USB Keyboard Android App

An Android application that turns your Android device into a USB keyboard using USB Host mode.

Features

• USB HID keyboard emulation
• Virtual keyboard interface
• Support for modifier keys (Shift, Ctrl, Alt)
• Power-efficient operation
• Secure device verification
• Error handling and user feedback

Requirements

• Android device with USB Host mode support
• Android 7.0 (API level 24) or higher
• USB OTG cable
• Windows 10+ host computer

Installation

1. Clone the repository:

git clone https://github.com/yourusername/usb-keyboard.git

2. Open the project in Android Studio

3. Build and install the app:

./gradlew installDebug

Usage

1. Connect your Android device to a PC using a USB OTG cable
2. Launch the USB Keyboard app
3. Grant USB permissions when prompted
4. Use the virtual keyboard to type on the connected PC

Architecture

The app follows a modular architecture with these main components:

• MainActivity: UI and user interaction handling
• UsbConnectionManager: USB device communication
• HidDescriptor: USB HID protocol implementation
• KeyboardReportGenerator: HID report generation
• SecurityManager: Device verification and security
• PowerManager: Power optimization
• ErrorHandler: Error management and user feedback

Security Features

• Device whitelisting
• Vendor verification
• Security risk assessment
• Encrypted communication
• Android Keystore integration

Power Optimization

• Wake lock management
• Buffer reuse
• Inactivity detection
• Screen state management

Contributing

1. Fork the repository
2. Create a feature branch
3. Commit your changes
4. Push to the branch
5. Create a Pull Request

License

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