A handwriting editor built on Android using Jetpack Compose custom touch logic. Inspired by the Goodnotes app, the project supports stylus input, dynamic canvas handling, and a rich user experience for handwritten notes.
Current Status: Actively developed — new features and refactors are being added!
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🏠 Homepage & Navigation (NEW)
- Recently added a structured home screen for managing and accessing notes.
- Seamless navigation between home and editor views.
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📝 Handwriting Input via stylus
- Natural handwriting experience optimized for stylus and finger input.
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🤏 Multi-touch Zoom & Scroll
- Pinch-to-zoom and scroll with finger gestures for a fluid navigation.
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🧽 Erasing by Stroke Intersection
- Erase strokes by intersecting with the eraser tool.
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🔄 Undo/Redo System
- Behavior stack-based undo/redo for all editing actions.
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🖼️ Image Insertion & Caching (NEW)
- Import images into notes with in-app image caching for performance.
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🧩 Dynamic Canvas Expansion
- Canvas automatically grows as you write near the edge, so you never run out of space.
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🎨 Pen Color & Width Selection
- Change pen color and width with intuitive scroll gestures.
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🗃️ Local Database Integration (NEW)
- Built with Room for persistent storage of notes, pages, strokes, and regions.
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🖱️ Virtual Camera Scrolling
- Move "camera" (viewport) over the canvas by moving strokes rather than the screen.
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🖥️ Full Screen Mode
- Toggle full-screen for distraction-free writing.
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🔍 Smooth Scaling and Zooming
- Strokes and objects remain crisp and scale-aware at any zoom level.
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🧩 Modular Architecture (NEW)
- Dependency Injection via Koin, separating concerns for easy testing and scaling.
- Repositories and ViewModels for major domains (Page, Stroke, Region).
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🏗️ Refactored Codebase & Bug Fixes (NEW)
- Major refactors for better maintainability and extensibility.
- Ongoing bug fixes and code improvements.
- Kotlin
- Jetpack Compose (UI)
- Room (Database)
- Koin (DI)
- Coil (Image loading)
- AndroidX Navigation
Tran Minh Viet | UEH | FPTU
University student, aspiring Android engineer.
Built this project to explore real-world gesture handling and advanced canvas logic.
Email: trmviet0801@gmail.com
- Clone the repository:
git clone https://github.com/trmviet0801/GoodNote.git
- Open in Android Studio (Flamingo or later recommended)
- Build & Run on an emulator or physical device (minSdk 24)
Contributions and suggestions are welcome!
Open issues or pull requests for bugs, features, or enhancements.
This project is licensed under the MIT License.
See the LICENSE file for details.
If you find this project helpful or impressive:
- ⭐ Star the repo
- 📬 Reach out for collaboration