Turn your Android phone into a wireless keyboard, mouse, and media remote for any Bluetooth host. No companion app on the target device.
Linkpad is a Bluetooth HID controller built natively for Android. It pairs with any host that supports Classic Bluetooth — macOS, Windows, Linux, iPadOS, Android TV, and most smart TVs — and shows up as a generic combo keyboard + mouse. The host doesn't need any driver, helper app, or pairing code beyond the standard Bluetooth flow.
Use it as a silent remote for your living-room TV, a backup keyboard when yours dies mid-meeting, or a desk-side trackpad when you want your laptop closed.
- Touchpad — laptop-class trackpad with 1-finger move, 2-finger scroll (vertical + horizontal AC Pan), 2-finger tap right-click, tap-to-drag, and a precision right-edge scroll strip.
- Software keyboard — relays your typing to the host in real time. Optional Shortcuts row (Cmd / Ctrl + C/V/X/Z/A, Alt+Tab), F-keys, Edit cluster (Backspace / Del / Home / End / PgUp / PgDn / Insert), and Arrow cluster.
- Air mouse — gyroscope-driven cursor with low-pass filter. Configurable sensitivity, axis invert, and per-button visibility.
- Media remote — brightness, volume, mute, prev/next track, play/pause, plus 10 s seek for YouTube / Netflix / Spotify / VLC.
- Multi-host profiles — save Mac / PC / iPad / TV profiles, each with its own target-OS layout and last-connected device. Switch in one tap.
- Quick reconnect — one-tap button on the connection bar reconnects to the active profile's last device without scanning.
- Themed UI — light / dark / system theme, smooth tab transitions, premium nav bar.
- Connect anything — combined Classic discovery + BLE scan in parallel; bonded devices pinned to top.
| Touchpad | Keyboard | Air Mouse |
|---|---|---|
| Trackpad surface + edge scroll strip | Live typing relay + chip rows | Gyro cursor visualizer + click row |
| Media | Connect | Settings |
|---|---|---|
| Brightness / volume / transport | Scan + paired history | Profiles, OS, theme, About |
- File → Open and select the project root.
- When prompted "Gradle Wrapper not found", choose OK / Use Gradle from gradle-wrapper.properties.
- Studio downloads everything. Hit Run.
brew install gradle
gradle wrapper --gradle-version 8.6
./gradlew assembleDebug
./gradlew installDebug # installs to a USB-connected device| Command | Output |
|---|---|
./gradlew assembleDebug |
app-debug.apk (com.btremote.app.debug suffix) |
./gradlew assembleRelease |
R8-shrunk signed release APK |
./gradlew bundleRelease |
AAB for Play Store |
./gradlew lint |
Lint report |
./gradlew test |
Unit tests |
- Open Linkpad → Connect tab → tap Scan.
- Pick the device from the list (bonded devices appear first).
- On the host, accept the pairing request (Linkpad shows up as a combo keyboard + mouse named Linkpad).
- Done. Switch back to Touchpad / Keyboard / Media — anything you do is mirrored to the host instantly.
After the first pair, the active profile remembers the device. Tap QUICK on the connection bar next launch — no scan needed.
- macOS 12+
- Windows 10 / 11
- Linux (BlueZ 5.50+)
- iPadOS / iOS 14+
- Android TV / Google TV
- Most smart TVs (LG, Samsung) accept it as a BT keyboard
Not supported: Android phones as the host. Stock and skinned Android (MIUI / One UI / ColorOS) filters out HID-Combo from another phone. Not fixable app-side.
- Kotlin + Jetpack Compose (no XML layouts)
- Hilt dependency injection
- DataStore Preferences (split across app prefs / paired devices / host profiles)
- BluetoothHidDevice API for HID reports
- MVVM with one ViewModel per screen
- Foreground Service owns the HID profile proxy + device connection lifecycle
- Min SDK 28 · Target SDK 34
app/
├── bluetooth/ HID descriptor, report sender, service, scan manager
├── data/ Preferences, paired-device cache, host profiles
├── sensor/ Gyroscope reader for air mouse
└── ui/
├── components/ Connection bar, mouse buttons, sliders, toggles
├── navigation/ Compose nav graph
├── screens/ Touchpad / Keyboard / AirMouse / Media / Connect / Settings
└── theme/ Material3 color, typography
The HID descriptor is a byte-exact combo (Boot Keyboard + 5-button mouse with AC Pan + Consumer control). Mouse polling runs at ~125 Hz to match commercial HID devices. Keyboard input uses 6-key rollover with mutex-guarded slot allocation.
Linkpad never connects to the internet. All Bluetooth traffic is local. Only data stored:
- A list of recently paired devices (name + MAC), kept on-device.
- Your settings (speeds, toggles, theme).
- Host profiles you create.
Nothing leaves your phone.
- Custom keyboard layouts (AZERTY, QWERTZ, Dvorak)
- Macro recorder
- Lock-screen widget for play / pause / skip
- Material You dynamic color
- Optional encrypted cloud sync of profiles
Issues and pull requests welcome. Before submitting:
- Run
./gradlew lintand./gradlew test. - Keep diffs focused — one feature or fix per PR.
- If you touch the HID descriptor, re-pair every test host before retesting (hosts cache the descriptor at bond time).
MIT — see LICENSE.
Devdas Kumar · @Devdas-gupta
If Linkpad saved you a Bluetooth dongle, a star on the repo is appreciated.