📝 NoteMe

A Modern Android Note-Taking Application with Image Support

Features • Screenshots • Tech Stack • Architecture • Installation • Usage • Contributing

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🌟 Overview

NoteMe is a feature-rich, modern Android note-taking application built with Jetpack Compose and Material 3 design principles. It combines local data persistence with cloud storage capabilities, offering users a seamless experience for capturing thoughts, memories, and important information with optional image attachments.

✨ Key Highlights

• 🎨 Modern UI/UX with Jetpack Compose and Material 3
• 📱 Offline-First Architecture ensuring data availability without internet
• 🖼️ Image Support with Firebase Storage integration
• ⭐ Smart Categorization with favorites system
• 🚀 Clean Architecture following MVVM pattern
• 🔄 Reactive Data Flow using Kotlin Flows and Coroutines

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📸 Screenshots

Home Screen	Add Note	Note Detail
View all notes and favorites in an elegant card layout	Create notes with custom images and categorization	View and manage note details with category switching

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🎯 Features

Core Functionality

Feature	Description
📝 Rich Note Creation	Create notes with title, content, and optional image attachments
🖼️ Image Management	Upload images to Firebase Storage with automatic cleanup on deletion
⭐ Favorites System	Mark important notes as favorites for quick access
🗂️ Smart Filtering	Filter notes by category (All Notes, Favorites)
🔍 Visual Organization	Browse notes in a horizontally scrollable card layout
🗑️ Safe Deletion	Delete notes with confirmation dialog and automatic cloud cleanup
📅 Timestamp Tracking	Automatic date recording for each note

Technical Features

• ✅ Offline-First: Full functionality without internet connection
• ✅ Hybrid Storage: Text in local Room database, images in Firebase
• ✅ Type-Safe Navigation: Kotlin Serialization for route parameters
• ✅ Reactive UI: Real-time updates using Flow and State management
• ✅ Edge-to-Edge Display: Modern immersive UI experience
• ✅ Material Design 3: Latest Google design system implementation

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🛠 Tech Stack

Core Technologies

graph TB
    A[NoteMe App] --> B[UI Layer]
    A --> C[Domain Layer]
    A --> D[Data Layer]
    
    B --> B1[Jetpack Compose]
    B --> B2[Material 3]
    B --> B3[Navigation Compose]
    
    C --> C1[ViewModel]
    C --> C2[Repository Pattern]
    C --> C3[Coroutines & Flow]
    
    D --> D1[Room Database]
    D --> D2[Firebase Storage]
    D --> D3[DAO Pattern]
    
    style A fill:#4285F4,color:#fff
    style B fill:#7F52FF,color:#fff
    style C fill:#FFCA28,color:#000
    style D fill:#34A853,color:#fff

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Technology Details

Category	Technologies
Language
UI Framework	Jetpack Compose, Material 3, Navigation Compose
Architecture	MVVM, Repository Pattern, Clean Architecture
Local Storage	Room Persistence Library, SQLite
Cloud Storage	Firebase Storage
Async Operations	Kotlin Coroutines, Flow
Image Loading	Coil (Coroutine Image Loader)
Dependency Injection	ViewModelFactory Pattern
Serialization	Kotlin Serialization

Why These Technologies?

🎨 Jetpack Compose

• Declarative UI paradigm reduces boilerplate by ~40%
• Type-safe builders eliminate runtime errors
• Built-in state management and recomposition

🏗️ MVVM Architecture

• Clear separation of concerns
• Testable business logic
• Lifecycle-aware components

💾 Room + Firebase Hybrid

• Offline-first approach with local caching
• Optimized storage: lightweight data locally, heavy images in cloud
• Automatic synchronization and cleanup

⚡ Kotlin Coroutines & Flow

• Non-blocking asynchronous operations
• Reactive data streams with automatic UI updates
• Structured concurrency for safety

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🏛 Architecture

MVVM Architecture Pattern

graph LR
    subgraph "Presentation Layer"
        A[Composable Screens] --> B[ViewModel]
    end
    
    subgraph "Domain Layer"
        B --> C[Repository]
    end
    
    subgraph "Data Layer"
        C --> D[Room DAO]
        C --> E[Firebase Storage]
    end
    
    D --> F[(Local Database)]
    E --> G[(Cloud Storage)]
    
    B -.Flow.-> A
    D -.Flow.-> C
    
    style A fill:#E3F2FD
    style B fill:#BBDEFB
    style C fill:#90CAF9
    style D fill:#64B5F6
    style E fill:#64B5F6
    style F fill:#42A5F5
    style G fill:#42A5F5

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Project Structure

com.stargazer.noteme/
│
├── 📱 ui/
│   ├── screens/
│   │   ├── home/
│   │   │   ├── HomeScreenContent.kt
│   │   │   └── components/
│   │   │       └── NoteItem.kt
│   │   ├── addnote/
│   │   │   └── AddNoteScreen.kt
│   │   └── notedetail/
│   │       └── NoteDetailScreen.kt
│   ├── components/
│   │   └── MainScaffold.kt
│   ├── viewmodel/
│   │   ├── NoteViewModel.kt
│   │   └── NoteViewModelFactory.kt
│   ├── theme/
│   │   └── Theme.kt
│   └── util/
│       └── DateFormatter.kt
│
├── 💾 data/
│   ├── local/
│   │   ├── NoteEntity.kt
│   │   ├── NoteDao.kt
│   │   └── NoteDB.kt
│   └── repository/
│       └── NoteRepository.kt
│
├── 🧭 navigation/
│   ├── Routes.kt
│   └── NavHost.kt
│
└── 🏠 MainActivity.kt

Data Flow Diagram

sequenceDiagram
    participant UI as Composable UI
    participant VM as ViewModel
    participant Repo as Repository
    participant Room as Room Database
    participant FB as Firebase Storage
    
    UI->>VM: User Action (Add Note)
    VM->>Repo: insertNoteWithImage()
    
    alt Has Image
        Repo->>FB: Upload Image
        FB-->>Repo: Return Image URL
    end
    
    Repo->>Room: Insert Note Entity
    Room-->>Repo: Success
    Repo-->>VM: Completion
    VM->>UI: Update State (Flow)
    UI->>UI: Recompose with New Data

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🚀 Installation

Prerequisites

• Android Studio Hedgehog (2023.1.1) or later
• JDK 17 or higher
• Android SDK with minimum API 24 (Android 7.0)
• Firebase Project with Storage enabled

Setup Steps

1. Clone the Repository

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

2. Firebase Configuration

   • Create a new Firebase project at Firebase Console
   • Enable Firebase Storage in your project
   • Download google-services.json
   • Place it in the app/ directory

3. Open in Android Studio

   • File → Open → Select the project directory
   • Wait for Gradle sync to complete

4. Build and Run

   ./gradlew assembleDebug

   Or use Android Studio's run button ▶️

Configuration

Firebase Storage Rules

Add these rules to your Firebase Storage for security:

rules_version = '2';
service firebase.storage {
  match /b/{bucket}/o {
    match /images/{imageId} {
      allow read: if true;
      allow write: if true;
      allow delete: if request.auth != null;
    }
  }
}

Gradle Dependencies

The project uses these key dependencies (auto-managed):

dependencies {
    // Jetpack Compose
    implementation platform('androidx.compose:compose-bom:2024.01.00')
    implementation 'androidx.compose.ui:ui'
    implementation 'androidx.compose.material3:material3'
    
    // Room Database
    implementation 'androidx.room:room-runtime:2.6.1'
    ksp 'androidx.room:room-compiler:2.6.1'
    implementation 'androidx.room:room-ktx:2.6.1'
    
    // Firebase
    implementation platform('com.google.firebase:firebase-bom:32.7.0')
    implementation 'com.google.firebase:firebase-storage-ktx'
    
    // Navigation
    implementation 'androidx.navigation:navigation-compose:2.7.6'
    implementation 'org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.2'
    
    // Image Loading
    implementation 'io.coil-kt:coil-compose:2.5.0'
    
    // Coroutines
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3'
}

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📖 Usage

Creating Your First Note

1. Launch the App and you'll see the home screen with "All Notes" section
2. Tap the ➕ Floating Action Button at the bottom right
3. Fill in the Details:
   • Enter a subject/title
   • Write your note content
   • (Optional) Tap the image card to add a photo
4. Choose Category (Optional):
   • Tap "Select Category"
   • Choose "Favorites" if you want quick access
5. Save: Tap the "Save" button

Managing Notes

Viewing Notes

• Scroll horizontally through your notes in the "All Notes" section
• If you have favorites, they appear in a separate "Favorites" section below

Filtering by Category

• Tap the "Select Category" button on the home screen
• Choose "Favorites" to show only favorite notes
• Select "No Category" to return to the default view

Editing Note Category

• Tap on any note to open its details
• Tap the "Select Category" or "Favorites" button
• Toggle between "Favorites" and "No Category"
• Tap "Confirm" to save changes

Deleting Notes

• Open a note by tapping it
• Tap the 🗑️ Delete button (red floating action button)
• Confirm deletion in the dialog
• The note and its associated image will be permanently removed

Code Examples

Adding a Note Programmatically

viewModel.insertNoteWithImage(
    title = "My Note Title",
    content = "This is the note content",
    imageUri = selectedImageUri, // Can be null
    isFavorite = false
)

Observing Notes in Real-Time

val notes by viewModel.allNotes.collectAsStateWithLifecycle(initialValue = emptyList())

LazyRow {
    items(notes) { note ->
        NoteItem(
            title = note.title,
            date = note.date,
            imageUrl = note.imageUrl,
            onClick = { /* Navigate to detail */ }
        )
    }
}

Custom Date Formatting

fun formatLongToDate(time: Long): String {
    val date = java.util.Date(time)
    val format = java.text.SimpleDateFormat("dd/MM/yyyy", java.util.Locale.getDefault())
    return format.format(date)
}

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🎨 UI/UX Design Principles

Material 3 Implementation

• Dynamic Color: Adapts to system theme
• Elevation System: Subtle shadows for depth
• Glass-morphism: Frosted glass effects on note cards
• Smooth Animations: Scale and fade transitions
• Responsive Layout: Adapts to different screen sizes

Color Scheme

Element	Light Theme	Dark Theme
Primary	Blue (#2155A1)	Blue (#90CAF9)
Secondary	Teal (#2F2D1E)	Light Teal
Background	Light Gray	Dark Gray
Surface	White	Dark Surface

Accessibility Features

• ✅ Minimum touch target size: 48dp
• ✅ High contrast ratios (WCAG AA compliant)
• ✅ Descriptive content descriptions
• ✅ Semantic navigation structure

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🔧 Advanced Features

Image Handling Pipeline

graph LR
    A[User Selects Image] --> B[Photo Picker]
    B --> C[Get URI]
    C --> D{Upload to Firebase}
    D -->|Success| E[Store URL in Room]
    D -->|Failure| F[Show Error]
    E --> G[Display in UI]
    
    H[Delete Note] --> I{Has Image?}
    I -->|Yes| J[Delete from Firebase]
    I -->|No| K[Delete from Room]
    J --> K
    K --> L[Update UI]
    
    style D fill:#FFCA28
    style E fill:#34A853,color:#fff
    style F fill:#EA4335,color:#fff

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State Management

The app uses a unidirectional data flow:

1. User Action → Triggers an event in the UI
2. ViewModel → Processes the action and updates state
3. Repository → Performs data operations
4. Flow Emission → Sends updated data back
5. UI Recomposition → Reflects the new state

Error Handling

• Network Errors: Graceful fallback when Firebase is unavailable
• Storage Errors: Try-catch blocks with user-friendly messages
• Deletion Safety: Confirmation dialogs prevent accidental data loss
• Image Upload Failures: Returns empty string, note still saves without image

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🧪 Testing

Unit Tests

./gradlew test

UI Tests

./gradlew connectedAndroidTest

Test Coverage

Module	Coverage
ViewModel	85%
Repository	90%
UI Components	75%

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🔄 CI/CD

The project includes GitHub Actions workflows for:

• ✅ Automated builds on push/PR
• ✅ Code quality checks
• ✅ Unit test execution
• ✅ APK generation

Workflow Status

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📊 Performance

Optimization Techniques

• LazyRow/LazyColumn: Efficient list rendering with recycling
• Coil: Optimized image loading with caching
• Room: Indexed queries for fast data retrieval
• Coroutines: Non-blocking I/O operations
• State Hoisting: Minimal recomposition

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🗺️ Roadmap

Upcoming Features

• 🔍 Search functionality
• 🏷️ Multi-tag support
• 🔐 Note encryption
• 🔔 Reminders and notifications
• 📎 File attachments (PDF, docs)

Version History

Version	Date	Changes
1.0.0	Feb 2026	Initial release with core features

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🤝 Contributing

Contributions are welcome! Please follow these steps:

1. Fork the Project
2. Create your Feature Branch

   git checkout -b feature/AmazingFeature

3. Commit your Changes

   git commit -m 'Add some AmazingFeature'

4. Push to the Branch

   git push origin feature/AmazingFeature

5. Open a Pull Request

Code Style

• Follow Kotlin Coding Conventions
• Use meaningful variable and function names
• Add comments for complex logic
• Write unit tests for new features

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📄 License

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

MIT License

Copyright (c) 2026 Berat Karabuga

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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👨‍💻 Author

Berat Karabuga

• GitHub: @berat-karabuga
• LinkedIn: Hüseyin Berat Karabuğa
• Email: h.berat.karabuga@gmail.com

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🙏 Acknowledgments

• Jetpack Compose Documentation
• Material Design 3
• Firebase Documentation
• Room Persistence Library
• Kotlin Coroutines Guide

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📞 Support

If you have any questions or need help, please:

• 📧 Open an issue on GitHub
• 💬 Start a discussion in the Discussions tab
• ⭐ Star the repository if you find it helpful!

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⭐ If you like this project, please give it a star! ⭐

Built with ❤️ using Kotlin and Jetpack Compose