actionbar.py

from kivy.base import runTouchApp
from kivy.lang import Builder

runTouchApp(Builder.load_string('''
ActionBar:
    pos_hint: {'top':1}
    btn: btn
    ActionView:
        use_separator: True
        ActionPrevious:
            title: 'Action Bar'
            with_previous: False
        ActionOverflow:
        ActionButton:
            text: 'Btn0'
            icon: 'atlas://data/images/defaulttheme/audio-volume-high'
        ActionButton:
            text: 'Print width'
            on_release: print(btn.width)
        ActionGroup:
        	text: 'Group 1'
        	mode: 'spinner'
	        ActionButton:
	            id: btn
	            text: 'Btn'
	            minimum_width: 500
'''))