Button Mapper: Remap your keys 0.50 (nodpi) (Android 4.3+)

Button Mapper makes it easy to map custom actions to your volume buttons, home button, back and recent apps keys. Remap your buttons to launch any app, shortcut or custom action.

Assign custom actions to single presses, double taps and long presses of your phone's hardware buttons. Root is not required.

Button Mapper can remap physical or capacitive keys and buttons, such as volume buttons, the home button on Samsung Galaxy devices, the camera button on Sony devices, and the capacitive home, back and recent apps keys found on many devices by ASUS, HTC, OnePlus, Xiaomi and other manufacturers.

Volume buttons will work with the screen off if your device is rooted. Otherwise, Button Mapper does not work when the screen is off.

This app uses the Device Administrator permission. (BIND_DEVICE_ADMIN)
This permission is used to lock the screen if the "Turn screen off" action is chosen. If you want to remove this permission, open Button Mapper, click on the menu (three dots in the upper right corner) and select "Uninstall"

This app uses Accessibility Service. This is used to detect when the physical or capacitive buttons are pressed on your device so they can be remapped. It is not used to see what you type. Button Mapper respects your privacy and confidentiality. It does not collect or share any of your personal information.

A few examples of keymapping you can do with Button Mapper:
-long press volume down to toggle your flashlight
-double tap your home button to launch your favorite app
-long press your home button to turn off the screen
-double click the back button to see your notifications
-swap your back and recent apps keys
-use your volume buttons to adjust screen brightness
-long press home to toggle "do not disturb" mode
-press and hold the home button to quickly check your lockscreen messages, release to turn off the screen instantly
-and much more, the possibilities are endless

Additional features unlocked in the pro version:
-support for back button, recent apps button and camera button
-Swap volume keys on orientation change
-Default to media volume
-Homescreen lock
-Four themes
-customization of haptic feedback (vibration) on button press and long press

Actions that can be mapped to buttons or keys:
-Launch any app or shortcut
-Disable the button
-Home, back or recent apps
-Last app (may not preserve app state)
-Tasker intents (execute any task in Tasker)
-Turn screen off
-Toggle flashlight
-Quick settings
-Show notifications
-Power dialog
-Take screenshot
-Music: previous track, next track and play/pause
-Adjust volume
-mute volume
-Toggle do not disturb
-Adjust brightness
-Now on tap (requires root)
-Menu button (require root)
-Kill foreground app (requires root)
-Toggle WiFi
-Toggle orientation mode

Buttons supported:
-Home
-Back (PRO version only)
-Recent apps or Menu (PRO version only)
-Volume up
-Volume down
-Bixby button on Samsung S8/S8+
-Camera button (PRO version only)
-Headsethook button
-Custom buttons: add other buttons (active, mute, etc) on your phone, headphones, even gamepads

Additional options:
-change the long press or double tap duration
-delay initial button press for better double tap operation
-disable Button Mapper while using specific apps

Troubleshooting:
-For Bixby on unrooted devices, make sure you don't disable Bixby Voice
-Make sure Button Mapper is exempt from any kind of battery optimization, task killers or other things that may interfere
-Button Mapper does not work with onscreen buttons (such as soft keys or the navigation bar) or the power button.
-Button Mapper does not work while the screen is off, except for the volume buttons if your device is rooted.
-The options shown in the app depend on the buttons available on your phone. Not all phones have home, back and recents buttons!

Support:
Please post on the Button Mapper Google+ community for questions and support:
plus.google.com/communities/103219324831995743794