QR Code Scanning with Flutter

QR codes have become a popular technology for quick and easy data sharing. In Flutter, you can integrate QR code scanning functionality into your applications using the qr_code_scanner package. In this article, we will explore what qr_code_scanner is, how to use it, and how to create a QR code scanner app in Flutter.

qr_code_scanner is a Flutter package that allows you to scan and process QR codes in Flutter projects. This package provides an advanced QR code scanning feature that captures the camera stream and recognizes QR codes. Using qr_code_scanner is straightforward and provides a quick solution to add QR code scanning capabilities to your application.

To begin, you need to add the qr_code_scanner package to your project by updating the ‘pubspec.yaml’ file. Then, you can create a screen or component that will scan the QR codes. For example, you can add a QR code scanner button and start the camera stream when the button is clicked.

The qr_code_scanner package utilizes Flutter’s camera APIs to access the camera. Therefore, you need to configure the necessary permissions for your application to work. You must add camera permissions in the Manifest file (Android) or the Info.plist file (iOS) and request camera access from the user.

To perform the QR code scanning process using the qr_code_scanner package in your application, you need to create a QR code scanner component. This component will open the camera, scan QR codes, and process the results using the features provided by the qr_code_scanner package. You can create a suitable user interface to display the scanned QR code and take appropriate actions.

With the qr_code_scanner package in Flutter, you can develop QR code scanner applications. This package offers easy integration into Flutter projects and provides advanced QR code scanning features. By utilizing qr_code_scanner, you can enhance your applications with the ability to scan QR codes efficiently.

Let’s create simple app

1. Set Up the Project: Create a new Flutter project and add the qr_code_scanner package to your pubspec.yaml file:

dependencies:
  flutter:
    sdk: flutter
  qr_code_scanner: ^x.x.x // Replace with the latest version

Implement the QR Code Scanner: Replace the content of the ‘lib/main.dart’ file with the following code:

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

void main() => runApp(QRCodeScannerApp());

class QRCodeScannerApp extends StatefulWidget {
  @override
  _QRCodeScannerAppState createState() => _QRCodeScannerAppState();
}

class _QRCodeScannerAppState extends State<QRCodeScannerApp> {
  QRViewController _controller;
  final GlobalKey _qrKey = GlobalKey(debugLabel: 'QR');

  @override
  void dispose() {
    _controller?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('QR Code Scanner'),
        ),
        body: Column(
          children: [
            Expanded(
              flex: 5,
              child: QRView(
                key: _qrKey,
                onQRViewCreated: _onQRViewCreated,
              ),
            ),
            Expanded(
              flex: 1,
              child: Center(
                child: Text('Scan a QR code'),
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _onQRViewCreated(QRViewController controller) {
    setState(() {
      _controller = controller;
      _controller.scannedDataStream.listen((scanData) {
        print('Scanned data: ${scanData.code}');
        // Handle the scanned data as desired
      });
    });
  }
}

1. Run the Application: Save the changes, and then run the application using the flutter run command in your terminal or IDE.

This simple app sets up a basic Flutter application with a QR code scanner. It uses the qr_code_scanner package to scan QR codes and displays the scanned data in the console. You can customize the UI and add additional functionality based on your requirements.

Note: Make sure to replace the ^x.x.x in the pubspec.yaml file with the latest version of the qr_code_scanner package.

Feel free to enhance the app’s UI, add error handling, or incorporate other features based on your needs.