Snap2PDF is a modern Android mobile application built using Kotlin and Jetpack Compose. It enables users to scan documents, import images, enhance them using Google ML Kit, and convert them into clean, high-quality PDF files. Designed with a simple and intuitive UI and powered by a reactive MVVM architecture, Snap2PDF delivers fast, smooth, and offline-friendly document processing.
| HomeScreen | Scanning Screen | Preview Screen |
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| SavePDFScreen Screen | Search Screen | SettingsScreen |
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MVVM is a software architectural pattern that separates the presentation layer (View) from the business logic (Model), introducing a ViewModel to manage UI-related data. This design pattern improves maintainability, testability, and scalability of Android applications.
Scan Documents — Capture photos using the camera with auto edges detection and smart cropping
Import Images — Pick multiple images from the gallery for PDF creation
ML Kit Enhancements — Automatic perspective correction, cleanup, and image enhancement
PDF Generation — Convert one or many images into a single high-quality PDF
Reordering & Editing — Modify image order and apply enhancements before export
Local Storage — Save generated PDFs using Room for offline access
Share Files — Share or open PDFs directly from the app
Error/Empty State Handling — Clean UI states for missing files or permission issues
Dark/Light Mode Support — Respects system theme preferences
Tech Stack Layer Tool / Library Language Kotlin UI Toolkit Jetpack Compose Architecture MVVM DI Koin Image Scanning Google ML Kit (Document Scanner & Vision APIs) Local Storage Room (for saved PDFs & history) State Handling StateFlow, Coroutines, ViewModel Navigation Jetpack Compose Navigation Image Loading Coil File Handling Storage Access Framework (SAF) Project Structure com.snap2pdf
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├── data
│ ├── local # Room database, DAOs, entities for saved PDFs
│ ├── model # Models for images, PDFs, processing states
│ └── repository # Repository interface and implementations
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├── di # Koin modules for ViewModels, Repositories, Database
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├── ml
│ ├── scanner # Google ML Kit scanning + preprocessing logic
│ └── utils # Image processing, cropping, enhancement helpers
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├── ui
│ ├── screens
│ │ ├── home # Main home screen
│ │ ├── scan # Capture/import images
│ │ ├── edit # Crop, enhance, reorder images
│ │ ├── preview # Final PDF preview
│ │ └── history # Saved PDFs listing
│ └── components # Reusable Composables (buttons, cards, dialogs)
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├── navigation # Navigation graph and screen routes
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├── utils # Constants, formatters, file helpers, permission utils
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└── MainActivity.kt # App entry point with NavHost