📱 DeckPad — Zero-Latency PC Remote Ecosystem

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DeckPad turns your Android smartphone or tablet into a high-precision, zero-latency Multi-Touch Trackpad, an Accounting/Excel Numpad, a Media & PowerPoint Presentation Clicker, and a Virtual PC Keyboard for Windows PCs and laptops.

Unlike typical remote apps, DeckPad requires NO companion server software, NO drivers, and NO third-party background daemons on your computer. It communicates directly at the hardware layer via the native Bluetooth Human Interface Device (HID) standard profile.

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📸 App Screenshots

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✨ Features at a Glance

🖱️ 1. Advanced Multi-Touch Trackpad

• Zero-Latency Hardware Architecture:
  • Delta Coalescing & Off-Main-Thread Dispatch: 120Hz/240Hz screen polling smoothly regulated with high-priority dedicated background thread to eliminate Bluetooth buffer bloat. Zero lag, zero accumulation even over hours of continuous usage.
  • Lightweight R8 Minified Binary: Optimized to ~2.1 MB footprint for ultra-fast load times and minimal memory consumption.
• Precision Gestures & Fine Controls:
  • 1-Finger Move & Tap: Ultra-smooth cursor control and left-click.
  • Double Tap & Drag: Seamless window dragging and text selection (Drag Lock).
  • 2-Finger Scrolling: Smooth vertical and horizontal page navigation (with natural / reverse scroll toggle).
  • 2-Finger Navigation (Back / Forward): Swipe left or right with two fingers to navigate backward (Alt + Left Arrow) or forward (Alt + Right Arrow) in web browsers and Windows File Explorer.
  • 2-Finger Pinch-to-Zoom: Hardware-level Ctrl + Wheel zoom in and out.
  • Pointer Acceleration Toggle: Switch between 1:1 hardware linear mapping and dynamic velocity acceleration (Windows Precision Touchpad style).
  • Tap-to-Click Toggle: Enable or disable tap-based clicking to prevent accidental clicks while navigating.
  • 3-Finger Tap (Configurable): Middle Click (open links in new tab), Windows Search (Win + S), Show Desktop (Win + D), or Action Center (Win + N).
  • 3-Finger Swipes: Task View (Win + Tab swipe up), Show Desktop (Win + D swipe down), and Switch Apps (Alt + Tab / Alt + Shift + Tab swipe left/right).
  • 4-Finger Swipes: Seamlessly slide between Windows virtual desktops (Ctrl + Win + Left/Right).
  • 4-Finger Tap: Quick Notification & Action Center toggle (Win + N).
• Tactile Haptic Engine: Instant vibration feedback on clicks, taps, and multi-finger gestures.
• Distraction-Free Fullscreen Mode: Hide top bars and system UI with wake lock protection for uninterrupted touchpad control.

🔢 2. Productivity Numpad

• Designed for Excel, accounting spreadsheets, data entry, and numeric calculations.
• Standard arithmetic operators (/, *, -, +), NumLk, Del (Backspace), Tab, and Enter.
• Responsive square key grid (aspectRatio(1f)) optimized for phones, foldables, and landscape tablets.

🎵 3. Media Player & Presentation Remote

• Media Controller: Play / Pause, Previous / Next Track, Volume Up / Down, and Mute (native HID Consumer Control).
• PowerPoint & PDF Presentation Clicker:
  • Large, comfortable tactile hit areas for Next Slide and Previous Slide.
  • Start Slideshow (F5), Start from Current Slide (Shift + F5), Black Screen toggle (B), and End Presentation (Esc).

⌨️ 4. Virtual PC Keyboard

• Dual Layout Support: One-tap instantaneous switching between English (US) and Turkish (Q) keyboard layouts. Defaults to English US.
• Full Punctuation & Special Symbols (?123): Dedicated symbol mode containing all standard punctuation and symbols (@, #, $, %, &, *, (, ), [, ], {, }, _, -, +, =, /, \, |, ~, ^, <, >, ", ', :, ;, !, ?, ,, .) with native Windows AltGr / Shift scancode mapping.
• Spacious 6-Key Bottom Row: Ergonomic spacing ([?123] [Ctrl] [Alt] [Space] [Enter] [Win]) eliminating key crowding on mobile screens.
• Smart Modifier Management:
  • Shift: One-shot single tap & double-tap lock (Caps Lock).
  • Sticky Ctrl, Alt, and Win keys for smooth shortcut combinations.
  • Dual-Action Windows Key: Single tap prepares combinations (Win + D, Win + E, Win + R); double tap or long press triggers the native Windows Start Menu.
• PC Shortcut Bar: Instant access to Esc, Tab, Ctrl + C (Copy), Ctrl + V (Paste), Ctrl + Z (Undo), and Ctrl + Alt + Del.

🌐 5. International-Ready & Dynamic Multi-Language

• Default English user interface with secondary Turkish localization.
• Change language on the fly inside Settings without restarting the application.
• Automatically syncs virtual keyboard layout to your selected language while allowing manual overrides.

🔋 6. Persistent Background Connectivity

• Foreground service (HidForegroundService) ensures your Bluetooth connection never drops when switching apps or locking your phone.

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🏗️ Architecture & Technology Stack

Component	Technology
Language	100% Kotlin
UI Framework	Jetpack Compose (Material 3)
Architecture	Clean Architecture + MVVM + Unidirectional Data Flow (UDF)
Reactive State	Kotlin Coroutines & StateFlow
Bluetooth Protocol	Android BluetoothHidDevice API with custom HID descriptor
Dependency Injection	Google Hilt
Local Persistence	Android Jetpack DataStore Preferences
Haptic Feedback	Android Vibration Effect Engine

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🚀 Getting Started

Prerequisites

• Android Studio: Ladybug (2024.2+) or newer.
• JDK: Java 17+ (e.g. Android Studio JBR).
• Device: Android phone or tablet running Android 9.0 (Pie / API 28) or higher with Bluetooth HID device profile enabled by the manufacturer (standard on Samsung, Google Pixel, Xiaomi, OnePlus, etc.).
• Target PC: Windows 10 or Windows 11 with built-in or USB Bluetooth.

📥 Direct APK Download

You can download the pre-compiled, signed Release APK directly from GitHub Releases:

• 🚀 Download DeckPad-v1.2.0.apk (~2.2 MB, R8 minified, signed release)

🛠️ Building from Source

# 1. Clone the repository
git clone https://github.com/ahmetselmancloud/deckpad.git

# 2. Navigate to project root
cd deckpad

# 3. Build Debug APK
./gradlew assembleDebug

# 4. Install onto your connected Android device
./gradlew installDebug

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🔗 Pairing with Windows 10 / 11

1. Open DeckPad on your Android device.
2. Tap the Pair button at the top right to start advertising over Bluetooth.
3. On your Windows PC, go to Settings > Bluetooth & devices > Add device > Bluetooth.
4. Select DeckPad from the list of available devices.
5. Confirm the pairing prompt on both your PC and phone.
6. Once connected, your phone immediately acts as a mouse, keyboard, numpad, and presentation clicker!

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🤝 Contributing

Contributions, issues, and feature requests are welcome! Feel free to check the issues page.

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👤 Author

Ahmet Selman

• GitHub: @ahmetselmancloud

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📄 License

This project is open-source and distributed under the MIT License.