simple_qr_gen 1.0.0 
simple_qr_gen: ^1.0.0 copied to clipboard
A Flutter package for generating customizable QR codes with advanced styling options (colors, logos, shapes) and cross-platform share functionality.
import 'package:flex_color_picker/flex_color_picker.dart';
import 'package:flutter/material.dart';
import 'package:simple_qr_gen/simple_qr_gen.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Simple QR Gen Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(
seedColor: const Color(0xFF6366F1),
brightness: Brightness.dark,
),
useMaterial3: true,
fontFamily: 'SF Pro Display',
),
home: const QrGeneratorPage(),
);
}
}
class QrGeneratorPage extends StatefulWidget {
const QrGeneratorPage({super.key});
@override
State<QrGeneratorPage> createState() => _QrGeneratorPageState();
}
class _QrGeneratorPageState extends State<QrGeneratorPage>
with SingleTickerProviderStateMixin {
final TextEditingController _textController = TextEditingController(
text: 'https://flutter.dev',
);
Color _foregroundColor = const Color(0xFF1E1B4B);
Color _backgroundColor = const Color(0xFFF8FAFC);
QrShape _selectedShape = QrShape.rounded;
final double _qrSize = 280;
bool _isSharing = false;
late AnimationController _animationController;
late Animation<double> _scaleAnimation;
@override
void initState() {
super.initState();
_animationController = AnimationController(
duration: const Duration(milliseconds: 200),
vsync: this,
);
_scaleAnimation = Tween<double>(begin: 1.0, end: 0.95).animate(
CurvedAnimation(parent: _animationController, curve: Curves.easeInOut),
);
}
@override
void dispose() {
_textController.dispose();
_animationController.dispose();
super.dispose();
}
Future<void> _shareQr() async {
setState(() => _isSharing = true);
_animationController.forward().then((_) => _animationController.reverse());
final result = await QrSharer.share(
data: _textController.text,
size: 1024,
style: QrStyle(
foregroundColor: _foregroundColor,
backgroundColor: _backgroundColor,
shape: _selectedShape,
),
fileName: 'qr_code_${DateTime.now().millisecondsSinceEpoch}',
shareText: 'Check out this QR code!',
);
setState(() => _isSharing = false);
if (mounted && !result.success) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Row(
children: [
const Icon(
Icons.error,
color: Colors.redAccent,
),
const SizedBox(width: 12),
Expanded(
child: Text(
result.errorMessage ?? 'Failed to share QR code',
),
),
],
),
behavior: SnackBarBehavior.floating,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
backgroundColor: const Color(0xFF1E1B4B),
),
);
}
}
Future<void> _pickColor(bool isForeground) async {
final currentColor = isForeground ? _foregroundColor : _backgroundColor;
await showDialog(
context: context,
builder: (context) => AlertDialog(
title: Text(
isForeground ? 'Pick Foreground Color' : 'Pick Background Color',
),
content: SingleChildScrollView(
child: ColorPicker(
color: currentColor,
onColorChanged: (color) {
setState(() {
if (isForeground) {
_foregroundColor = color;
} else {
_backgroundColor = color;
}
});
},
pickersEnabled: const {
ColorPickerType.wheel: true,
ColorPickerType.accent: false,
ColorPickerType.primary: false,
},
enableShadesSelection: true,
width: 44,
height: 44,
borderRadius: 22,
),
),
actions: [
TextButton(
onPressed: () => Navigator.pop(context),
child: const Text('Done'),
),
],
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
decoration: const BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topLeft,
end: Alignment.bottomRight,
colors: [
Color(0xFF0F0E1A),
Color(0xFF1E1B4B),
Color(0xFF312E81),
],
),
),
child: SafeArea(
child: SingleChildScrollView(
padding: const EdgeInsets.all(24),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
// Header
const Text(
'Simple QR Gen',
style: TextStyle(
fontSize: 32,
fontWeight: FontWeight.bold,
color: Colors.white,
letterSpacing: -0.5,
),
textAlign: TextAlign.center,
),
const SizedBox(height: 8),
Text(
'Generate beautiful QR codes instantly',
style: TextStyle(
fontSize: 16,
color: Colors.white.withValues(alpha: 0.7),
),
textAlign: TextAlign.center,
),
const SizedBox(height: 40),
// QR Preview Card
Center(
child: AnimatedBuilder(
animation: _scaleAnimation,
builder: (context, child) => Transform.scale(
scale: _scaleAnimation.value,
child: child,
),
child: Container(
padding: const EdgeInsets.all(24),
decoration: BoxDecoration(
color: _backgroundColor,
borderRadius: BorderRadius.circular(24),
boxShadow: [
BoxShadow(
color: _foregroundColor.withValues(alpha: 0.3),
blurRadius: 40,
offset: const Offset(0, 20),
),
],
),
child: SimpleQrGen(
data: _textController.text.isEmpty
? 'https://flutter.dev'
: _textController.text,
size: _qrSize,
style: QrStyle(
foregroundColor: _foregroundColor,
backgroundColor: _backgroundColor,
shape: _selectedShape,
logo: const AssetImage('assets/logo.png'),
errorCorrectionLevel: 2,
),
),
),
),
),
const SizedBox(height: 40),
// Input Section
_buildGlassCard(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text(
'Content',
style: TextStyle(
fontSize: 14,
fontWeight: FontWeight.w600,
color: Colors.white70,
letterSpacing: 0.5,
),
),
const SizedBox(height: 12),
TextField(
controller: _textController,
onChanged: (_) => setState(() {}),
style: const TextStyle(color: Colors.white),
decoration: InputDecoration(
hintText: 'Enter text or URL...',
hintStyle: TextStyle(
color: Colors.white.withValues(alpha: 0.4),
),
filled: true,
fillColor: Colors.white.withValues(alpha: 0.05),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(12),
borderSide: BorderSide.none,
),
prefixIcon: const Icon(
Icons.qr_code_2,
color: Colors.white54,
),
),
),
],
),
),
const SizedBox(height: 20),
// Style Section
_buildGlassCard(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
const Text(
'Style',
style: TextStyle(
fontSize: 14,
fontWeight: FontWeight.w600,
color: Colors.white70,
letterSpacing: 0.5,
),
),
const SizedBox(height: 16),
// Color pickers row
Row(
children: [
Expanded(
child: _buildColorButton(
label: 'Foreground',
color: _foregroundColor,
onTap: () => _pickColor(true),
),
),
const SizedBox(width: 16),
Expanded(
child: _buildColorButton(
label: 'Background',
color: _backgroundColor,
onTap: () => _pickColor(false),
),
),
],
),
const SizedBox(height: 20),
// Shape selector
const Text(
'Shape',
style: TextStyle(
fontSize: 12,
color: Colors.white54,
),
),
const SizedBox(height: 8),
Row(
children: QrShape.values.map((shape) {
final isSelected = shape == _selectedShape;
return Expanded(
child: GestureDetector(
onTap: () => setState(() => _selectedShape = shape),
child: AnimatedContainer(
duration: const Duration(milliseconds: 200),
margin: const EdgeInsets.symmetric(horizontal: 4),
padding: const EdgeInsets.symmetric(
vertical: 12,
horizontal: 8,
),
decoration: BoxDecoration(
color: isSelected
? const Color(0xFF6366F1)
: Colors.white.withValues(alpha: 0.05),
borderRadius: BorderRadius.circular(12),
border: Border.all(
color: isSelected
? const Color(0xFF6366F1)
: Colors.white.withValues(alpha: 0.1),
),
),
child: Column(
children: [
_buildShapeIcon(shape, isSelected),
const SizedBox(height: 4),
Text(
shape.name[0].toUpperCase() +
shape.name.substring(1),
style: TextStyle(
fontSize: 10,
color: isSelected
? Colors.white
: Colors.white54,
fontWeight: isSelected
? FontWeight.w600
: FontWeight.normal,
),
),
],
),
),
),
);
}).toList(),
),
],
),
),
const SizedBox(height: 32),
// Share Button
GestureDetector(
onTap: _isSharing ? null : _shareQr,
child: AnimatedContainer(
duration: const Duration(milliseconds: 200),
padding: const EdgeInsets.symmetric(vertical: 18),
decoration: BoxDecoration(
gradient: const LinearGradient(
colors: [Color(0xFF6366F1), Color(0xFF8B5CF6)],
),
borderRadius: BorderRadius.circular(16),
boxShadow: [
BoxShadow(
color: const Color(0xFF6366F1).withValues(alpha: 0.4),
blurRadius: 20,
offset: const Offset(0, 10),
),
],
),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
if (_isSharing)
const SizedBox(
width: 20,
height: 20,
child: CircularProgressIndicator(
strokeWidth: 2,
valueColor: AlwaysStoppedAnimation(Colors.white),
),
)
else
const Icon(Icons.share_rounded, color: Colors.white),
const SizedBox(width: 12),
Text(
_isSharing ? 'Sharing...' : 'Share QR Code',
style: const TextStyle(
fontSize: 16,
fontWeight: FontWeight.w600,
color: Colors.white,
letterSpacing: 0.3,
),
),
],
),
),
),
const SizedBox(height: 24),
],
),
),
),
),
);
}
Widget _buildGlassCard({required Widget child}) {
return Container(
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
color: Colors.white.withValues(alpha: 0.05),
borderRadius: BorderRadius.circular(20),
border: Border.all(
color: Colors.white.withValues(alpha: 0.1),
),
),
child: child,
);
}
Widget _buildColorButton({
required String label,
required Color color,
required VoidCallback onTap,
}) {
return GestureDetector(
onTap: onTap,
child: Container(
padding: const EdgeInsets.all(12),
decoration: BoxDecoration(
color: Colors.white.withValues(alpha: 0.05),
borderRadius: BorderRadius.circular(12),
border: Border.all(
color: Colors.white.withValues(alpha: 0.1),
),
),
child: Row(
children: [
Container(
width: 32,
height: 32,
decoration: BoxDecoration(
color: color,
borderRadius: BorderRadius.circular(8),
border: Border.all(
color: Colors.white.withValues(alpha: 0.2),
width: 2,
),
),
),
const SizedBox(width: 12),
Text(
label,
style: const TextStyle(
fontSize: 12,
color: Colors.white70,
),
),
],
),
),
);
}
Widget _buildShapeIcon(QrShape shape, bool isSelected) {
final color = isSelected ? Colors.white : Colors.white54;
const size = 20.0;
switch (shape) {
case QrShape.square:
return Container(
width: size,
height: size,
decoration: BoxDecoration(
color: color,
),
);
case QrShape.rounded:
return Container(
width: size,
height: size,
decoration: BoxDecoration(
color: color,
borderRadius: BorderRadius.circular(4),
),
);
case QrShape.dots:
return Container(
width: size * 0.7,
height: size * 0.7,
decoration: BoxDecoration(
color: color,
shape: BoxShape.circle,
),
);
case QrShape.circle:
return Container(
width: size,
height: size,
decoration: BoxDecoration(
color: color,
shape: BoxShape.circle,
),
);
}
}
}Metadata
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likes
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downloads
Publisher
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Weekly Downloads
Metadata
A Flutter package for generating customizable QR codes with advanced styling options (colors, logos, shapes) and cross-platform share functionality.
Repository (GitHub)
View/report issues
Documentation
License
MIT (license)
Dependencies
flutter, image, path_provider, qr, share_plus
