For Bluetooth devices it is in framework-res.apk > res/raw/bt_keypad.json
Code:
{
"keypad": [
{
"keyCodeString": "KEYCODE_F1",
"shortPressAction": "KEYCODE_MENU"
},
{
"keyCodeString": "KEYCODE_F2",
"shortPressAction": "KEYCODE_BACK"
},
{
"keyCodeString": "KEYCODE_F3",
"shortPressAction": "SHOW_DISPLAY_CONTROL_AND_INCREASE_CONTRAST"
},
{
"keyCodeString": "KEYCODE_F4",
"shortPressAction": "REFRESH_SCREEN"
},
{
"keyCodeString": "KEYCODE_F5",
"shortPressAction": "SCREENSHOTS"
},
{
"keyCodeString": "KEYCODE_F6",
"shortPressAction": "TOGGLE_CTM_BRIGHTNESS"
},
{
"keyCodeString": "KEYCODE_F8",
"shortPressAction": "HOME"
},
{
"keyCodeString": "KEYCODE_F9",
"shortPressAction": "SHOW_DISPLAY_CONTROL_DIALOG"
},
{
"keyCodeString": "KEYCODE_F10",
"shortPressAction": "SHOW_REFRESH_MODE_DIALOG"
},
{
"keyCodeString": "KEYCODE_F12",
"shortPressAction": "OPEN_FRONT_LIGHT_DIALOG"
}
]
}