tvQuickActions is a button/key mapper developed specially for TV devices. Supports Android TV, Google TV and AOSP on most devices.

It is free version, more features look for in full version

One of main unique features allows you to assign up to 5 actions to the button of your remote and add a lot of useful functions to your device. Even if you don't have a button you don't need, there is a button that is rarely used. And with a double click, you can perform its usual action.

Actions:
* Open app or app’s activity
* Shortcuts & intents
* Keycode
* Open power dialog
* Go home
* Open recents
* Go to previous app
* Open the Voice Assistant (both voice or keyboard interaction)
* Toggle WiFi
* Toggle Bluetooth
* Toggle Play/pause media
* Fast forward/rewind
* Next/previous track
* Open media control panel (with play, pause, stop, next/previous track)
* Take a screenshot (Android 9.0+)
* Open a URL
* Open settings

IMPORTANT!
App uses AccessibilityService API for remap functions.

IMPORTANT!
Some actions may not work on your device. It depends on many factors such as your firmware, Android version etc. Please notify the developer if something goes wrong and refrain from giving the app a poor rating since the issue is often out of the developer's control.