What can be remapped?

ONLY HARDWARE buttons can be remapped.

• Volume buttons.
• Navigation buttons.
• Bluetooth/wired keyboards and mice connected to your device.
• Buttons on other connected devices should also work but there is no guarantee.

You can combine multiple keys to form a "trigger" and have as many triggers as you want for each action. You can make a key map only work on a long press as well and to vibrate as well.

What can’t be remapped?

• Pixel Active Edge
• OnePlus Alert Slider
• Power button
• Bixby button

Your key maps don't work if the screen is OFF.

What can I remap my keys to do?

Some actions will only work on rooted devices and specific Android versions.

• Open an app
• Open an app shortcut. This feature is very useful since you can tell another app to do something Key Mapper can’t. E.g If your launcher has a shortcut to open the app drawer you can select that shortcut in this app and make any button open the app drawer.

• Go back
• Go home
• Open recents
• Open menu (ROOT only)
• Expand notification drawer
• Expand quick settings
• Collapse status bar
• Toggle/enable/disable WiFi
• Toggle/enable/disable Bluetooth
• Toggle/enable/disable mobile data (ROOT only)
• Toggle Play/pause media
• Pause/play media
• Fast forward/rewind
• Next/previous track
• Volume up/down
• Increase/decrease a specific volume stream
• Show the volume dialog
• Cycle through and change the ringer mode
• Mute/unmute/toggle mute (Android 6.0+)
• Toggle/enable/disable auto-rotate
• Switch between portrait and landscape mode
• Force portrait/landscape mode
• Toggle/enable/disable auto-brightness
• Increase/decrease brightness
• Toggle/enable/disable flashlight (Android 6.0+)
• Take a screenshot (Android 9.0+)
• Open the Google Assistant
• Open camera
• Consume key event. (Do nothing)
• Lock the device

The Key Mapper input method needs to be selected for these to work and you can’t use a soft keyboard at the same time:
• Input a specific keycode
• Input a key
• Insert a block of text

More will be added. If you have any ideas leave a comment or email the developer. 😃

What other things can the app do?

• Option to show a persistent notification which can pause/resume your keymaps. It can also open the accessibility settings on the device to enable/disable the service. Rooted devices can start/stop the accessibility service without going into settings and just tap the notification.
• Automatically change the input method to the Key Mapper one and/or show the input method picker when a chosen Bluetooth device is connected and switch back to the old one when it is disconnected. (The app NEEDS ROOT access to change the input method automatically)
• Option to show a toast message whenever an action is performed.
• Option to log events and send them to the developer so it is easier to debug issues with the app.

Permisisons

You don't have to grant all the permissions for the app to work. The app will tell you if a permission needs to be granted for a feature to work.

• Device Admin: To turn the screen off when using the action to turn off the screen
• Modify System Settings: To change the brightness and rotation settings
• Camera: To control the flashlight

Planned features

• Double tap to perform an action
• Remap media (i.e volume headset) buttons when the screen is off. Android only allows apps to detect media buttons when the screen is off.
• Action to broadcast an intent with extras.
• Multiple profiles which can be activated and deactivated automatically when a Bluetooth device is connected or when you open an app.
• Integrate the AOSP keyboard into the Key Mapper input method so a soft keyboard can be used at the same time.

Source code: https://github.com/sds100/KeyMapper
Developer contact: [email protected]
XDA Thread: https://forum.xda-developers.com/android/apps-games/app-keyboard-button-mapper-t3914005