I'm new to Kivy, I'm working on a tracking app for vehicle repair and I've got a list of appointments and I'm trying to go to a different screen when you press an item on the list and I I have no clue on why it isn't working for me as it says that it is on a different screen but it isn't on the app
from kivymd.app import MDApp
from kivy.lang.builder import Builder
from kivymd.uix.list import ThreeLineAvatarIconListItem
from kivymd.uix.list import ImageLeftWidget
from kivy.uix.screenmanager import Screen, ScreenManager, SwapTransition, CardTransition
from kivy.core.window import Window
import sqlite3
DatabaseConnection = sqlite3.connect('CarWorkshopDB.db')
cursor = DatabaseConnection.cursor()
Window.size= (400, 650)
class MainScreen(Screen):
pass
class AddScreen(Screen):
pass
class DetailsScreen(Screen):
pass
class WorkApp(MDApp):
def build(self):
self.screen_manager = ScreenManager(transition=CardTransition())
self.screen_manager.add_widget(MainScreen(name='MainScreen'))
self.screen_manager.add_widget(AddScreen(name='AddScreen'))
self.screen_manager.add_widget(DetailsScreen(name='DetailsScreen'))
screen = Builder.load_file("test2.kv")
return screen
def on_start(self):
client = 'John smith'
cursor.execute("SELECT TrackingNumber, Plate, Status FROM Appointments WHERE Customer =?", (client,))
for i in cursor:
self.new_message(i[0], i[1], i[2])
def new_message(self, TrackingNumber, Vehicle, Process):
new_message = ThreeLineAvatarIconListItem(text=TrackingNumber, secondary_text=Vehicle, tertiary_text=Process)
new_message.add_widget(ImageLeftWidget(source='RepairIMG.jpg'))
new_message.bind(on_release=self.on_touch_down)
self.root.ids.list.add_widget(new_message)
def on_touch_down(self, x):
print(self.screen_manager.current)
self.screen_manager.current = "DetailsScreen"
self.screen_manager.transition.direction = 'right'
print(self.screen_manager.current)
WorkApp().run()
this is the list code in the kv file
NavigationLayout:
ScreenManager:
id: screen_manager
MainScreen:
name : "MainScreen"
BoxLayout:
orientation:'vertical'
MDBottomNavigation:
panel_color: 1, .643, 0, 1
MDBottomNavigationItem:
name: 'screen 1'
text: 'Home'
icon: 'alpha-h-circle'
MDToolbar:
title: 'Add Repair'
md_bg_color: 1, .643, 0, 1
elevation: 6
pos_hint: {'top':1}
Widget:
MDBottomNavigationItem:
name: 'screen 2'
text: 'Track'
icon: 'alpha-t-circle'
MDToolbar:
id: toolbar
title: 'Track History'
md_bg_color: 1, .643, 0, 1
elevation: 6
pos_hint: {'top':1}
NavigationLayout:
x: toolbar.height
size_hint_y: 1.0 - toolbar.height/root.height
ScreenManager:
Screen:
name: 'ScrollViewScreen'
ScrollView:
MDList:
id: list
MDFloatingActionButton:
icon: 'plus'
md_bg_color: 1, .643, 0, 1
on_release:
screen_manager.current = 'AddScreen'
screen_manager.transition = CardTransition()
screen_manager.transition.direction = "down"
pos_hint: {'x': .84, 'y': .02}
MDBottomNavigationItem:
name: 'screen 4'
text: 'More'
icon: 'dots-horizontal'
MDToolbar:
title: 'More'
md_bg_color: 1, .643, 0, 1
elevation: 6
pos_hint: {'top':1}
Widget:
MDLabel:
text: 'dfsfdsf'
halign: 'center'
AddScreen:
name: 'AddScreen'
id: Add
FloatLayout:
orientation: 'vertical'
MDToolbar:
id: toolbar2
title: 'Add Tracking Number'
md_bg_color: 1, .643, 0, 1
elevation: 6
pos_hint: {'top':1}
MDIconButton:
icon : 'close'
pos_hint : {'top':0.98, 'x':0.85}
on_release :
screen_manager.current = "Main"
screen_manager.transition = CardTransition()
screen_manager.transition.direction = "up"
FloatLayout:
x: toolbar2.height
size_hint_y: 1.0 - toolbar.height/root.height
ScatterLayout:
MDLabel:
text: 'Track Repair'
font_style: 'H4'
valign: 'top'
pos_hint: {'top':1}
text_size: self.size
size_hint: None, None
MDTextFieldRound:
icon_left: 'alpha-t-circle'
hint_text: 'Tracking Number'
normal_color: 1, .643, 0, 1
pos_hint: {'y':.7}
text_size: self.size
MDTextFieldRound:
icon_left: 'alpha-p-circle'
hint_text: 'Postcode'
normal_color: 1, .643, 0, 1
pos_hint: {'y':.6}
text_size: self.size
MDTextButton:
text: "Cant find your tracking number?"
custom_color: 1, .643, 0, 1
pos_hint: {'y':.5}
halign: 'center'
MDRectangleFlatButton:
text: 'confirm'
pos_hint: {'y':.4}
valign: 'middle'
text_size: self.size
DetailsScreen:
name: 'DetailsScreen'
id: Details
BoxLayout:
orientation: 'vertical'
MDLabel:
text: 'details Screen?'
question from:
https://stackoverflow.com/questions/65911767/use-of-screenmanager-in-kivy-file-and-python-file 
