How to change other kv string's property in kivymd? - list

Question

I was using kivymd MDList, but I have a problem.
My Code:
from kivymd.app import MDApp
from kivy.lang.builder import Builder
example_list = ['a', 'b', 'c']
KV = """
ScrollView:
MDList:
id: List
"""
ListItem = """
OneLineAvatarListItem:
id: item
text: ""
ImageLeftWidget:
source: "icon.png"
"""
class MainApp(MDApp):
def build(self):
return Builder.load_string(KV)
def on_start(self):
for letter in example_list:
self.root.ids.item.text = letter
self.root.ids.List.add_widget(Builder.load_string(ListItem))
MainApp().run()
I want to display List like this, But my code occurs this error:
Traceback (most recent call last):
File "kivy\properties.pyx", line 861, in kivy.properties.ObservableDict.__getattr__
KeyError: 'item'
I think ListItem is not root, but I don't know how to solve this.
How can I change ListItem's text property?

Answer 1

Instead of loading the widget from a kv string, making it in python would be easier for this case, just create the MDList normally and in every iteration of the loop, create a new OneLineAvatarListItem Widget, set its properties, add the image, then add the whole widget to the MDList.
Code
from kivymd.app import MDApp
from kivymd.uix.list import OneLineAvatarListItem, ImageLeftWidget
from kivy.lang.builder import Builder
example_list = ['a', 'b', 'c']
KV = """
ScrollView:
MDList:
id: List
"""
class MainApp(MDApp):
def build(self):
return Builder.load_string(KV)
def on_start(self):
global example_list
for letter in example_list:
one_line = OneLineAvatarListItem(text = letter)
image = ImageLeftWidget(source = "icon.png")
one_line.add_widget(image)
self.root.ids.List.add_widget(one_line)
MainApp().run()