the text inside the mddropdownmenu is not showing up... kivymd

Question

so i have basically copied the code in the documentation but the text is not showing up and the same thing happens in my app too. no idea why

Documentation code:

from kivy.lang import Builder
from kivymd.app import MDApp
from kivymd.uix.menu import MDDropdownMenu

KV = """
#:import toast kivymd.toast.toast

MDScreen:

    MDDropDownItem:
        id: dropdown_item
        text: 'Item 0'
        pos_hint: {'center_x': .5, 'center_y': .6}
        current_item: 'Item 0'
        on_release: app.menu.open()

    MDRaisedButton:
        pos_hint: {'center_x': .5, 'center_y': .3}
        text: 'Check Item'
        on_release: toast(dropdown_item.current_item)
"""


class Example(MDApp):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.screen = Builder.load_string(KV)
        menu_items = [{"text": f"Item {i}"} for i in range(5)]
        self.menu = MDDropdownMenu(
            caller=self.screen.ids.dropdown_item,
            items=menu_items,
            position="center",
            width_mult=4,
        )
        self.menu.bind(on_release=self.set_item)

    def set_item(self, instance_menu, instance_menu_item):
        self.screen.ids.dropdown_item.set_item(instance_menu_item.text)
        instance_menu.dismiss()

    def build(self):
        return self.screen


Example().run()

the output is:

1. the main screen ---> enter image description here
2. after clicking the dropdownitem ---> enter image description here

Answer 1

the MDDropdownMenu use recycle view to present children and so they need to specify the viewclass or the widget type you want to display I just update your code to use OneLineListItem to be MDDropdownMenu children

from kivy.lang import Builder
from kivy.metrics import dp
from kivy.properties import StringProperty

from kivymd.uix.list import OneLineIconListItem
from kivymd.app import MDApp
from kivymd.uix.menu import MDDropdownMenu

KV = '''
<IconListItem>

    IconLeftWidget:
        icon: root.icon


MDScreen

    MDDropDownItem:
        id: drop_item
        pos_hint: {'center_x': .5, 'center_y': .5}
        text: 'Item 0'
        on_release: app.menu.open()
'''


class IconListItem(OneLineIconListItem):
    icon = StringProperty()


class Test(MDApp):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.screen = Builder.load_string(KV)
        menu_items = [
            {
                "viewclass": "IconListItem",
                "icon": "git",
                "text": f"Item {i}",
                "height": dp(56),
                "on_release": lambda x=f"Item {i}": self.set_item(x),
            } for i in range(5)
        ]
        self.menu = MDDropdownMenu(
            caller=self.screen.ids.drop_item,
            items=menu_items,
            position="center",
            width_mult=4,
        )
        self.menu.bind()

    def set_item(self, text_item):
        self.screen.ids.drop_item.set_item(text_item)
        self.menu.dismiss()

    def build(self):
        return self.screen


Test().run()