carousel.py

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import ObjectProperty
from kivy.lang import Builder
from kivy.uix import actionbar

Builder.load_string('''
<RootWidget>:
    action_bar: _action
    carousel: carousel
    ActionBar:
        id: _action
        size_hint: 1,0.1
        pos_hint: {'top':1}
        ActionView:
            use_separator: True
            ActionPrevious:
                title: 'Slide 1'
                with_previous: False
            ActionOverflow:
                disabled: True
            ActionButton:
                text: 'Go To Slide 2'
                on_release: carousel.index = 1
            ActionButton:
                text: 'Go To Slide 3'
                on_release: carousel.index = 2

    Carousel:
        id: carousel
        pos_hint: {'top': 0.9}
        on_index: root.on_index(*args)
        Button:
            text: 'Slide one'
        Button:
            text: 'Slide Two'
        Button:
            text: 'Slide three'
''')

class RootWidget(FloatLayout):
    cont1 = ObjectProperty(None)
    cont2 = ObjectProperty(None)
    action_bar = ObjectProperty(None)
    carousel = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(RootWidget, self).__init__(**kwargs)
        self.cont1 = actionbar.ContextualActionView(
            action_previous = actionbar.ActionPrevious(title='Go Back'))
        self.cont2 = actionbar.ContextualActionView(
            action_previous = actionbar.ActionPrevious(title='Go Back'))

        self.action_bar.bind(on_previous=self.on_previous)

    def on_index(self, instance, value):
        if value == 2:
            self.action_bar.add_widget(self.cont2)
        elif value == 1:
            self.action_bar.add_widget(self.cont1)
    def on_previous(self, *args):
        self.carousel.load_previous()

class MainApp(App):

    def build(self):
        return RootWidget()
            
if __name__ == '__main__':
    MainApp().run()