lumi_qr_scanner 0.1.0 
lumi_qr_scanner: ^0.1.0 copied to clipboard
A fast and lightweight Flutter plugin for scanning barcodes and QR codes using the device's camera. Supports multiple barcode formats with CameraX/ML Kit on Android and AVFoundation on iOS/macOS.
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:lumi_qr_scanner/lumi_qr_scanner.dart';
import 'package:image_picker/image_picker.dart';
import 'bounding_box_example.dart';
import 'test_qr_scan.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Lumi QR Scanner',
theme: ThemeData(primarySwatch: Colors.blue, useMaterial3: true),
home: const HomePage(),
);
}
}
class HomePage extends StatelessWidget {
const HomePage({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Lumi QR Scanner'),
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
const Icon(Icons.qr_code_scanner, size: 100, color: Colors.blue),
const SizedBox(height: 40),
ElevatedButton.icon(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const ScannerPage()),
);
},
icon: const Icon(Icons.camera_alt),
label: const Text('Scan QR Code with Camera'),
style: ElevatedButton.styleFrom(
padding: const EdgeInsets.symmetric(
horizontal: 24,
vertical: 16,
),
),
),
const SizedBox(height: 16),
ElevatedButton.icon(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => const BoundingBoxExample(),
),
);
},
icon: const Icon(Icons.crop_free),
label: const Text('Bounding Box Example'),
style: ElevatedButton.styleFrom(
padding: const EdgeInsets.symmetric(
horizontal: 24,
vertical: 16,
),
),
),
const SizedBox(height: 16),
ElevatedButton.icon(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => const TestQRScanPage(),
),
);
},
icon: const Icon(Icons.bug_report),
label: const Text('Test QR Scan (Debug)'),
style: ElevatedButton.styleFrom(
padding: const EdgeInsets.symmetric(
horizontal: 24,
vertical: 16,
),
backgroundColor: Colors.orange,
foregroundColor: Colors.white,
),
),
const SizedBox(height: 16),
ElevatedButton.icon(
onPressed: () async {
// Example: Scan QR code from gallery and show alert
final picker = ImagePicker();
try {
final image = await picker.pickImage(
source: ImageSource.gallery,
);
if (image == null) {
debugPrint('No image selected');
return;
}
if (!context.mounted) return;
debugPrint('Image selected: ${image.path}');
// Show loading indicator
showDialog(
context: context,
barrierDismissible: false,
builder:
(context) =>
const Center(child: CircularProgressIndicator()),
);
// Scan the selected image for QR codes
final barcodes = await LumiQrScanner.instance.scanImagePath(
image.path,
);
if (!context.mounted) return;
// Close loading dialog
Navigator.pop(context);
debugPrint('Found ${barcodes.length} barcodes');
if (barcodes.isEmpty) {
// Show detailed error message if no QR code found
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: const Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
children: [
Icon(Icons.error_outline, color: Colors.white),
SizedBox(width: 8),
Text(
'No QR code found in image',
style: TextStyle(fontWeight: FontWeight.bold),
),
],
),
SizedBox(height: 8),
Text(
'Possible reasons:',
style: TextStyle(fontSize: 12),
),
Text(
'• QR code is too small or blurry',
style: TextStyle(fontSize: 11),
),
Text(
'• Poor contrast or lighting',
style: TextStyle(fontSize: 11),
),
Text(
'• QR code is damaged or incomplete',
style: TextStyle(fontSize: 11),
),
Text(
'• Try a different image or angle',
style: TextStyle(fontSize: 11),
),
],
),
backgroundColor: Colors.red.shade700,
duration: const Duration(seconds: 6),
behavior: SnackBarBehavior.floating,
),
);
} else {
// Show alert dialog with detected QR codes
showDialog(
context: context,
builder:
(context) => AlertDialog(
icon: const Icon(
Icons.photo_library,
size: 48,
color: Colors.blue,
),
title: Text(
'Found ${barcodes.length} QR Code${barcodes.length > 1 ? 's' : ''}!',
style: const TextStyle(
fontWeight: FontWeight.bold,
),
),
content: SingleChildScrollView(
child: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children:
barcodes.asMap().entries.map((entry) {
final index = entry.key;
final barcode = entry.value;
return Container(
margin: const EdgeInsets.only(
bottom: 12,
),
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Colors.grey[100],
borderRadius: BorderRadius.circular(
8,
),
border: Border.all(
color: Colors.grey[300]!,
),
),
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: [
if (barcodes.length > 1)
Padding(
padding: const EdgeInsets.only(
bottom: 8,
),
child: Text(
'QR Code ${index + 1}',
style: const TextStyle(
fontWeight: FontWeight.bold,
fontSize: 12,
color: Colors.blue,
),
),
),
SelectableText(
barcode.rawValue ?? 'No value',
style: const TextStyle(
fontSize: 14,
fontFamily: 'monospace',
),
),
const SizedBox(height: 8),
Text(
'Format: ${barcode.format.name.toUpperCase()}',
style: const TextStyle(
fontSize: 11,
color: Colors.grey,
),
),
],
),
);
}).toList(),
),
),
actions: [
FilledButton(
onPressed: () => Navigator.pop(context),
child: const Text('OK'),
),
],
),
);
}
} catch (e, stackTrace) {
debugPrint('Error scanning image: $e');
debugPrint('Stack trace: $stackTrace');
if (context.mounted) {
// Close loading dialog if open
Navigator.of(
context,
rootNavigator: true,
).popUntil((route) => route.isFirst);
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Error: $e'),
backgroundColor: Colors.red,
),
);
}
}
},
icon: const Icon(Icons.photo_library),
label: const Text('Scan QR Code from Gallery'),
style: ElevatedButton.styleFrom(
padding: const EdgeInsets.symmetric(
horizontal: 24,
vertical: 16,
),
),
),
],
),
),
);
}
}
class ScannerPage extends StatefulWidget {
const ScannerPage({super.key});
@override
State<ScannerPage> createState() => _ScannerPageState();
}
class _ScannerPageState extends State<ScannerPage> {
QRScannerController? _controller;
bool _hasPermission = false;
@override
void initState() {
super.initState();
_checkPermission();
SystemChrome.setSystemUIOverlayStyle(
const SystemUiOverlayStyle(
statusBarColor: Colors.transparent,
statusBarIconBrightness: Brightness.light,
statusBarBrightness: Brightness.light,
),
);
}
Future<void> _checkPermission() async {
final hasPermission = await LumiQrScanner.instance.hasCameraPermission();
if (!hasPermission) {
final granted = await LumiQrScanner.instance.requestCameraPermission();
setState(() {
_hasPermission = granted;
});
} else {
setState(() {
_hasPermission = true;
});
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
// appBar: AppBar(
// title: const Text('Scan QR Code'),
// backgroundColor: Colors.black,
// foregroundColor: Colors.white,
// actions: [
// IconButton(
// icon: Icon(_isTorchOn ? Icons.flash_on : Icons.flash_off),
// onPressed: () {
// _controller?.toggleTorch();
// setState(() {
// _isTorchOn = !_isTorchOn;
// });
// },
// ),
// ],
// ),
// extendBodyBehindAppBar: true,
body:
!_hasPermission
? const Center(
child: Text('Camera permission is required to scan QR codes'),
)
: QRScannerView(
config: const ScannerConfig(
formats: [BarcodeFormat.qrCode],
autoFocus: true,
vibrateOnSuccess: true,
autoPauseAfterScan: true,
beepOnSuccess: true,
),
onScannerCreated: (controller) {
_controller = controller;
},
onBarcodeScanned: (barcode) {
setState(() {});
_showResultDialog(barcode);
},
overlayConfig: ScannerOverlayConfig(
title: 'Scan QR Code',
topDescription: 'Position the QR code within the frame',
bottomDescription: 'Keep the code steady for best results',
showBackButton: true,
onBackPressed: () {
Navigator.pop(context);
},
// showToggleTorchButton: true,
onToggleTorch: () {
_controller?.toggleTorch();
},
bottomWidget: Padding(
padding: const EdgeInsets.all(24.0),
child: ElevatedButton.icon(
onPressed: _selectPhotoAndScan,
icon: const Icon(Icons.photo_library),
label: const Text('Select Photo'),
),
),
// borderColor: Colors.green,
// borderWidth: 2.0,
// cornerLength: 30.0,
// scanAreaSize: 0.7,
// showScanLine: true,
// scanLineDirection: ScanLineDirection.vertical,
// scanLineColor: Colors.green,
// scanLineWidth: 2.0,
// scanLineDuration: Duration(milliseconds: 2000),
),
),
);
}
Future<void> _selectPhotoAndScan() async {
final picker = ImagePicker();
try {
final image = await picker.pickImage(source: ImageSource.gallery);
if (image == null) {
debugPrint('No image selected');
return;
}
if (!mounted) return;
debugPrint('Image selected: ${image.path}');
// Show loading indicator
showDialog(
context: context,
barrierDismissible: false,
builder: (context) => const Center(child: CircularProgressIndicator()),
);
// Scan the selected image for QR codes
final barcodes = await LumiQrScanner.instance.scanImagePath(image.path);
if (!mounted) return;
// Close loading dialog
Navigator.pop(context);
debugPrint('Found ${barcodes.length} barcodes');
if (barcodes.isEmpty) {
// Show error message if no QR code found
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: const Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
children: [
Icon(Icons.error_outline, color: Colors.white),
SizedBox(width: 8),
Text(
'No QR code found in image',
style: TextStyle(fontWeight: FontWeight.bold),
),
],
),
SizedBox(height: 8),
Text('Possible reasons:', style: TextStyle(fontSize: 12)),
Text(
'• QR code is too small or blurry',
style: TextStyle(fontSize: 11),
),
Text(
'• Poor contrast or lighting',
style: TextStyle(fontSize: 11),
),
Text(
'• QR code is damaged or incomplete',
style: TextStyle(fontSize: 11),
),
Text(
'• Try a different image or angle',
style: TextStyle(fontSize: 11),
),
],
),
backgroundColor: Colors.red.shade700,
duration: const Duration(seconds: 6),
behavior: SnackBarBehavior.floating,
),
);
} else {
// Show result dialog with first barcode found
_showResultDialog(barcodes.first);
}
} catch (e, stackTrace) {
debugPrint('Error scanning image: $e');
debugPrint('Stack trace: $stackTrace');
if (mounted) {
// Close loading dialog if open
Navigator.of(
context,
rootNavigator: true,
).popUntil((route) => route.isFirst);
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(content: Text('Error: $e'), backgroundColor: Colors.red),
);
}
}
}
void _showResultDialog(Barcode barcode) {
// Example: Show alert dialog when QR code is detected
showDialog(
context: context,
barrierDismissible: false, // User must tap a button to dismiss
builder:
(context) => AlertDialog(
icon: const Icon(Icons.qr_code_2, size: 48, color: Colors.green),
title: const Text(
'QR Code Detected!',
style: TextStyle(fontWeight: FontWeight.bold),
),
content: Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text(
'Content:',
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
),
const SizedBox(height: 8),
Container(
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Colors.grey[100],
borderRadius: BorderRadius.circular(8),
border: Border.all(color: Colors.grey[300]!),
),
child: SelectableText(
barcode.rawValue ?? 'No value',
style: const TextStyle(
fontSize: 14,
fontFamily: 'monospace',
),
),
),
const SizedBox(height: 16),
Row(
children: [
const Icon(
Icons.info_outline,
size: 16,
color: Colors.grey,
),
const SizedBox(width: 8),
Text(
'Format: ${barcode.format.name.toUpperCase()}',
style: const TextStyle(color: Colors.grey, fontSize: 12),
),
],
),
if (barcode.valueType != null) ...[
const SizedBox(height: 8),
Row(
children: [
const Icon(
Icons.category_outlined,
size: 16,
color: Colors.grey,
),
const SizedBox(width: 8),
Text(
'Type: ${barcode.valueType!.type.name}',
style: const TextStyle(
color: Colors.grey,
fontSize: 12,
),
),
],
),
],
],
),
actions: [
OutlinedButton.icon(
onPressed: () {
Navigator.pop(context);
_controller?.resumeScanning();
},
icon: const Icon(Icons.refresh),
label: const Text('Scan Again'),
),
FilledButton.icon(
onPressed: () {
Navigator.pop(context);
Navigator.pop(context);
},
icon: const Icon(Icons.check),
label: const Text('Done'),
),
],
actionsPadding: const EdgeInsets.all(16),
actionsAlignment: MainAxisAlignment.spaceBetween,
),
);
// Alternative examples of showing alerts:
//
// 1. Simple SnackBar (uncomment to use):
// ScaffoldMessenger.of(context).showSnackBar(
// SnackBar(
// content: Text('QR Code: ${barcode.rawValue}'),
// duration: const Duration(seconds: 3),
// action: SnackBarAction(
// label: 'OK',
// onPressed: () {},
// ),
// ),
// );
//
// 2. Bottom Sheet (uncomment to use):
// showModalBottomSheet(
// context: context,
// builder: (context) => Container(
// padding: const EdgeInsets.all(24),
// child: Column(
// mainAxisSize: MainAxisSize.min,
// children: [
// const Icon(Icons.qr_code_scanner, size: 64, color: Colors.blue),
// const SizedBox(height: 16),
// const Text('QR Code Detected!', style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold)),
// const SizedBox(height: 8),
// Text(barcode.rawValue ?? 'No value', textAlign: TextAlign.center),
// const SizedBox(height: 24),
// ElevatedButton(
// onPressed: () => Navigator.pop(context),
// child: const Text('Close'),
// ),
// ],
// ),
// ),
// );
}
@override
void dispose() {
// Khôi phục status bar về mặc định khi rời trang
SystemChrome.setSystemUIOverlayStyle(
const SystemUiOverlayStyle(
statusBarColor: Colors.transparent,
statusBarIconBrightness: Brightness.dark,
statusBarBrightness: Brightness.light,
),
);
_controller?.dispose();
super.dispose();
}
}Metadata
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Metadata
A fast and lightweight Flutter plugin for scanning barcodes and QR codes using the device's camera. Supports multiple barcode formats with CameraX/ML Kit on Android and AVFoundation on iOS/macOS.
Repository (GitHub)
View/report issues
Documentation
License
MIT (license)
Dependencies
flutter, plugin_platform_interface
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