We Keep Coding

Either the class "FourthWindow" doesn't show stacklayout or its the only thing on the screen

from kivy.app import App
from kivy.graphics import Line
from kivy.metrics import dp
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.dropdown import DropDown
from kivy.uix.relativelayout import RelativeLayout
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.scrollview import ScrollView
from kivy.uix.stacklayout import StackLayout
from kivy.uix.widget import Widget
from kivy.lang import Builder
from kivymd.app import MDApp
class ScrollViewExample(ScrollView):
pass
class FirstWindow(Screen):
def set_text(self):
my_title_input = self.ids.note_title
my_details = self.ids.note_details
fo = open("notes.txt", "a")
fo.write('\n'+'\n'+my_title_input.text)
fo.write('\n'+my_details.text)
fo.close()
class SecondWindow(Screen):
pass
class ThirdWindow(Screen):
def on_toggle_button_state(self):
dark_mode = self.ids.dark_mode
dark_mode.text = 'Feature not available'
pass
class FourthWindow(Screen):
#This class displays notes from a file in buttons
#works but only the notes showup
def build(self):
root = FourthWindow()
root.add_widget(FourthWindow(name='StackLayout'))
class StackLayoutExample(StackLayout):
class ScrollView(ScrollView):
pass
def __init__(self, **kwargs):
super().__init__(**kwargs)
layout = StackLayout(orientation='lr-tb')
with open('notes.txt', 'r') as fp:
data = fp.read()
splat = data.split("\n\n")
notes = []
for i, note in enumerate(splat, 0):
notes.append(note)
for i in range(0, len(notes)):
b = Button(text=notes[i], size_hint=(.25, .4))
self.add_widget(b)
class WindowManager(ScreenManager):
pass
class RelativeLayoutExample(RelativeLayout):
pass
class ScreeManager(ScreenManager):
pass
class LineMaker(Widget):
pass
class Noteit(App):
pass
Noteit().run()
Noteit.kv <---The kv file begins here
WindowManager:
FirstWindow:
SecondWindow:
ThirdWindow:
FourthWindow:
<FirstWindow>:
id: first_window
name: "Notes"
RelativeLayout:
Label:
text: "Notes"
size_hint: None,None
pos_hint: {'top':1,'center_x':.5}
font_size: 35
Button:
text: 'Account'
size_hint: None,None
pos_hint: {'top':1,'right':1}
on_release:
app.root.current = "Account"
root.manager.transition.direction= "left"
Button:
text: 'Preferences'
size_hint: None,None
pos_hint: {'top':1,'left':1}
on_release:
app.root.current = "Preferences"
root.manager.transition.direction= "right"
Label:
text: "Title:"
size_hint: None,None
pos_hint: {'top':.85,'center_x':.5}
font_size: 20
TextInput:
id: note_title
size_hint: .45,.08
pos_hint: {'top':.75,'center_x':.5}
multiline: False
Label:
text: "Details:"
size_hint: None,None
pos_hint: {'top':.65,'center_x':.5}
font_size: 20
TextInput:
id: note_details
size_hint: .45,.3
pos_hint: {'top':.55,'center_x':.5}
multiline: True
Button:
text: "Submit"
size_hint: .25,.1
length: "100dp"
pos_hint: {'top':.25,'center_x':.5}
on_release:
root.set_text()
LineMaker:
canvas:
Color:
rgba: 1, 1, 1, 1
Line:
width: 2.
points: (self.width,self.height*.83,0,self.height*.83)
Button:
text: 'View All Notes'
size_hint:.25,.15
pos_hint: {'bottom':1,'center_x':.5}
on_release:
app.root.current = "View"
root.manager.transition.direction= "up"
<SecondWindow>:
name: "Account"
RelativeLayout:
Label:
text: "Account"
size_hint: None,None
pos_hint: {'top':1,'center_x':.5}
font_size: 35
Button:
text: 'Notes'
size_hint: None,None
pos_hint: {'top':1,'left':1}
on_release:
app.root.current = "Notes"
root.manager.transition.direction= "right"
Button:
text: 'Preferences'
size_hint: None,None
pos_hint: {'top':1,'right':1}
on_release:
app.root.current = "Preferences"
root.manager.transition.direction= "left"
Label:
text: "Username:"
size_hint: None,None
pos_hint: {'top':.85}
font_size: 20
TextInput:
size_hint: .5,.1
pos_hint: {'top':.55,'left':.3}
multiline: False
Label:
text: "Password:"
size_hint: None,None
pos_hint: {'top':.65}
font_size: 20
TextInput:
size_hint: .5,.1
pos_hint: {'top':.75,'left':.3}
multiline: False
Button:
text: "Log In"
size_hint: .25,.1
length: "100dp"
pos_hint: {'top':.45}
Button:
text: "Sign Up"
size_hint: .25,.1
length: "100dp"
pos_hint: {'top':.45,'center_x':.375}
LineMaker:
canvas:
Color:
rgba: 1, 1, 1, 1
Line:
width: 2.
points: (self.width,self.height*.83,0,self.height*.83)
<ThirdWindow>:
name: "Preferences"
RelativeLayout:
Label:
text: "Preferences"
size_hint: None,None
pos_hint: {'top':1,'center_x':.5}
font_size: 35
Button:
text: 'Notes'
size_hint: None,None
pos_hint: {'top':1,'right':1}
on_release:
app.root.current = "Notes"
root.manager.transition.direction= "left"
Button:
text: 'Account'
size_hint: None,None
pos_hint: {'top':1,'left':1}
on_release:
app.root.current = "Account"
root.manager.transition.direction= "right"
ToggleButton:
text: 'Dark Mode'
size_hint: .25,.1
pos_hint: {'top':.75,'center_x':.25}
on_state: root.on_toggle_button_state()
Label:
id: dark_mode
text: ''
LineMaker:
canvas:
Color:
rgba: 1, 1, 1, 1
Line:
width: 2.
points: (self.width,self.height*.83,0,self.height*.83)
<FourthWindow>:
name: "View"
RelativeLayout:
Button:
text: 'Note Submission'
size_hint:.25,.15
pos_hint: {'top':1,'center_x':.5}
on_release:
app.root.current = "Notes"
root.manager.transition.direction= "down"
Label:
text: 'All Notes'
size_hint: None,None
pos_hint: {'top':1,'right':.9}
font_size: 35
How do I make the stacklayout code showup with the kv file code? Or at least make the stacklayout part of the screen.
Right now the only option I have is either take the screen as output or the stack layout as output.
Replacing the def build(self) inside the class FourthWindow(Screen) will show the whole application. The code inside the def build(self) also works but they do not work together.
I am new to kivy and object oriented programming so I do not know much about this topic so I could be missing something really basic.

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.

How to get user input from an MDTextField in KivyMD

Please I keep getting an attribute error when I try to get the text a user input into an MDTextField, tried everything I could think of, researched and couldn't get anything. Please I need your help.
I try to get the text with this argument of self.root.ids.MyId.text
This is the error I get:
File "C:/Users/user/Documents/KmD/Webma/main_webma.py", line 120, in login
email_addr = self.root.ids.email.text
File "kivy\properties.pyx", line 864, in kivy.properties.ObservableDict.__getattr__
AttributeError: 'super' object has no attribute '__getattr__'
And this is my main.py code
from kivymd.app import MDApp
from kivy.clock import Clock
from kivy.lang import Builder
from home_page_strings import toolbar
import sqlite3
from kivy.uix.screenmanager import Screen, ScreenManager
from kivymd.uix.picker import MDThemePicker
from kivy.uix.popup import Popup
from kivymd.uix.textfield import MDTextField
# calling of screen classes and addition to the screen_manager
class Friend1(Screen):
pass
class WelcomeScreen(Screen):
def __init__(self, **kwargs):
super(WelcomeScreen, self).__init__(**kwargs)
Clock.schedule_once(self.callNext, 5)
def callNext(self, dt):
self.manager.current = 'account'
class AccountScreen(Screen):
pass
class HomeScreen(Screen):
pass
class RoomScreen(Screen):
pass
class ContactsScreen(Screen):
pass
class CallsScreen(Screen):
pass
class SettingsScreen(Screen):
pass
class FaqScreen(Screen):
pass
class InviteScreen(Screen):
pass
manager = ScreenManager()
manager.add_widget(Friend1(name='friend1'))
manager.add_widget(HomeScreen(name='home'))
manager.add_widget(WelcomeScreen(name='welcome'))
manager.add_widget(RoomScreen(name='room'))
manager.add_widget(ContactsScreen(name='contacts'))
manager.add_widget(CallsScreen(name='calls'))
manager.add_widget(SettingsScreen(name='settings'))
manager.add_widget(FaqScreen(name='faq'))
manager.add_widget(InviteScreen(name='invite'))
manager.add_widget(AccountScreen(name='account'))
# end of call of screen classes and addition to screenmanager
class EMC_WebmaApp(MDApp):
def __init__(self, **kwargs):
super().__init__(**kwargs)
# -------------------------- CODE FOR THE DATABASE ---------------------------------- #
conn = sqlite3.connect('webma_database.db')
cursor = conn.cursor()
# cursor.execute('''CREATE TABLE users (
# email text,
# password integer
# )''')
def sign_up(self, cursor):
cursor.execute('INSERT INTO users VALUES('', '')')
conn.commit()
conn.close()
# -------------------------- END OF CODE FOR THE DATABASE ---------------------------------- #
# BUILDER FUNCTION AND SCREEN
def build(self):
screen = Screen()
# theme settings
self.theme_cls.primary_palette = 'DeepPurple'
self.theme_cls.theme_style = 'Dark'
# end of theme declaration
# loaded strings
navigation_bar = Builder.load_string(toolbar)
# end of loaded strings
# addition of loaded strings to screen + return screen
screen.add_widget(navigation_bar)
return screen
# end of addition
# END OF BUILDER FUNCTION
# USER VALIDATION FUNCTION
def login(self):
email_addr = self.root.ids.email.text
if email_addr == str(''):
print('Invalid Email Address')
# END OF USER VALIDATION
def change(self, dt):
self.root.manager.current = 'home'
# App theme manager
def change_theme(self):
picker = MDThemePicker()
picker.open()
# End of app theme manager
# home page search bar
def search_bar(self, dt):
searchbar = Popup(
title='Search',
content=MDTextField(
helper_text='Input values to be searched for',
helper_text_mode='on_focus'
),
auto_dismiss=True,
# size_hint=(None, None),
# size=(400, 98)
size_hint=(0.7, 0.17),
pos_hint={'center_x': 0.5, 'center_y': 0.8}
)
searchbar.open()
# APP RUN
if __name__ == '__main__':
EMC_WebmaApp().run()
# WELL... THIS IS THE END OF EVERYTHING
Then my string code where I try to get my text from
toolbar = '''
ScreenManager:
WelcomeScreen:
HomeScreen:
RoomScreen:
ContactsScreen
CallsScreen:
SettingsScreen:
FaqScreen:
InviteScreen:
AccountScreen:
Friend1:
<WelcomeScreen>:
name: 'welcome'
Image:
source: 'logo.png'
size_hint: 0.4, 0.4
pos_hint: {'center_x': 0.5, 'center_y':0.6}
MDLabel:
text: 'Webma'
halign: 'center'
font_style: 'H3'
color: (1, 1, 1, 1)
pos_hint: {'center_x': 0.5, 'center_y':0.8}
MDLabel:
text: 'Powered by emc_codes'
halign: 'center'
bold: 'True'
italic: True
pos_hint: {'center_x': 0.5, 'center_y':0.1}
<HomeScreen>:
name: 'home'
NavigationLayout:
ScreenManager:
Screen:
BoxLayout:
orientation: 'vertical'
spacing: '8dp'
MDToolbar:
title: 'EMC_Webma'
left_action_items: [['menu', lambda x: navigation.set_state('open')]]
right_action_items: [['card-search', app.search_bar]]
elevation: 10
ScrollView:
MDList:
TwoLineAvatarIconListItem:
text: 'Friend 1'
ImageLeftWidget:
source: 'einstein.jpg'
IconRightWidget:
icon: 'dots-vertical'
MDNavigationDrawer:
id: navigation
BoxLayout:
orientation: 'vertical'
spacing: '8dp'
padding: '8dp'
Image:
source: 'einstein.jpg'
MDLabel:
text: 'Enwerem Melvin Confidence'
font_style: 'Subtitle2'
size_hint_y: None
height: self.texture_size[1]
MDLabel:
text: 'enweremmelvinconfidence#gmail.com'
font_style: 'Caption'
size_hint_y: None
height: self.texture_size[1]
ScrollView:
MDList:
OneLineIconListItem:
text: 'Room'
on_release: root.manager.current = 'room'
IconLeftWidget:
icon: 'theater'
on_release: root.manager.current = 'room'
OneLineIconListItem:
text: 'Contacts'
on_release: root.manager.current = 'contacts'
IconLeftWidget:
icon: 'contacts'
on_release: root.manager.current = 'contacts'
OneLineIconListItem:
text: 'Calls'
on_release: root.manager.current = 'calls'
IconLeftWidget:
icon: 'cellphone-android'
on_release: root.manager.current = 'calls'
OneLineIconListItem:
text: 'Settings'
on_release: root.manager.current = 'settings'
IconLeftWidget:
icon: 'settings'
on_release: root.manager.current = 'settings'
OneLineIconListItem:
text: 'FAQ'
on_release: root.manager.current = 'faq'
IconLeftWidget:
icon: 'frequently-asked-questions'
on_release: root.manager.current = 'faq'
OneLineIconListItem:
text: 'Invite Friends'
on_release: root.manager.current = 'invite'
IconLeftWidget:
icon: 'account-plus'
on_release: root.manager.current = 'invite'
OneLineIconListItem:
text: 'Theme Manager'
on_release:
app.change_theme()
IconLeftWidget:
icon: 'theme-light-dark'
<RoomScreen>:
name: 'room'
MDLabel:
text: 'Welcome to the Room Screen'
halign: 'center'
bold: True
font_size: 50
MDIconButton:
icon: 'keyboard-backspace'
pos_hint: {'center_x': 0.06, 'center_y': 0.96}
on_release: root.manager.current = 'home'
size_hint: None, None
<ContactsScreen>:
name: 'contacts'
MDLabel:
text: 'Welcome to the Contacts Screen'
halign: 'center'
bold: True
font_size: 50
MDIconButton:
icon: 'keyboard-backspace'
pos_hint: {'center_x': 0.06, 'center_y': 0.96}
on_release: root.manager.current = 'home'
size_hint: None, None
<CallsScreen>:
name: 'calls'
MDLabel:
text: 'Welcome to the Calls Screen'
halign: 'center'
bold: True
font_size: 50
MDIconButton:
icon: 'keyboard-backspace'
pos_hint: {'center_x': 0.06, 'center_y': 0.96}
on_release: root.manager.current = 'home'
size_hint: None, None
<SettingsScreen>:
name: 'settings'
MDLabel:
text: 'Welcome to the Settings Screen'
halign: 'center'
bold: True
font_size: 50
MDIconButton:
icon: 'keyboard-backspace'
pos_hint: {'center_x': 0.06, 'center_y': 0.96}
on_release: root.manager.current = 'home'
size_hint: None, None
<FaqScreen>:
name: 'faq'
MDLabel:
text: 'Welcome to the Faq Screen'
halign: 'center'
bold: True
font_size: 50
MDIconButton:
icon: 'keyboard-backspace'
pos_hint: {'center_x': 0.06, 'center_y': 0.96}
on_release: root.manager.current = 'home'
size_hint: None, None
<InviteScreen>:
name: 'invite'
MDLabel:
text: 'Welcome to the Invite Screen'
halign: 'center'
bold: True
font_size: 50
MDIconButton:
icon: 'keyboard-backspace'
pos_hint: {'center_x': 0.06, 'center_y': 0.96}
on_release: root.manager.current = 'home'
size_hint: None, None
<AccountScreen>:
name: 'account'
BoxLayout:
MDLabel:
text: 'Account Login'
pos_hint: {'center_x': 0.6, 'center_y': 0.9}
color: (1, 1, 1, 1)
font_size: 40
MDTextFieldRound:
id: email
hint_text: 'Email Address'
icon_right: 'email'
icon_right_color: app.theme_cls.primary_color
pos_hint: {'center_x': 0.5, 'center_y': 0.7}
size_hint_x: None
width: 300
MDTextFieldRound:
id: password
hint_text: 'Enter Password'
icon_right: 'lock'
icon_right_color: app.theme_cls.primary_color
password: True
pos_hint: {'center_x': 0.5, 'center_y': 0.5}
size_hint_x: None
width: 300
MDRaisedButton:
text: 'Login'
md_bg_color: app.theme_cls.primary_color
pos_hint: {'center_x': 0.5, 'center_y': 0.2}
on_release: app.login() # root.manager.current = 'home'
<Friend1>
name: 'friend1'
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: 'Friend 1'
left_action_items: [['keyboard-backspace', app.change]]
right_action_items: [['phone', lambda x: print('go ahead and make a call')], ['video', lambda x: print('Video')], ['dots-vertical', lambda x: print('dots')]]
MDLabel:
text: 'This is a test screen for our Chat'
halign: 'center'
'''
Please guys I really appreciate the help. Thanks in advance...

The email id only appears in the ids for the AccountScreen. Any id appearing in a kv gets inserted into the ids of the widget that is the root of the rule that contains the id. So, you must access the AccountScreen instance to get to the email id:
# BUILDER FUNCTION AND SCREEN
def build(self):
screen = Screen()
# theme settings
self.theme_cls.primary_palette = 'DeepPurple'
self.theme_cls.theme_style = 'Dark'
# end of theme declaration
# loaded strings
self.navigation_bar = Builder.load_string(toolbar) # save a reference to the loaded ScreenManager
# end of loaded strings
# addition of loaded strings to screen + return screen
screen.add_widget(self.navigation_bar)
return screen
# end of addition
# END OF BUILDER FUNCTION
# USER VALIDATION FUNCTION
def login(self):
# use the saved reference to access the email address
email_addr = self.navigation_bar.get_screen('account').ids.email.text
if email_addr == str(''):
print('Invalid Email Address')
# END OF USER VALIDATION

value = self.root.get_screen('nameofscreen').ids.username.text
print("What you typed is: ", value)
syntax = self.root.get_screen('name').ids.id.text

How do I use a variable for the text in an MDLabel?

I'm trying to put the username that I input from an MDTextField into a MDLabel text. In my case, the MDLabel is in a MDNavigationDrawer that comes after the user presses the submit button and goes to the next screen.
All I could think of so far is declaring usn as a string property in the submit screen:
class SubmitScreen(Screen):
usn = StringProperty()
then created a method to set usn to the input of the MDTextfield in my app:
def getname(self):
usn = (self.root.get_screen("menu").ids.userdata.text)
then I set the text in my MDLabel to root.usn
MDLabel:
text: root.usn
font_style: 'Subtitle1'
size_hint_y:None
height: self.texture_size[1]
When I go to the next screen, MDLabel is blank. It doesn't give me an error but it doesn't show what I typed in the MDTextField, it's simply blank.
This is my code in full:
screen_helper = """
ScreenManager:
MenuScreen:
SubmitScreen:
<MenuScreen>:
name: 'menu'
MDTextField:
id : userdata
hint_text: "Enter Username"
helper_text: "or click on forgot username"
#helper_text_mode: "persistent"
helper_text_mode: "on_focus"
icon_right: "account"
icon_right_color: app.theme_cls.primary_color
pos_hint : {'center_x': 0.5, 'center_y': 0.4}
size_hint_x:None
width:250
mode : "rectangle"
MDTextField:
id: userpass
hint_text: "Enter Password"
helper_text: "or click on forgot Password"
#helper_text_mode: "persistent"
password : True
helper_text_mode: "on_focus"
icon_right: "eye-off"
icon_right_color: app.theme_cls.primary_color
pos_hint : {'center_x': 0.5, 'center_y': 0.3}
size_hint_x:None
width:250
mode : "rectangle"
MDLabel:
text: "Company X"
pos_hint: {'center_x':0.5, 'center_y':0.7}
font_style: 'H3'
halign: 'center'
MDRectangleFlatButton:
text: 'Submit'
pos_hint: {'center_x':0.5, 'center_y':0.2}
font_size : 20
on_press:
app.getname()
app.root.current = 'submit'
<SubmitScreen>:
name: 'submit'
NavigationLayout:
ScreenManager:
Screen:
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Company X"
left_action_items: [["menu", lambda x : nav_drawer.toggle_nav_drawer()]]
elevation: 11
Widget:
MDFillRoundFlatIconButton:
spacing: '8dp'
padding: '20dp'
text: 'Menu'
pos_hint: {'center_x':0.5, 'center_y':0.9}
icon: 'account-child'
on_press: root.manager.current = 'menu'
MDFillRoundFlatIconButton:
text: 'View Account'
pos_hint: {'center_x':0.5, 'center_y':1}
font_size : 20
icon: 'account-cash'
on_press:
MDBottomAppBar:
md_bg_color: 0, 1, 0, 1
MDToolbar:
title: "by Tech Company"
left_action_items: [["coffee", lambda x : app.navigation_draw0()]]
right_action_items: [["clock", lambda x : app.navigation_draw1()]]
mode: 'free-end'
elevation: 13
type: 'bottom'
icon: 'account-check'
MDNavigationDrawer:
id: nav_drawer
BoxLayout:
orientation: 'vertical'
spacing: '8dp'
padding: '12dp'
Image:
source: 'img.jpg'
MDLabel:
text: root.usn
font_style: 'Subtitle1'
size_hint_y:None
height: self.texture_size[1]
MDLabel:
text: 'email#gmail.com'
font_style: 'Caption'
size_hint_y:None
height: self.texture_size[1]
ScrollView:
MDList:
#OneLineListItem:
OneLineIconListItem:
text: 'Profile'
IconLeftWidget:
icon: 'face-profile'
OneLineIconListItem:
text: 'Upload'
IconLeftWidget:
icon: 'upload'
OneLineIconListItem:
text: 'Logout'
conLeftWidget:
icon: 'logout'
MDRectangleFlatButton:
text: 'Menu'
pos_hint: {'center_x':0.5, 'center_y':0.4}
on_press: root.manager.current = 'menu'
MDRectangleFlatButton:
text: 'View Account'
pos_hint: {'center_x':0.5, 'center_y':0.3}
on_press:
"""
class MenuScreen(Screen):
pass
class SubmitScreen(Screen):
usn = StringProperty()
sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(SubmitScreen(name='submit'))
sm.add_widget(UploadScreen(name='upload'))
sm.add_widget(AccountScreen(name='account'))
class DemoApp(MDApp):
def build(self):
screen = Builder.load_string(screen_helper)
self.theme_cls.primary_palette = "Purple"
self.theme_cls.accent_palette = 'Blue'
self.theme_cls.primary_hue = "200"
self.theme_cls.theme_style = "Dark"
return screen
def getname(self):
usn = (self.root.get_screen("menu").ids.userdata.text)
DemoApp().run()

Set an ID to the MDLabel and then in the getname function change the MDLabel text to the input of the MDTextField.
In kv:
MDLabel:
text: "Text before"
id: label
In python:
def getname(self):
usn = (self.root.get_screen("menu").ids.userdata.text)
self.root.ids.label.text = usn

Kivy Unknown class <NavigationDrawerIconButton>

Trying kv using the example https://github.com/FranciscoCarbonell/kivymd-login-example but got `kivy.factory.FactoryException: Unknown class
Problem is in
MainNavigationLayout:
MDNavigationDrawer:
id: navigation_drawer
drawer_logo: "menu.png"
NavigationDrawerIconButton:
icon: "home"
text: "Inicio"
on_release: screen_manager.current = "screen_inicio"
NavigationDrawerIconButton:
icon: "lock"
text: "Pagina segunda"
on_release: screen_manager.current = "screen_segundo"

You are getting this error because the usage of navigation drawer has changed refer to
https://github.com/kivymd/KivyMD/wiki/Components-Navigation-Drawer#using-mdnavigationdrawer-has-changed
If you are looking for a login example.
Here is a login form I have designed earlier (username:admin, password:admin) :
login.py
from kivymd.app import MDApp
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import ScreenManager as scr_mngr
from kivymd.toast import toast
from kivy.core.window import Window
from kivymd.uix.tab import MDTabsBase
from kivy.uix.floatlayout import FloatLayout
class Tab(FloatLayout, MDTabsBase):
pass
class MyLayout(BoxLayout):
def check_data_login(self):
self.ids['spinner'].active=True
username = self.ids['username'].text
password = self.ids['password'].text
print(username)
print(password)
if not username and not password:
toast("Username and password are required")
elif not username:
toast("Username is required ")
elif not password:
toast("Password is required")
else:
if username == "admin" and password == "admin":
self.ids['spinner'].active=False
self.change_screen("screen2")
else:
self.ids['spinner'].active=False
toast("Wrong username or password")
def change_screen(self, screen, *args):
self.scr_mngr.current = screen
class DemoApp(MDApp):
pass
if __name__ == '__main__':
Window.show_cursor = True
Window.size = (360, 680)
DemoApp().run()
demo.kv
MyLayout:
scr_mngr: scr_mngr
orientation: 'vertical'
ScreenManager:
id: scr_mngr
Screen:
id: screen1
name: 'screen1'
MDSpinner:
id:spinner
size_hint: None, None
size: dp(46), dp(46)
pos_hint: {'center_x': .5, 'center_y': .5}
active: False
MDToolbar:
md_bg_color: 0, 0, 1, 1
title: "Login Screen"
pos_hint:{"top": 1}
elevation: 11
BoxLayout:
orientation: "vertical"
padding: "16dp"
spacing: "16dp"
size_hint_y: None
height: self.minimum_height
pos_hint: {"center_y": .6}
MDLabel:
text: "Log In"
halign: "center"
font_style: "H4"
size_hint_y: None
MDTextField:
id: username
hint_text: "Username "
helper_text_mode: "on_focus"
required: True
MDTextField:
id: password
hint_text: "Password "
helper_text_mode: "on_focus"
required: True
password: True
MDRaisedButton:
text: "LOGIN"
pos_hint: {"center_x": 0.5, "center_y": 0.3}
on_release: root.check_data_login()
Screen:
id: screen2
name: 'screen2'
BoxLayout:
orientation: 'vertical'
MDToolbar:
md_bg_color: 0, 0, 1, 1
id: toolbar
title: "Page 2"
BoxLayout:
orientation: 'vertical'
MDTabs:
Tab:
text: "Tab1"
Tab:
text: "Tab2"