Kodex – QR Code Scanner & Generator

Fast · Secure · Customizable
A modern QR application built with Jetpack Compose.

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🔍 About

Kodex is a modern QR scanning and generation app focused on customizable and secure QR creation.
Built with Jetpack Compose, providing a smooth UX and beautiful Material 3 design.

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🚀 Core Features

📌 QR Operations

• Generate QR codes for:
  • Text, URLs, Contacts, Email, Wi-Fi, and more
• Scan using camera or images from gallery
• Support for AES-encrypted QR codes
• Save and share generated codes
• Smart Actions — Context-aware one-tap actions available directly from History.

🎨 Customization

• Dynamic Theming (Material You)
• Change QR color & background color
• Add a logo, emoji or image into QR codes
• Customize QR patterns and eye styles
• Optional tags to organize generated QR codes
• 3 customizable widgets (Home Screen)
• Quick Tile (Quick Settings) scanner action
• Startup behavior settings
  • Continue from last screen
  • Always open home screen
  • Open a specific screen on launch

📦 Data & Storage

• Automatic scan history (Room Database)
• Local storage only — works offline
• No personal data tracking

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🛠 Built With

Layer	Technology
UI	Jetpack Compose, Material 3
QR Engine	ZXing
Database	Room + ViewModel
Encryption	AES (CBC/PKCS5Padding)
Widgets	App Widgets + Compose Glance
Analytics	Firebase Analytics & Crashlytics
Language	Kotlin (Compose-first)

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📸 Screenshots

🏠 Home & Themes

Light Mode	Dark Mode

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📡 QR Scanning

Scanner View	Scan Result

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🧾 QR Code Generation

Type Selection	Color & Logo Picker

Create & Share	Create & Share

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📚 History & Saved Codes

History	History

History

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🧩 Architecture

The codebase is organized into distinct, domain-focused layers, clearly separating concerns (Presentation, Domain, and Data):

Directory Name	Layer Responsibility	Description
presentation/	Presentation Layer	Houses all UI components, ViewModels, and Compose UI screens.
data/	Data Layer	Manages interactions with all data sources (local/remote). Contains Room Entities and DAO (Data Access Objects).
domain/	Domain Layer	Contains the core business logic of the application. Defines Models and Use Cases for business rules.
widgets/	Specialized Components	Holds components outside the main application flow, specifically application Widgets built using Glance.
features/	Feature Modules	Contains feature-specific modules, such as QR Code Generation and Scanning functionality.

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🔐 Privacy & Security

Kodex collects no personal data.
All operations run locally on your device, including encrypted QR creation.

✔ Offline
✔ Secure AES Encryption
✔ Local Database Only

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🛣️ Roadmap

• 🟦 Gradient QR colors & backgrounds

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📩 Contact

Created by Mahmut Alperen Ünal

• 🔗 GitHub: github.com/mahmutaunal
• 📨 Email: mahmutalperenunal@gmail.com

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📌 Note

This repository is a technical showcase only.
Source code of Kodex is private.