A beautiful, real-time chat application built with Flutter and Firebase that brings people together through seamless messaging.

• Real-time Messaging: Instant message delivery using Firebase Realtime Database
• User Authentication: Secure login and signup with Firebase Auth
• Beautiful UI: Modern gradient design with a dark, elegant theme
• User Discovery: Browse and chat with all registered users
• Persistent Sessions: Stay logged in across app restarts
• Message Timestamps: See when messages were sent with formatted time
• Responsive Design: Optimized for different screen sizes

Login Screen	Signup Screen	Home Screen	Chat Screen

• Frontend: Flutter (Dart)
• Backend: Firebase
  • Firebase Authentication
  • Firebase Realtime Database
• State Management: StatefulWidget
• Local Storage: SharedPreferences
• Date Formatting: intl package

lib/
├── models/
│   ├── chat_model.dart      # Chat message data model
│   └── user_model.dart      # User data model
├── screens/
│   ├── login_screen.dart    # Authentication screen
│   ├── signup_screen.dart   # User registration screen
│   ├── home_screen.dart     # Users list screen
│   └── chat_screen.dart     # Real-time chat interface
├── services/
│   └── firebase_options.dart # Firebase configuration
└── main.dart                # App entry point

• Flutter SDK (>=3.0.0)
• Dart SDK
• Firebase project setup
• Android Studio / VS Code

git clone https://github.com/yourusername/chatify.git
cd chatify

flutter pub get

1. Create a new Firebase project at Firebase Console
2. Enable Authentication (Email/Password)
3. Enable Realtime Database
4. Add your Android/iOS app to the project
5. Download google-services.json (Android) or GoogleService-Info.plist (iOS)
6. Place the configuration files in the appropriate directories

Update lib/services/firebase_options.dart with your Firebase project credentials:

static const FirebaseOptions android = FirebaseOptions(
  apiKey: 'your-api-key',
  appId: 'your-app-id',
  messagingSenderId: 'your-sender-id',
  projectId: 'your-project-id',
  storageBucket: 'your-storage-bucket',
);

flutter run

1. Sign Up: Create a new account with username, email, and password
2. Login: Sign in with your credentials
3. Browse Users: View all registered users on the home screen
4. Start Chatting: Tap on any user to begin a conversation
5. Real-time Messaging: Send and receive messages instantly
6. Logout: Use the logout button to sign out securely

• Secure Firebase Authentication
• Form validation and error handling
• Persistent login sessions using SharedPreferences

• Bidirectional message sync
• Message timestamps with 12-hour format
• Elegant message bubbles with sender/receiver distinction
• Auto-scroll to latest messages

• Stunning gradient backgrounds
• Teal accent color scheme
• Responsive design elements
• Smooth animations and transitions

{
  "users": {
    "userId": {
      "uid": "user_unique_id",
      "email": "[email protected]",
      "username": "display_name"
    }
  }
}

{
  "chats": {
    "senderId-receiverId": {
      "timestamp": {
        "senderId": "sender_uid",
        "receiverId": "receiver_uid",
        "message": "message_text",
        "timestamp": "milliseconds_since_epoch"
      }
    }
  }
}