I can't get any further, why my android keyboard doesn't open on my kivy app, I've already tried the following:
self.nummer.is_focusable = True
self.nummer.focus = True
self.nummer.keyboard_mode = 'managed'
keyboard_on_key_down = self.nummer.show_keyboard()
The keyboard opens once at the beginning, but if you push it away and then click on a text input again, it no longer opens, why ???