How to exit a Kivy application using a button

Try using App.get_running_app().stop().
For more details, read the Kivy documentation article for the function.

Try using self.root_window.close(). There is bug in new android toolchain.

Use App.stop(*largs):

Button:
    id: btnExit
    text: "Exit"
    on_press: app.stop()

I used

on_press : app.stop()

in Button's property in Kivy Layout File and it worked well for me.

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