButton(
onPressed: scanQR,
child: const Text('Scan QR'),
),
],
),
),
),
);
}
}
In this code we see the code of scanqr
Lets understand the code
so first we add some dependency in our pubspec.yaml becouse without dependency our code will be not run.
Lets describe about this page
Barcode scanner : we add this dependency on this page
then add steteful widgets
in the steful widgets we add some logic about the qr scanner
sizedbox : it is the function who make the difference in the about the two columns
Generateqr
import 'package:flutter/material.dart';
//import 'package:qr_flutter/qr_flutter.dart'; // Import the QR code generator package
class GenerateQr extends StatefulWidget {
const GenerateQr({Key? key}) : super(key: key);
@override
State<GenerateQr> createState() => _GenerateQrState();
}
class _GenerateQrState extends State<GenerateQr> {
TextEditingController urlController = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Generate QR Code'),
),
body: Center(
child: SingleChildScrollView(
padding: const EdgeInsets.all(16.0), // Added padding for better UI
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
// Display the QR code only if there is some text
if (urlController.text.isNotEmpty)
const SizedBox(height: 20),
TextField(
controller: urlController,
decoration: InputDecoration(
hintText: 'Enter your data',
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(15),
),
labelText: 'Enter your data',
),
),
const SizedBox(height: 20),
ElevatedButton(
onPressed: () {
if (urlController.text.isEmpty) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('Please enter some data to generate QR code'),
),
);
return;
}
setState(() {
// Trigger UI update to display the QR code
});
},
child: const Text('Generate QR Code'),
),
],
),
),
),
);
}
}
This is the code of generatedqr
.png)
0 Comments