A modern, interactive quiz application built with Flutter, designed to demonstrate Object-Oriented Programming (OOP) principles and best practices in mobile app development.

This Flutter application was developed as a comprehensive teaching tool during a Flutter formation program where I served as the mentor and instructor. I created and designed this app to demonstrate the implementation and efficiency of Object-Oriented Programming principles in organizing a Flutter project, providing my students with a practical, real-world example of professional mobile development practices.

• Demonstrate clean code architecture using OOP principles
• Show efficient project organization and structure
• Implement interactive UI/UX patterns
• Practice state management in Flutter

• Multiple Quiz Categories: Tech, Sports, Math, and more
• Offline Mode: Complete functionality without internet connection
• Interactive UI: Smooth animations and transitions with purple-themed design
• Real-time Feedback: Instant answer validation with visual feedback
• Score Tracking: Track correct and incorrect answers with visual indicators
• Question Progress: Clear progress indication (1/10 format)
• Results Summary: Comprehensive results page with congratulations and performance metrics
• Responsive Design: Optimized for different screen sizes
• Clean Architecture: Domain-driven design with clear separation of concerns

This project demonstrates a Domain-Driven Design (DDD) approach with clean architecture principles and solid OOP implementation:

• Entities: Core business objects (question.dart, quizz.dart, quizz_card.dart)
• Data: Static data sources for offline functionality (quizzCards.dart, quizzes.dart)

• Screens: Main UI screens with navigation logic
• Widgets: Reusable UI components with single responsibility

• Styles: Centralized theming and design system
• Other: Configuration constants and app-wide settings

• Quiz entities encapsulate their data and behavior
• Widgets maintain private state and expose public interfaces
• Data classes hide internal structure while providing clean APIs

• StatefulWidget and StatelessWidget inheritance for UI components
• Common widget behaviors inherited from Flutter's base classes

• Clean separation between data models and presentation logic
• Abstract UI patterns through reusable widget components
• Business logic abstracted from UI implementation

• Each widget has a single, well-defined purpose
• Entities focus solely on data representation
• Clear separation between data, business logic, and presentation

lib/
├── constants/
│   ├── other.dart          # App constants and configurations
│   └── styles.dart         # Theme colors, text styles, and UI constants
├── domain/
│   ├── data/
│   │   ├── quizzCards.dart # Quiz categories data (Tech, Sports, Math)
│   │   └── quizzes.dart    # Quiz questions and answers data
│   └── entity/
│       ├── question.dart   # Question model class
│       ├── quizz.dart      # Quiz model with business logic
│       └── quizz_card.dart # Quiz card model for categories
├── view/presentation/
│   ├── screen/
│   │   ├── home_page.dart       # Main screen with quiz categories
│   │   ├── questions_screen.dart # Quiz gameplay screen
│   │   └── result_screen.dart   # Results and congratulations screen
│   └── widget/
│       ├── how_to_play.dart           # Instructions widget
│       ├── question_screen_header.dart # Header with progress and timer
│       ├── quizz_card.dart           # Category card widget
│       ├── submession_button.dart     # Submit/Next button widget
│       └── suggestion_box.dart        # Answer options widget
└── main.dart               # Application entry point

• Flutter SDK (>=3.0.0)
• Dart SDK (>=3.0.0)
• Android Studio / VS Code
• Android device or emulator

1. Clone the repository

   git clone https://github.com/diaazg/quizz_game.git
   cd quizz_game

2. Install dependencies

   flutter pub get

3. Run the application

   flutter run

1. Select Category: Choose from Tech, Sports, Math, or other available categories
2. Read Instructions: Review the "How to play" section
3. Answer Questions: Select your answer from multiple choice options
4. Track Progress: Monitor your score and remaining questions
5. View Results: See your final score and performance summary

This project serves as an excellent learning resource for:

• Flutter Development: Real-world implementation of Flutter widgets and navigation
• OOP Principles: Practical application of encapsulation, inheritance, and polymorphism
• Code Organization: Structured approach to large-scale Flutter applications
• UI/UX Design: Implementation of Material Design principles
• State Management: Handling application state across different screens

• Add more quiz categories and questions
• Implement local storage for user progress
• Add difficulty levels (Easy, Medium, Hard)
• Include multimedia questions (images, audio)
• Custom quiz creation functionality
• Export results functionality
• Dark/Light theme toggle
• Multiple language support
• Enhanced animations and micro-interactions

Note: This application was developed for educational purposes to demonstrate Flutter development skills and OOP implementation in a real-world project.