🚀 Major Improvements #

Singleton Pattern Implementation

• BREAKING CHANGE: Replaced ComprehensiveNotificationManager.create() with ComprehensiveNotificationManager.getInstance()
• Notification Duplication Fix: Implemented singleton pattern to prevent multiple instances from causing duplicate notifications
• Thread-Safe Initialization: Added proper thread-safe initialization with Completer to handle concurrent calls
• Defensive Programming: Automatic prevention of notification duplication even if developers accidentally try to create multiple instances

Enhanced Architecture

• Memory Optimization: Improved resource management with singleton pattern
• Stream Safety: Enhanced stream controller management with proper disposal
• Instance Lifecycle: Better control over instance creation and disposal

🐛 Bug Fixes #

• Duplicate Notifications: Fixed issue where Firebase foreground messages were being displayed twice when navigating between different screens
• Stream Controller Errors: Resolved "Cannot add new events after calling close" errors in Firebase repository
• Background Message Handling: Improved background message processing to prevent stream duplication

📈 Performance Improvements #

• Single Instance: Reduced memory footprint by ensuring only one notification manager instance exists
• Efficient Initialization: Optimized initialization process with proper caching
• Resource Management: Better cleanup and resource disposal

🔄 Migration Guide #

Breaking Changes

Old way (deprecated):

final manager = await ComprehensiveNotificationManager.create();

New way:

final manager = await ComprehensiveNotificationManager.getInstance();

Automatic Benefits

• No Code Changes Required: If you pass the manager instance between screens, no changes needed
• Prevents Duplication: Automatically prevents notification duplication issues
• Better Performance: Improved memory usage and initialization speed

🛡️ Safety Improvements #

• Error Prevention: Proactive prevention of common developer mistakes
• Logging: Enhanced debug logging for better troubleshooting
• Stability: More reliable notification handling across app lifecycle

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🎉 Initial Release #

This is the first stable release of the Flutter Notification Manager package, providing comprehensive notification management for Flutter applications across all platforms.

✨ Features #

Core Functionality

• Unified Interface: Single API for both Firebase Cloud Messaging (FCM) and local notifications
• Cross-Platform Support: Full support for Android, iOS, Web, Windows, macOS, and Linux
• Type Safety: Complete type safety throughout the implementation with proper error handling
• Initialization Management: Robust initialization system with proper resource cleanup

Notification Management

• Local Notifications: Complete local notification support using flutter_local_notifications
• Firebase Notifications: Full FCM integration with token management and background handling
• Notification Templates: Pre-built templates for common notification types:
  • Basic notifications
  • Rich media notifications with images
  • Interactive notifications with action buttons
  • Message-style notifications
  • Reminder notifications
  • Promotional notifications
  • Progress notifications
  • Critical alerts

Scheduling & Timing

• Timezone-Aware Scheduling: Advanced scheduling with proper timezone handling
• Recurring Notifications: Support for daily, weekly, monthly recurring patterns
• Quiet Hours: Automatic notification scheduling around user-defined quiet hours
• Background Scheduling: Reliable scheduling even when app is backgrounded

Permission Management

• Comprehensive Permissions: Handle all notification-related permissions
• Platform-Specific Handling:
  • Android 13+ POST_NOTIFICATIONS permission
  • Android 12+ exact alarm permissions
  • iOS provisional authorization
  • Critical alerts support
• Permission Debugging: Detailed permission status checking and debugging tools
• Automatic Retries: Configurable permission request retries with user guidance

User Preferences

• Preference Management: Comprehensive user preference system
• Quiet Hours Settings: Configurable quiet hours with weekday-only options
• Sound & Vibration Control: Per-user sound and vibration preferences
• Blocked Senders: Support for blocking specific notification sources
• Category Preferences: Fine-grained control over notification categories

Rich Features

• Rich Media: Support for images, large icons, and custom styling
• Interactive Actions: Notification action buttons with user input support
• Reply Actions: Direct reply functionality for message notifications
• Channel Management: Create and manage notification channels (Android)
• Delivery Tracking: Monitor notification delivery status (Firebase only)
• Background Handling: Proper background notification processing

Error Handling

• Comprehensive Error Types: Specific error types for different failure scenarios:
  • Initialization errors
  • Permission errors
  • Delivery errors
  • Scheduling errors
  • Platform-specific errors
• Graceful Degradation: Automatic fallback strategies when services fail
• Debug Support: Extensive logging and debugging capabilities

🔧 Technical Implementation #

Architecture

• Clean Architecture: Proper separation of concerns with domain, data, and presentation layers
• Repository Pattern: Unified repository interface for different notification sources
• Singleton Pattern: Efficient resource management with singleton instances
• Stream-Based Events: Reactive programming with stream controllers for events

Platform Integration

• Android:
  • Notification channels with automatic creation
  • Battery optimization handling
  • Exact alarm permissions for Android 12+
  • Background notification handling
• iOS:
  • Provisional authorization support
  • Critical alerts capability
  • Rich media attachments
  • Background refresh integration
• Web:
  • Firebase-only notification support
  • Service worker integration
  • HTTPS requirement handling
• Desktop:
  • Native system notification integration
  • Focus assist respect
  • Cross-platform desktop support

Dependencies

• firebase_core: ^3.14.0 - Firebase core functionality
• firebase_messaging: ^15.2.7 - Firebase Cloud Messaging
• flutter_local_notifications: ^19.3.0 - Local notifications
• timezone: ^0.10.1 - Timezone handling
• flutter_shared_utilities: ^1.0.9 - Utility functions
• async: ^2.13.0 - Async utilities

📱 Platform Support #

Platform	Local Notifications	Firebase Notifications	Scheduling	Rich Media
Android	✅	✅	✅	✅
iOS	✅	✅	✅	✅
Web	❌	✅	❌	✅
Windows	✅	❌	✅	✅
macOS	✅	❌	✅	✅
Linux	✅	❌	✅	✅

🎯 Example Integration #

// Initialize the notification manager
final notificationManager = await ComprehensiveNotificationManager.create();

// Set up user preferences
final preferences = UserPreferencesModel(
  quietHours: QuietHoursSettings(
    enabled: true,
    startTime: '22:00',
    endTime: '08:00',
  ),
);

// Initialize with preferences
await notificationManager.initialize(userPreferences: preferences);

// Show a notification
final payload = notificationManager.templates.createBasicNotification(
  id: 'welcome',
  title: 'Welcome!',
  body: 'Your notification system is ready.',
);

await notificationManager.showNotification(payload);

🧪 Testing Support #

• Unit Tests: Comprehensive test coverage for core functionality
• Widget Tests: Testing utilities for Flutter widget integration
• Integration Tests: Full end-to-end testing support
• Mock Support: Proper mocking capabilities for testing environments

📚 Documentation #

• Comprehensive README: Detailed setup and usage instructions
• API Documentation: Complete API reference with examples
• Platform Guides: Platform-specific setup and configuration guides
• Troubleshooting: Common issues and solutions
• Migration Guide: For users coming from other notification packages

🚀 Performance #

• Lazy Loading: Efficient resource loading with lazy initialization
• Memory Management: Proper cleanup and resource disposal
• Background Efficiency: Optimized background processing
• Stream Management: Efficient stream controller management

🔒 Security #

• Permission Validation: Proper permission checking and validation
• Data Sanitization: Safe handling of notification payloads
• Background Security: Secure background notification processing
• Token Management: Secure Firebase token handling

💎 Quality Assurance #

• Lint Rules: Comprehensive linting with custom Flutter lint rules
• Code Coverage: High test coverage across all modules
• Static Analysis: Advanced static code analysis
• Documentation Coverage: Complete documentation for all public APIs

---

This initial release provides a solid foundation for notification management in Flutter applications. The package is designed to be production-ready with comprehensive error handling, extensive platform support, and flexible configuration options.

For detailed usage instructions, please refer to the README.md file and the API documentation.

Support & Contributing #

• Issues: GitHub Issues
• Discussions: GitHub Discussions
• Contributing: See Contributing Guidelines