📸 QR Code Scanner App with Print and Share Functionality

The QR Code Scanner App is a powerful Android application that allows users to:

• Generate QR codes dynamically based on input.
• Customize QR code colors.
• Save, share, and print generated QR codes.
• Pair and unpair with Bluetooth printers for seamless printing.

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🎯 Features

✅ QR Code Generation

• Automatically generates QR codes based on user input.
• Supports real-time generation and updates when text changes.

🎨 Color Customization

• Choose custom colors for the QR code using a color picker.

📸 Save & Share

• Save generated QR codes to the device’s storage.
• Share QR codes via different platforms (Email, Messaging, etc.).

🖨️ Print to Bluetooth Printer

• Connect and print QR codes directly to paired Bluetooth printers.
• Supports unpairing and re-pairing of devices.

💾 Dynamic Size Adjustment

• Resize QR codes dynamically based on user input.

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📚 Table of Contents

• Features
• Installation
• Usage
• Code Structure
• Permissions
• Dependencies
• License

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⚙️ Installation

1. Clone the Repository:

git clone https://github.com/potatoscript/QRCodeScannerApp.git

2. Open Project in Android Studio:

• Open Android Studio.
• Select Open an existing project and navigate to the cloned repository.

3. Build & Run the Project:

• Connect an Android device or start an emulator.
• Click on Run (▶️) to build and launch the app.

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🚀 Usage

1. Generate QR Code

• Enter text in the input field.
• The QR code is generated automatically.

2. Customize QR Code Color

• Click on the Change Color button.
• Select a custom color from the color picker.

3. Save and Share QR Code

• Click the save button to store the QR code as an image.
• Click the share button to send the image using available apps.

4. Print QR Code

• Pair the app with a Bluetooth printer.
• Send the QR code directly to the paired printer.

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📂 Code Structure

/QRCodeScannerApp
├── /app
│   ├── /src
│   │   ├── /main
│   │   │   ├── /java/com/potato/barcodescanner
│   │   │   │   ├── MainActivity.java  // Main activity with menu options
│   │   │   │   ├── QRcodeActivity.java  // Handles QR code generation
│   │   │   │   ├── ColorPickerActivity.java  // Color selection logic
│   │   │   │   └── /utils
│   │   │   │       └── QRCodeUtils.java  // QR code utility methods
│   │   │   ├── /res
│   │   │   │   ├── /layout
│   │   │   │   ├── /drawable
│   │   │   │   └── /values
│   │   └── /AndroidManifest.xml  // App configuration and permissions
├── /gradle
└── build.gradle

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🛡️ Permissions

The following permissions are required:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

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📦 Dependencies

Add the following dependencies in your app/build.gradle:

dependencies {
    implementation 'com.google.zxing:core:3.4.1'  // QR Code generation
    implementation 'com.journeyapps:zxing-android-embedded:4.3.0'  // Barcode scanning
    implementation 'com.github.mazenrashed:Printooth:1.0.6'  // Bluetooth printing
    implementation 'com.squareup.picasso:picasso:2.71828'  // Image loading and caching
}

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📝 Configuration

Bluetooth Printing Setup

To enable Bluetooth printing:

1. Enable Bluetooth on your device.
2. Pair with a compatible Bluetooth printer.
3. Use the pairing option in the app to connect to the printer.

Customizing QR Code Color

• Open ColorPickerActivity.java to modify the default color.
• Adjust r, g, and b values to set custom colors.

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🔥 Troubleshooting

1. Bluetooth Printer Not Found:

   • Ensure Bluetooth is enabled and the printer is in pairing mode.

2. QR Code Not Generating:

   • Verify that text input is not empty.

3. Permission Denied Errors:

   • Ensure that necessary permissions are granted in AndroidManifest.xml.

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🧩 Future Enhancements

✅ Support for Barcode Generation
✅ Add QR Code History
✅ Improve UI/UX with Material Design
✅ Implement Dark Mode

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📜 License

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

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📬 Contact

💡 Developed by PotatoScript
📧 For inquiries, email: contact@potatoscript.dev