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MDSelectionList properties cannot be modified

I am using an MDSelectionList inside a tab with an MDNavigationRail to switch between screens, however, when I try to customize the MDSelectionList, none of the visual changes apply. I thought that maybe it is a problem with the widget itself but then I separated it and the property changes worked. How can I make the changes apply to the selection list? (I am using kivymd 0.104.2.dev0 from the master branch)
My Code:
from kivy.config import Config
Config.set('graphics', 'width', '850')
Config.set('graphics', 'height', '530')
Config.set('graphics', 'minimum_width', '850')
Config.set('graphics', 'minimum_height', '530')
from kivy.lang import Builder
from kivymd.uix.card import MDCard
from kivymd.uix.tab import MDTabsBase
from kivymd.app import MDApp
class SettingsTab(MDCard, MDTabsBase):
pass
class Example(MDApp):
def __init__(self, **kwargs):
super(Example, self).__init__(**kwargs)
self.kv = Builder.load_string('''
#:kivy 2.0.0
<SettingsTab>:
orientation: "vertical"
size_hint: .95, .95
pos_hint: {"center_x": .5, "center_y": .5}
border_radius: 5
radius: [5]
elevation: 20
BoxLayout:
MDNavigationRail:
color_active: app.theme_cls.primary_color
MDNavigationRailItem:
icon: "list-status"
on_release:
screens.current = "downloads_screen"
MDNavigationRailItem:
icon: "cog"
on_release:
screens.current = "settings"
MDNavigationRailItem:
icon: "information"
on_release:
screens.current = "activity_log"
ScreenManager:
id: screens
Screen:
name: "downloads_screen"
Screen:
name: "activity_log"
Screen:
name: "settings"
MDTabs:
SettingsTab:
title: "DOWNLOAD"
MDSelectionList:
overlay_color: 1, 0, 0, .5
icon_bg_color: 0, 0, 0, 0
icon_check_color: 0, 0, 0, 0
OneLineIconListItem:
text: "Just me!"
IconLeftWidget:
icon: "circle-outline"
pos_hint: {"center_x": .5, "center_y": .5}
OneLineIconListItem:
text: "Just me!"
IconLeftWidget:
icon: "circle-outline"
OneLineIconListItem:
text: "Just me!"
IconLeftWidget:
icon: "circle-outline"
OneLineIconListItem:
text: "Just me!"
IconLeftWidget:
icon: "circle-outline"
SettingsTab:
title: "COLOR"
SettingsTab:
title: "INFO"''')
def build(self):
self.theme_cls.theme_style = "Dark"
self.theme_cls.primary_palette = "Blue"
self.theme_cls.accent_palette = "Teal"
return self.kv
if __name__ == '__main__':
Example().run()

Try something like this.
from kivy.lang import Builder
from kivymd.uix.card import MDCard
from kivymd.uix.tab import MDTabsBase
from kivymd.app import MDApp
kv = ("""
<Check#ILeftBodyTouch+MDCheckbox>:
group: 'group'
size_hint: None, None
size: dp(48), dp(48)
<SettingsTab>:
orientation: "vertical"
size_hint: .95, .95
pos_hint: {"center_x": .5, "center_y": .5}
border_radius: 5
radius: [5,]
elevation: 20
BoxLayout:
MDNavigationRail:
color_active: app.theme_cls.primary_color
MDNavigationRailItem:
icon: "cog"
on_release:
screens.current = "settings"
ScreenManager:
id: screens
Screen:
name: "settings"
MDTabs:
SettingsTab:
title: "DOWNLOAD"
MDList:
spacing: 10
OneLineAvatarIconListItem:
text: "Just me!"
Check:
OneLineAvatarIconListItem:
text: "Just me!"
Check:
OneLineAvatarIconListItem:
text: "Just me!"
Check:
""")
class SettingsTab(MDCard, MDTabsBase):
pass
class Example(MDApp):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.kv = Builder.load_string(kv)
def build(self):
return self.kv
if __name__ == '__main__':
Example().run()

Reference a input box id on kivy screen

I think this problem is easy to solve, but i dont have experience enough to do this.
So, I want to reference the input text (MDTextField on kv file) for the variable "name" that is inside the press() function, so that I can write inside the popup.
I'm learning kivymd for a college project, so, discount the errors and unnecessary informations :/
Here is my kv file
Screen:
id: screen1
NavigationLayout:
id: navigation
ScreenManager:
id: screen_manager
Screen:
id: fact
name: 'fact'
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Menu"
elevation: 10
left_action_items: [['menu', lambda x: nav_drawer.set_state()]]
Widget:
MDLabel:
text: "Fact Checker"
font_size: 56
font_name: "MontserratBold"
pos_hint: {'center_x': 0.75, 'center_y': 0.7}
theme_text_color: "Custom"
text_color: (53/255, 183/255, 1, 1)
MDTextField:
id: input_box
hint_text: "Type here"
font_size: 18
pos_hint: {'center_x': 0.5, 'center_y': 0.45}
size_hint_x: None
width: 500
multiline: True
helper_text: "Type the title of the news"
helper_text_mode: "on_focus"
theme_text_color: "Custom"
text_color: (53/255, 183/255, 1, 1)
line_color_normal: 1, 1, 1, 1
MDRectangleFlatButton:
text: "Check"
pos_hint: {'center_x': 0.5, 'center_y': 0.25}
theme_text_color: "Custom"
text_color: (1, 1, 1, 1)
on_press: app.press()
MDLabel:
markup: True
text: "<Developed by: [color=#cfd0d1]Caio Barreto and Gabriel Queiroz[/color]>"
font_name: "Montserrat"
theme_text_color: "Custom"
text_color: (53/255, 183/255, 1, 0.5)
pos_hint: {'center_x': 0.74, 'center_y': 0.1}
Screen:
name: 'discord'
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Menu"
elevation: 10
left_action_items: [['menu', lambda x: nav_drawer.set_state()]]
Widget:
MDLabel:
text: 'teste1'
Screen:
name: 'add'
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Menu"
elevation: 10
left_action_items: [['menu', lambda x: nav_drawer.set_state()]]
Widget:
MDLabel:
text: 'teste2'
MDNavigationDrawer:
id: nav_drawer
ContentNavigationDrawer:
ScrollView:
DrawerList:
id: md_list
MDList:
OneLineIconListItem:
text: "Menu"
on_press: screen_manager.current = "fact"
IconLeftWidget:
icon: "home"
OneLineIconListItem:
text: "Discord"
on_press: screen_manager.current = "discord"
IconLeftWidget:
icon: "discord"
OneLineIconListItem:
text: "Add more news"
on_press: screen_manager.current = "add"
IconLeftWidget:
icon: "circle-edit-outline"
Here is my python code:
from kivymd.app import MDApp
from kivy.lang.builder import Builder
from kivymd.uix.dialog import MDDialog
from kivymd.uix.textfield import MDTextField
from kivymd.uix.button import MDRectangleFlatButton, MDFlatButton
from kivymd.uix.navigationdrawer import NavigationLayout
from kivymd.uix.list import MDList
from kivymd.uix.boxlayout import BoxLayout
from kivymd.theming import ThemableBehavior
from kivy.core.text import LabelBase
from kivy.uix.widget import Widget
from helper import username_input
from kivymd.uix.screen import Screen
LabelBase.register(name="MontserratBold", fn_regular="font/Montserrat-Bold.ttf")
LabelBase.register(name="Montserrat", fn_regular="font/Montserrat-Medium.ttf")
class FactCheckerApp(MDApp):
class ContentNavigationDrawer(BoxLayout):
pass
class DrawerList(ThemableBehavior, MDList):
pass
def build(self):
self.file = Builder.load_file('projeto.kv')
self.theme_cls.theme_style = "Dark"
self.theme_cls.primary_palette = "LightBlue"
print(self.file.Screen.ids.)
return self.file
def press(self):
name = self.screen1.navigation.screen_manager.fact.input_box.text
close_button = MDFlatButton(text='Close', on_release=self.close_dialog)
self.dialog = MDDialog(title='Answer', text=name, size_hint=(0.5, 1), buttons=[close_button])
self.dialog.open()
def close_dialog(self, obj):
self.dialog.dismiss()
if __name__ == '__main__':
FactCheckerApp().run()

To access the MDTextField, you can just reference it through its id, which is defined in the widget that is the root of the kv rule where the id is defined (in this case, in the Screen). Try changing:
name = self.screen1.navigation.screen_manager.fact.input_box.text
to:
name = self.root.ids.input_box.text
in the press() method.

Multiple screens but self.root.ids retuns an error

This code actually worked until I added multiple screens. It still works when I remove the multi Screen Manager. I get the attrubite error point to Chapter ids
Im trying to add a chapters screen. What Im I doing wrong please.
I think the error is from self.root.ids. I may be wrong. Below is thwe code
Python
from kivymd.app import MDApp
from kivymd.uix.list import OneLineListItem
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.uix.button import MDRectangleFlatIconButton, MDFloatingActionButton
from kivy.lang import Builder
import pygame
pygame.mixer.init()
path = "C://abapp3"
class BooksScreen(Screen):
pass
class ChapterScreen(Screen):
pass
class MainApp(MDApp):
def build(self):
sm = ScreenManager()
sm.add_widget(BooksScreen(name='BooksScreen1'))
sm.add_widget(ChapterScreen(name='ChapterScreen1'))
return sm
def on_start(self):
songs = self.load_songs(path)
pygame.mixer.music.load(songs[0])
def load_songs(self, path_):
songs = []
for filename in os.listdir(path_):
if filename.endswith('.wav'):
songs.append(os.path.join(path_, filename))
self.root.ids.Chapter.add_widget(OneLineListItem(text=filename[2:],
on_release=self.play_song,
pos_hint={"center_x": 1, "center_y": 1}, ))
return songs
#staticmethod
def play_song(*args):
pygame.mixer.music.play()
print(OneLineListItem.text)
#staticmethod
def stop_song(*args):
pygame.mixer.music.stop()
print("song stopped")
MainApp().run()
.KV
ScreenManager:
Screen
BooksScreen:
ChapterScreen:
<BooksScreen>:
NavigationLayout:
ScreenManager:
Screen:
# Front / Main Screen
MDBoxLayout:
orientation: "vertical"
#Toolbar
MDToolbar:
title: "Chapters"
font_style: "Caption"
elevation: 8
left_action_items: [['menu', lambda x: nav_drawer.set_state("open")]]
Widget:
#stop/pause Button
MDBoxLayout:
orientation:"vertical"
# id: StopButton
text:"Pause"
BoxLayout:
Button:
text: 'Goto settings'
on_press:
root.manager.transition.direction = 'left'
root.manager.current = 'ChapterScreen1'
# Chapters list/ Play list
MDScreen
MDBoxLayout:
orientation: "vertical"
MDList
id: Chapter
#Options menu
MDNavigationDrawer:
id: nav_drawer
MDBoxLayout:
orientation: "vertical"
padding: "8dp"
spacing: "8dp"
ScrollView:
# Options Menu Options
MDList:
MDRectangleFlatIconButton:
on_press:
root.ids.nav_drawer.set_state("close")
pos_hint: {"center_x": .5, "center_y": .5}
icon: 'arrow-left'
line_color: 0, 0, 0, 0
OneLineIconListItem:
text: "Options"
font_style: "Caption"
#size_hint_y: None
#height: self.texture_size[1]
# Options Menu- About
OneLineIconListItem:
text: "About"
font_style: "Caption"
# size_hint_y: None
#height: self.texture_size[1]
# Options Menu Storage
OneLineIconListItem
text: 'Storage'
font_style: "Caption"
#IconLeftWidget
#icon: 'tools'
# Options Menu Toolbox
OneLineIconListItem:
text: 'Choose Voice'
font_style: "Caption"
#IconLeftWidget:
# icon: 'toolbox'
# Options Menu About
OneLineIconListItem:
text: 'About'
font_style: "Caption"
# IconLeftWidget:
# icon: 'toolbox-outline'
<ChapterScreen>:
BoxLayout:
Button:
text: 'Back to menu'
on_press:
root.manager.transition.direction = 'right'
root.manager.current = 'BooksScreen1'

The line:
self.root.ids.Chapter.add_widget(OneLineListItem(text=filename[2:],
on_release=self.play_song,
pos_hint={"center_x": 1, "center_y": 1}, ))
is trying to reference the Chapter id as if it were a member of the ScreenManager (root) ids, but it is not. It is a member of the ids of the BookScreen. You can fix that error by referencing the BookScreen instance in the problem line using the get_screen() method of ScreenManager:
self.root.get_screen('BooksScreen1').ids.Chapter.add_widget(OneLineListItem(text=filename[2:],
on_release=self.play_song,
pos_hint={"center_x": 1, "center_y": 1}, ))

How to add an action bar in kivy using screenmanager widget?

I am trying to add an action bar on top in the first screen of my project. I tried using screenmanager widget and sending the action bar as it's children like how to manage/get both of the screens. At first I tried just adding the action bar code in root.widget in the first screen, but they are showing the class for this as an invalid class.
How to add both of them? Also I can't show the buttons from top to bottom even though I added orientation : 'vertical'
import kivy
kivy.require('1.10.1')
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.lang import Builder
from kivy.uix.gridlayout import GridLayout
from kivy.uix.screenmanager import ScreenManager,Screen,FadeTransition
class SomeLayout_GridLayout(Screen):
pass
class FirstScreen(Screen):
pass
class SecondScreen(Screen):
pass
class ScreenManager(ScreenManager):
pass
root_widget = Builder.load_string('''
ScreenManager:
FirstScreen:
SecondScreen:
SomeLayout_GridLayout:
<FirstScreen>:
name: 'first'
<SomeLayout_GridLayout>:
cols: 1
rows: 2
row_force_default: True
rows_minimum: {0: ActionBar.height, 1: self.height - ActionBar.height}
SomeMenu_ActionBar:
id: ActionBar
<SomeMenu_ActionBar#ActionBar>:
ActionView:
id: ActionView
ActionGroup:
id: App_ActionGroup
mode: 'spinner'
text: 'App'
ActionButton:
text: 'Settings'
on_press: app.open_settings()
ActionButton:
text: 'Quit'
on_press: app.get_running_app().stop()
ActionGroup:
id: File_ActionGroup
mode: 'spinner'
text: 'File'
ActionButton:
text: 'Open'
ActionButton:
text: 'Save'
<HiddenIcon_ActionPrevious#ActionPrevious>:
title: app.title if app.title is not None else 'Action Previous'
with_previous: False
app_icon: ''
app_icon_width: 0
app_icon_height: 0
size_hint_x: None
width: len(self.title) * 10
<HiddenText_ActionPrevious#ActionPrevious>: #
with_previous: False
on_press: print(self)
title: ''
<Hidden_ActionPrevious#ActionPrevious>:
with_previous: False
on_press: print(self)
title: ''
size_hint: None, None
size: 0, 0
BoxLayout:
orientation: 'horizontal'
BoxLayout:
Button:
text: 'Crime Prediction'
font_size: 30
on_release: app.root.current = 'second'
Button:
text: 'Forum'
font_size: 30
on_release: app.root.current = 'second'
Button:
text: 'Probable Suspect'
font_size: 30
on_release: app.root.current = 'second'
<SecondScreen>:
name: 'second'
BoxLayout:
orientation: 'vertical'
Label:
text: 'Predict Crime Nigga!'
font_size: 50
BoxLayout:`enter code here`
Button:
text: 'Back to Main Menu'
font_size: 30
on_release: app.root.current = 'first'
Button:
text: 'get random colour screen'
font_size: 30
on_release: app.root.current = 'first'
''')
class ScreenManagerApp(App):
def build(self):
return root_widget
ScreenManagerApp().run()

Kivy App with ActionBar & ScreenManager
Declare a root widget with inheritance of BoxLayout
Add ActionBar as child of root widget
Add ScreenManager as child of root widget, and with id: sm
Snippets
BoxLayout:
orientation: 'vertical'
ActionBar:
...
ScreenManager:
id: sm
FirstScreen:
SecondScreen:
Example
main.py
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
class WelcomeScreen(Screen):
pass
class FirstScreen(Screen):
pass
class SecondScreen(Screen):
pass
class ScreenManager(ScreenManager):
pass
class CrimePrevention(BoxLayout):
pass
Builder.load_file("main.kv")
class TestApp(App):
title = 'Kivy ScreenManager & ActionBar Demo'
def build(self):
return CrimePrevention()
if __name__ == '__main__':
TestApp().run()
main.kv
#:kivy 1.11.0
#:import sp kivy.metrics.sp
#:import dp kivy.metrics.dp
<CrimePrevention>:
orientation: 'vertical'
canvas.before:
Color:
rgb: .6, .6, .6
Rectangle:
pos: self.pos
size: self.size
# source: 'data/background.png'
SomeMenu_ActionBar:
id: ActionBar
ScreenManager:
id: sm
WelcomeScreen:
FirstScreen:
SecondScreen:
<SomeMenu_ActionBar#ActionBar>:
ActionView:
id: ActionView
HiddenIcon_ActionPrevious:
ActionGroup:
id: App_ActionGroup
mode: 'spinner'
text: 'Jump to Screen'
ActionButton:
text: 'Crime Prediction'
on_release: app.root.ids.sm.current = 'second'
ActionButton:
text: 'Forum'
on_release: app.root.ids.sm.current = 'second'
ActionButton:
text: 'Probable Suspect'
on_release: app.root.ids.sm.current = 'second'
ActionGroup:
id: App_ActionGroup
mode: 'spinner'
text: 'App'
ActionButton:
text: 'Settings'
on_press: app.open_settings()
ActionButton:
text: 'Quit'
on_press: app.get_running_app().stop()
ActionGroup:
id: File_ActionGroup
mode: 'spinner'
text: 'File'
ActionButton:
text: 'Open'
ActionButton:
text: 'Save'
<HiddenIcon_ActionPrevious#ActionPrevious>:
title: '' # app.title if app.title is not None else 'Action Previous'
with_previous: False
app_icon: ''
app_icon_width: 0
app_icon_height: 0
size_hint_x: None
width: len(self.title) * 10
<WelcomeScreen>:
name: 'welcome'
Label:
text: 'Welcome Screen'
font_size: sp(50)
<FirstScreen>:
name: 'first'
Label:
text: 'First Screen'
<SecondScreen>:
name: 'second'
BoxLayout:
orientation: 'vertical'
Label:
text: 'Predict Crime'
font_size: 50
BoxLayout:
Button:
text: 'Back to Main Menu'
font_size: 30
on_release: app.root.ids.sm.current = 'first'
Button:
text: 'get random colour screen'
font_size: 30
on_release: app.root.ids.sm.current = 'first'
Output

How should I set a global variable in kivy Python?

My application is simple, the ScreenTwo is showing a form 'Parametreur' with various options to be entered.
What I'm trying to do is to set a 'save' button at the end of this form that will register into a list called 'resultat' all the options furfilled so far leaving '0' in the empty inputs.
The global variable 'resultat' would look like this ['blabla','15/06/2018','31/12/1999','6'].
File.py
from kivy.app import App
from kivy.core.window import Window
from kivy.uix.screenmanager import ScreenManager, Screen, WipeTransition
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.properties import ObjectProperty
from kivy.lang import Builder
Builder.load_file("HadrianRunningApp.kv")
class ScreenMenu(Screen):
pass
class ScreenOne(Screen):
pass
class ScreenTwo(Screen):
pass
class Parametreur(FloatLayout):
def build(self):
pass
def submit_input(self):
# Get the student name from the TextInputs
label_name = self.label_text_input.text
resultat.insert(0,label_name)
def submit_input2(self):
date_debut_name = self.date_debut_input.text
resultat.insert(1,date_debut_name)
def submit_input3(self):
date_fin_name = self.date_fin_input.text
resultat.insert(2,date_fin_name)
def submit_input4(self):
var_duree_estimation = self.duree_estimation_input.text
resultat.insert(3,var_duree_estimation)
def save_input(self):
print(resultat)
class Manager(ScreenManager):
screen_menu = ObjectProperty(None)
screen_one = ObjectProperty(None)
screen_two = ObjectProperty(None)
class ScreensApp(App):
def build(self):
m = Manager(transition=WipeTransition())
return m
if __name__=='__main__':
ScreensApp().run()
The Kivy file .kv:
#:kivy 1.9.0
<ScreenMenu>:
BoxLayout:
orientation:'vertical'
size: root.size
padding: "20dp"
Button:
text: "go to Screen 1"
on_press: root.manager.current = 'screen1'
Button:
text: "go to Screen 2"
on_press: root.manager.current = 'Parametreur'
<ScreenOne>:
BoxLayout:
spacing: 20
padding: 20
Button:
text: "go to Screen 2"
on_press: root.manager.current = 'Parametreur'
Button:
text: "go to Menu"
on_press: root.manager.current = 'screen0'
<ScreenTwo>:
Parametreur
<Parametreur>:
label_text_input: label_text
date_debut_input: date_debut
date_fin_input: date_fin
duree_estimation_input: duree_estimation
resultat: resultat
RelativeLayout:
orientation: 'vertical'
GridLayout:
size_hint: (1., 0.11)
pos_hint: {'right': 1, 'center_y': 0.91}
padding: 6
spacing: "4dp"
cols:2
rows:1
Button:
text: "go to Screen 1"
on_press: root.manager.current = 'screen1'
Button:
text: "go to Menu"
on_press: root.manager.current = 'screen0'
GridLayout:
size_hint: (1., 0.8)
pos_hint: {'right': 1, 'center_y': 0.45}
padding: "7dp"
spacing: 5
cols:2
rows:7
Button:
text: "Liste Actif"
Label:
text: " "
BoxLayout:
Label:
text: "Date du début"
BoxLayout:
orientation: "vertical"
Button:
text: "Submit"
on_press: root.submit_input2()
TextInput:
id: date_debut
text: 'dd/mm/YYYY'
BoxLayout:
Label:
text: "Date de fin"
BoxLayout:
orientation: "vertical"
Button:
text: "Submit"
on_press: root.submit_input3()
TextInput:
id: date_fin
text: 'dd/mm/YYYY'
Label:
text: "Pourcentage de séparation \n de la base (validation/test)"
Button:
text: "Open to Close"
Button:
text: "Close to Close"
Button:
text: "les 3 (6 en tout) frontières des VSs"
BoxLayout:
Label:
text: "Durée pour la réestimation \n des modèles (en jours)"
BoxLayout:
orientation: "vertical"
Button:
text: "Submit"
on_press: root.submit_input4()
TextInput:
id: duree_estimation
text: 'dd/mm/YYYY'
Label:
text: "variable selection NMF/Entropy"
Label:
text: "Kernel/damiers/buntcher/\n neurone/XGBoost/Gradient boosting"
# We create the widgets
BoxLayout:
spacing: "0dp"
Label:
id: label_text
text: "0"
font_size: "30dp"
BoxLayout:
orientation: "vertical"
spacing: "3dp"
Button:
text: "Add"
on_release: label_text.text = str(int(label_text.text) + 1)
Button:
text: "Subtract"
on_release: label_text.text = str(int(label_text.text) - 1)
Button:
text: "Submit"
size_hint_x: None
on_press: root.submit_input()
BoxLayout:
padding: "2dp"
spacing: "2dp"
size_hint: (1., 0.50)
pos_hint: {'right': 1, 'center_y': 0.09}
Button:
id: resultat
text:"Save"
size_hint_x: None
on_press: root.save_input()
<Manager>:
id: screen_manager
screen_menu: screen_menu
screen_one: screen_one
screen_two: screen_two
ScreenMenu:
id: screen_menu
name: 'screen0'
manager: screen_manager
ScreenOne:
id: screen_one
name: 'screen1'
manager: screen_manager
ScreenTwo:
id: screen_two
name: 'Parametreur'
manager: screen_manager
Where and How should I set my global variable 'resultat' (which is a list)?
I've solved my problem but I still don't understand how does it work. Setting a variable is Kivy doesn't need to set it in the Python code. But how do Kivy and Python know about its type? Right now, it works as a list without me defining it such as (I intended it to be a list anyway).
How could I set a variable as tuple for example?