What can be remapped?
ONLY HARDWARE buttons can be remapped.
There is NO GUARANTEE any of these buttons will work and this app isn't designed to control games. Your device's OEM/vendor can prevent them from being remapped.
Volume buttons.
Navigation buttons.
Bluetooth/wired keyboards and mice connected to your device.
Buttons on other connected devices should also work.
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 cant 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 cant. 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
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
Move the cursor to the end of a file
Toggle, show and hide the keyboard
Show the keyboard picker (ROOT only for Android 8.1+)
The Key Mapper keyboard needs to be selected for these to work and you cant 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 keyboard to the Key Mapper one and/or show the keyboard picker when a chosen Bluetooth device is connected and switch back to the old one when it is disconnected.
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.
Accessibility Service: Basic requirement for remapping to work. It is needed so the app can listen to and block keyevents.
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
On some devices, enabling the accessibility service will disable "enhanced data encryption".
Source code: https://github.com/sds100/KeyMapper
XDA Thread: https://forum.xda-developers.com/android/apps-games/app-keyboard-button-mapper-t3914005
