Flutter License Manager

A comprehensive Flutter package for managing and displaying OSS (Open Source Software) license information with support for custom licenses and improved UI components.

🌟 Features

  • 📄 Load licenses from Flutter's LicenseRegistry: Automatically collect all licenses from Flutter dependencies
  • 🔧 Add custom licenses: Include licenses for external libraries, DLLs, or other dependencies not covered by Flutter's registry
  • 📝 Multiple license support: Handle packages with multiple license texts as separate strings
  • 🔍 License consolidation: Automatically merges multiple licenses from the same package
  • 🛠️ Text normalization: Properly handles different line ending formats (\r\n, \r, \n)
  • ⚡ Lightweight: Minimal dependencies and efficient data handling

🚀 Getting started

Add this package to your pubspec.yaml:

dependencies:
  flutter_license_manager: ^2.0.1

Then run:

flutter pub get

📖 Usage

Basic Usage - Load from LicenseRegistry

import 'package:flutter_license_manager/flutter_license_manager.dart';

// Load all licenses from Flutter's LicenseRegistry
final licenses = await LicenseService.loadFromLicenseRegistry();

// Display in your UI
ListView.builder(
  itemCount: licenses.length,
  itemBuilder: (context, index) {
    final license = licenses[index];
    return ListTile(
      title: Text(license.packageName),
      subtitle: Text('${license.licenseCount} license(s)'),
      onTap: () {
        // Show license details - see example app for implementation
        _showLicenseDetails(license);
      },
    );
  },
);

Advanced Usage - With Custom Licenses

import 'package:flutter_license_manager/flutter_license_manager.dart';

// Create custom licenses for external dependencies
final customLicenses = [
  LicenseService.createCustomLicense(
    packageName: 'Your Golang DLL',
    licenseText: '''MIT License

Copyright (c) 2024 Your Company

Permission is hereby granted, free of charge, to any person obtaining a copy...''',
  ),
  
  // Add more custom licenses as needed
  LicenseService.createCustomLicense(
    packageName: 'External C++ Library',
    licenseText: 'Your license text here...',
  ),
];

// Load both Flutter registry and custom licenses
final allLicenses = await LicenseService.loadFromLicenseRegistry(
  customLicenses: customLicenses,
);

Working with Multiple License Texts

// Check if a package has multiple licenses
if (license.hasMultipleLicenses) {
  print('${license.packageName} has ${license.licenseCount} licenses');
  
  // Access individual license texts
  for (int i = 0; i < license.licenseTexts.length; i++) {
    print('License ${i + 1}: ${license.licenseTexts[i]}');
  }
}

📚 API Reference

Classes

OssLicenseInfo

Represents license information for a package.

Properties:

  • String packageName: Name of the package
  • List<String> licenseTexts: List of license texts (NEW in v2.0.0)
  • int licenseCount: Number of licenses (automatically calculated)
  • List<String> packageNames: List of package names (for multi-package licenses)
  • bool isMultiplePackages: Whether this contains multiple packages
  • bool hasMultipleLicenses: Whether this package has multiple license texts
  • int packageCount: Number of packages

LicenseService

Main service class for loading and managing licenses.

Methods:

loadFromLicenseRegistry({List<OssLicenseInfo>? customLicenses})

Loads all licenses from Flutter's LicenseRegistry and optionally adds custom licenses.

Parameters:

  • customLicenses (optional): List of custom licenses to include

Returns: Future<List<OssLicenseInfo>>

createCustomLicense({required String packageName, required String licenseText})

Creates a custom license object.

Parameters:

  • packageName: Name of the package
  • licenseText: License text content

Returns: OssLicenseInfo

🔄 Migration from v1.x to v2.x

Breaking Changes

The main breaking change is in the OssLicenseInfo class:

v1.x:

class OssLicenseInfo {
  final String licenseText; // Single text
  // ...
}

// Usage
print(license.licenseText);

v2.x:

class OssLicenseInfo {
  final List<String> licenseTexts; // List of texts
  // ...
}

// Usage
for (final text in license.licenseTexts) {
  print(text);
}

// Or join them if you need a single string
final combinedText = license.licenseTexts.join('\n\n');

📱 Example

The example directory contains a complete implementation showing:

  • Dialog-based license viewing with smooth transitions
  • Multiple license text display with proper separators
  • Custom license integration
  • Desktop-friendly UI design

To run the example:

cd example
flutter run

🎥 Demo

The example app demonstrates:

  1. Home Screen: Choose between basic Flutter licenses or licenses with custom additions
  2. License Dialog: View all licenses in a searchable dialog
  3. Detail View: Smooth transition to individual license details with copy functionality
  4. Multiple Licenses: Proper separation between multiple license texts using Flutter Divider widgets

🐛 Bug Fixes

v2.0.1

  • Fixed license text formatting issues where Carriage Return (\r) characters caused improper text display
  • License texts now properly handle different line ending formats from various sources

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

💖 Support

If you find this package helpful, please give it a ⭐ on GitHub!

For issues and feature requests, please use the issue tracker.

Libraries

flutter_license_manager
A comprehensive Flutter package for managing and collecting OSS license information.