How do I close a GameMaker game by pressing the back button on an Android device?

Is there a way to close the game by pressing the back button on an Android device?

I haven't been able to get it to work.

Solution

On mobile devices, the back button is mapped to the keyboard backspace, vk_backspace, which can be used like this:

if (keyboard_check_pressed(vk_backspace)) {
    game_end();
}