KivyMD 'MDMenuItem' object has no attribute 'text' - python-3.x

Question

I want to click MDMenuItem to get text or do something.
But an error say "AttributeError: 'MDMenuItem' object has no attribute 'text' "
.py file like this
class MDMenuItem(Widget):
pass
class MyScreen(Screen):
menu_items = [
{'viewclass': 'MDMenuItem',
'text': 'text1'},
{'viewclass': 'MDMenuItem',
'text': 'text2'},
]
def change_variable(self, value):
print("\nvalue=", value)
self.VARIABLE = value
print("\tself.VARIABLE=", self.VARIABLE)
.kv file like this:
#:import MDDropdownMenu kivymd.menu.MDDropdownMenu
#:import MDRaisedButton kivymd.button.MDRaisedButton
<MDMenuItem>:
on_release: root.change_variable(self.text)
<MyScreen>:
name: myscrn
MDRaisedButton:
size_hint: None, None
size: 3 * dp(48), dp(48)
text: 'MDButton'
opposite_colors: True
pos_hint: {'center_x': 0.5, 'center_y': 0.5}
on_release: MDDropdownMenu(items=root.menu_items, width_mult=4).open(self)
What should I do?
Edit:
Thank you for your reply. In my case, this .py subprogram not content 'App'. I don't want to put the method into main.py because I want main.py to stay clean.(Just content import, builder.load_file, add_wiget...)
So I want to call method without use 'app.something'.
Can I use root.something or other methods to call change_variable and get text?

Answer 1

I removed class MDMenuItem and change "root.change_variable" to "app.root.get_screen('MyScreen').change_variable". It's work!!!
The "app.root" treated as "screen.manager" in this case. I don't know why but it just work.
.py
class MyScreen(Screen):
menu_items = [
{'viewclass': 'MDMenuItem',
'text': 'text1'},
{'viewclass': 'MDMenuItem',
'text': 'text2'},
]
def change_variable(self, value):
print("\nvalue=", value)
self.VARIABLE = value
print("\tself.VARIABLE=", self.VARIABLE)
.kv
#:import MDDropdownMenu kivymd.menu.MDDropdownMenu
#:import MDRaisedButton kivymd.button.MDRaisedButton
<MDMenuItem>:
on_release: app.root.get_screen("MyScreen").change_variable(self.text)

Answer 2

Note:
The following solution is using KivyMD version 0.1.2.
AttributeError
AttributeError: 'MDMenuItem' object has no attribute 'text'
The error was due wrong definition for class MDMenuItem. It was defined with an inheritance of a Widget which does not has the attribute, 'text'.
Actual Definition of MDMenuItem
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.button import ButtonBehavior
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty
class MDMenuItem(RecycleDataViewBehavior, ButtonBehavior, BoxLayout):
text = StringProperty()
Solution
There is no need to define class MDMenuItem in main.py. Remove it and the program will run.
Example
main.py
from kivy.app import App
from kivymd.theming import ThemeManager
from kivy.uix.screenmanager import Screen
class MyScreen(Screen):
VARIABLE = ""
menu_items = [
{'viewclass': 'MDMenuItem',
'text': 'text1'},
{'viewclass': 'MDMenuItem',
'text': 'text2'},
]
def change_variable(self, value):
print("\nvalue=", value)
self.VARIABLE = value
print("\tself.VARIABLE=", self.VARIABLE)
class MainApp(App):
title = "KivyMD MDDropdownMenu Demo"
theme_cls = ThemeManager()
def build(self):
return MyScreen()
if __name__ == "__main__":
MainApp().run()
main.kv
#:kivy 1.11.0
#:import MDDropdownMenu kivymd.menu.MDDropdownMenu
#:import MDRaisedButton kivymd.button.MDRaisedButton
<MDMenuItem>:
on_release: app.root.change_variable(self.text)
<MyScreen>:
name: 'myscrn'
MDRaisedButton:
size_hint: None, None
size: 3 * dp(48), dp(48)
text: 'MDButton'
opposite_colors: True
pos_hint: {'center_x': 0.5, 'center_y': 0.5}
on_release: MDDropdownMenu(items=root.menu_items, width_mult=4).open(self)
Output