Digital Notepad (v2.0.0)

A modern, high-performance, privacy-first digital notebook for Android built with Jetpack Compose, Kotlin Coroutines & Flow, Room SQLite, and Hardware-backed Biometrics.

🌐 Website & Download: digital-notepad.pages.dev
👨‍💻 Developer: Sohan Ahammed

---

🚀 What's New in Version 2.0.0

1. 📱 Android Home Screen Glance Widgets

• Pinned Sticky Note Widget: Pin any note directly onto your Android home screen for glanceable reading.
• Quick-Add Capture Widget: Instant one-tap button to open quick capture without searching through apps.

2. ☁️ End-to-End Encrypted Cloud Sync (Google Drive / WebDAV)

• Zero-Knowledge Architecture: Export and sync .encbak files encrypted on-device using PBKDF2 (10,000 iterations HMAC-SHA256) and AES-256-GCM.
• Passphrase Protection: Cloud storage providers (Google Drive, WebDAV, Nextcloud, Dropbox) cannot read note content or metadata without your secret master passphrase.

3. 🎨 Rich Media Attachments

• Inline Photo Attachments: Attach photos directly from your camera roll or camera via standard Markdown syntax.
• Voice Memo Recorder & Embedded Player: Record audio notes directly inside notes with live duration visualizer and inline playback controls.
• Finger-Drawing Sketch Canvas: Draw hand sketches and diagrams with custom brush sizes, color swatches, and direct PNG embedding.

4. 🔒 App Lock / Master PIN

• App-wide security layer requiring BiometricPrompt (Fingerprint / Face Unlock) or Device Credential on launch and resume, supplementing the per-note encrypted Vault.

5. 📦 Bulk Import / Export

• Markdown .zip Archive: Batch export all notes as individual .md files organized in a .zip archive.
• Google Keep Import: Effortlessly import Google Keep exported JSON files.
• Standard Text / Markdown Import: Import any .txt or .md file with automatic title and content parsing.
• JSON Full Backup & Restore: Complete database snapshot backup and restore.

6. 🏷️ Tag Tree & Multi-Tagging

• Automatic #hashtag extraction from note title and content (#work, #todo, #ideas).
• Dynamic interactive tag filter chip bar for instant search and categorization.

---

🛠️ Architecture & Tech Stack

• UI: 100% Declarative Jetpack Compose + Material 3 Design Tokens
• Language: Kotlin 2.0+
• Database: Android Room SQLite with reactive Kotlin StateFlow
• Dependency Injection: Dagger Hilt
• Security & Encryption: AndroidKeyStore, PBKDF2WithHmacSHA256, AES-256-GCM
• Hardware Integration: BiometricPrompt, MediaRecorder, MediaPlayer, AppWidgets, Quick Settings Tile

---

📥 Installation

1. Download the latest APK from digital-notepad.pages.dev.
2. Or build locally:

   git clone https://github.com/sohanahamed14/Digital-Notepad.git
   cd Digital-Notepad
   ./gradlew assembleDebug

3. The APK will be located at app/build/outputs/apk/debug/app-debug.apk.

---

🧪 Testing

Run all unit tests:

./gradlew testDebugUnitTest

---

👨‍💻 Author

Sohan Ahammed
Portfolio: sohanahammed14.vercel.app
GitHub: @sohanahamed14