How to Create a Drop Down List in Kivy

Below I have provided an example for creating a drop down list in Kivy using ScreenManager. Just as a note, this will work in all layouts, but I find that GridLayout to be the easiest to control. You can copy and paste this into your code.

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder

Builder.load_file("try_out_app.kv")

class ExampleScreen(Screen):
    pass

class RootWidget(ScreenManager):
    pass

class Demo(App):

    def build(self):

        return RootWidget()


if __name__ == "__main__":
    Demo().run()

try_out_app.kv

<ExampleScreen>:
    name: "example_screen"
    GridLayout:
        cols: 1
        padding: 10, 10
        size_hint: 0.5, 0.5
        Button:
            id: btn
            text: "Press me !!"
            size_hint: None, None
            on_parent: drop_content.dismiss()
            on_release: drop_content.open(self)
        DropDown:
            id: drop_content
            on_select: btn.text = f'{args[1]}' # see note below
            Button:
                id: btn1
                text: 'First Item'
                size_hint: None, None
                height: 35
                on_release: drop_content.select('First Item')
            Button:
                id: btn3
                text: 'Second Item'
                size_hint: None, None
                height: 35
                on_release: drop_content.select('Third Item')

<RootWidget>:
    ExampleScreen

args[1] refers to the second element in elements of the DropDown list, in this case each arg is a Button. Therefore args[1] would be the text for each button under the DropDown list.