QuickQR

Fast, private, and 100% offline QR code scanner & generator for Android. Built natively using Jetpack Compose.

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QuickQR is a premium, lightweight, and professional-grade QR code scanner, barcode reader, and custom QR generator for Android. Built entirely from scratch with Kotlin and Jetpack Compose, it prioritizes speed, high-quality user experience, and absolute user privacy by working 100% offline with zero advertisements.

✨ Features

• ⚡ Lightning-Fast Scanning — Powered by Google's ML Kit Barcode Scanning API for near-instant QR and barcode detection.
• 🎨 Custom QR Generator — Generate high-quality QR codes in seconds for URLs, Wi-Fi, email, phone numbers, SMS, and plain text.
• 🔒 Privacy First (100% Offline) — The app does not request INTERNET permission. All processing and storage happen locally on your device.
• 📁 Searchable History & Exports — Keep track of your scans with local database storage. Export your history easily to CSV or JSON formats.
• ⚡ Intelligent Context Actions — Open URLs instantly, connect to Wi-Fi networks, send emails/SMS, or call numbers directly from scan results.
• 🎨 Modern Material 3 Design — Full support for system Light/Dark mode, featuring beautiful transitions, responsive layouts, and standard premium buttons.
• 🔋 Zero Bloat & Battery Efficient — No trackers, no background processes, and zero ads to preserve your device performance.

🛠️ Tech Stack

• Language: Kotlin 2.x
• UI Framework: Jetpack Compose (Material 3)
• Scanning API: Google ML Kit Barcode Scanning & CameraX
• Local Storage: Jetpack Room (SQLite) for history, Preferences DataStore for settings
• QR Code Generation: ZXing (Zebra Crossing)
• Platform: Native Android (minSdk 26, targetSdk 36)
• Build System: Kotlin DSL (build.gradle.kts) with R8/ProGuard compiler optimizations

🚀 Getting Started

Prerequisites

• Android Studio (Koala/Ladybug or newer)
• Java Development Kit (JDK) 17 or 21
• Android SDK 36 (Android 16 API level support)

Setup & Installation

1. Clone the repository:

   git clone https://github.com/nicemustafa/quickqr.git
   cd quickqr

2. Open the project in Android Studio.

3. Build the Debug APK:

   ./gradlew assembleDebug

4. Build the Optimized Release APK / App Bundle:

   ./gradlew assembleRelease

   Note: Ensure you configure your signing properties in keystore.properties for production releases.

📦 Project Structure

quickqr/
├── app/
│   ├── proguard-rules.pro        # Comprehensive 100+ line ProGuard ruleset
│   ├── build.gradle.kts          # App-level build configurations & dependencies
│   └── src/main/
│       ├── AndroidManifest.xml   # Target API 35/36 & hardened offline permissions
│       ├── java/net/mustafaer/quickqr/
│       │   ├── data/             # Room Database, DAOs, DataStore repository
│       │   ├── ui/
│       │   │   ├── screens/      # Scanner, Generator, History, Settings Screens
│       │   │   ├── components/   # Unified buttons, bottom sheets, layouts
│       │   │   └── theme/        # Material 3 colors, shapes, typography
│       │   └── MainActivity.kt
│       └── res/                  # Localized strings, backup policies, locales configs
└── build.gradle.kts              # Project-level build configurations

📄 License

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

👤 Author & Studio

Mustafa ER (Founder of MEDEV Studios)

• Website: MEDEV Studios
• Privacy Policy: QuickQR Privacy Policy
• Email: mustafaerpro@gmail.com
• GitHub: @nicemustafa

💖 Support

If you find QuickQR useful, feel free to support:

• ⭐ Star this repository
• ☕ Buy me a coffee
• 🎉 Patreon