Kivy does not update the refreshed data on the screen. If i restart the app, i can see the new data after calculation. I want to see refreshed data on the screen after the calculation is done, without restarting the program again.
When i run the app, datas() function pulls the json file at the first time and also when i on the second calculation screen, before calculation, the Clock.schedule_once(self.datas) pulls the data again as well but sill i can't see the refreshed names on the screen.
PY File:
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.metrics import dp
from kivy.uix.behaviors import ButtonBehavior
from kivy.clock import Clock, mainthread
import json
import threading
class Test(BoxLayout):
def __init__(self, **kwargs):
super(Test, self).__init__(**kwargs)
self.data = self.datas()
# Homepage Screen
def homepage(self, screenmanager):
screenmanager.current = 'homepage_screen'
Clock.schedule_once(self.clear_widgets)
# Clear Widgets
def clear_widgets(self, *args):
for child in [child for child in self.ids.gridsonuc.children]:
self.ids.gridsonuc.remove_widget(child)
# Under Over Screen
def second(self,screenmanager):
screenmanager.current = 'second_screen'
Clock.schedule_once(self.clear_widgets)
Clock.schedule_once(self.datas) # Before calculation, each time app pulls data again, but Kivy Does Not Update The Refreshed Data in The Screen!
Clock.schedule_once(self.calculate)
# or, if i can use threading system as well but this time i must add @mainthread above def calculate(self, *args): to make code work.
# in both scenario, Kivy Does Not Update The Refreshed Data in The Screen While APP is Running.
# mythread1 = threading.Thread(target=self.clear_widgets)
# mythread1.start()
# mythread2 = threading.Thread(target=self.datas)
# mythread2.start()
# mythread3 = threading.Thread(target=self.calculate)
# mythread3.start()
# Calculation
#@mainthread
def calculate(self, *args):
for i in self.data['home']:
box = BoxLayout(size_hint_y = None, height = dp(50))
hometeams = Label(text = f'{[i]}', font_name = 'Roboto', font_size = dp(15), size_hint = (0.225, 1), halign='center', bold = True )
box.add_widget(hometeams)
self.ids.gridsonuc.add_widget(box)
def datas(self, *args):
# PLEASE CHANGE THE LOCATION!!!!!!!!!!!!!!!!!
with open ("C:\\Users\\Messi\\Desktop\\Python\\Projects\\Football Tips\\Kivy\\Testing Bugs\\Test1\\data.json", "r") as dosya:
dataApi = json.load(dosya)
print('datas updated')
return dataApi
class TestApp(App):
def build(self):
return Test()
if __name__ == '__main__':
TestApp().run()
KV File:
#:import NoTransition kivy.uix.screenmanager.NoTransition
<Test>:
ScreenManager:
transition: NoTransition()
id: sm
size: root.width, root.height
Screen:
name: 'homepage_screen'
BoxLayout:
size_hint: 1, 0.10
Button:
text: 'Calculate'
id: underOver_button_homepage
on_press: root.second(sm)
background_color: 0, 0, 0, 0
Screen:
name: 'second_screen'
BoxLayout:
spacing: '20dp'
orientation: 'vertical'
BoxLayout:
size_hint: 1, 0.80
ScrollView:
scroll_type: ['bars', 'content']
bar_margin: '5dp'
bar_color: 1, 0.4, 0.769, 1
bar_width: '5dp'
bar_inactive_color: 1, 0.4, 0.769, 1
GridLayout:
id: gridsonuc
cols: 1
spacing: '50dp'
size_hint_y: None
height: self.minimum_height
BoxLayout:
size_hint: 1, 0.10
Button:
text: 'Home'
id: home_button_underOver
on_press: root.homepage(sm)
background_color: 0, 0, 0, 0
data.json File
Please create a data.json file and PLEASE CHANGE THE LOCATION!!!!!!!!!!!!!!!!! in def datas(self, *args): with open ("C:\Users\Messi\Desktop\Python\Projects\Football Tips\Kivy\Testing Bugs\Test1\data.json", "r") as dosya:
{"home": ["Manchester City", "Arsenal"]}
Video Of The Problem https://www.youtube.com/watch?v=mMwryGLQ5SQ
Thanks for your help
The problem is that your display is created using self.data, but when you call the datas() method and read the updated json file, you don't do anything with the newly read data. Try changing:
def datas(self, *args):
# PLEASE CHANGE THE LOCATION!!!!!!!!!!!!!!!!!
with open ("C:\\Users\\Messi\\Desktop\\Python\\Projects\\Football Tips\\Kivy\\Testing Bugs\\Test1\\data.json", "r") as dosya:
dataApi = json.load(dosya)
print('datas updated')
return dataApi
to:
def datas(self, *args):
# PLEASE CHANGE THE LOCATION!!!!!!!!!!!!!!!!!
with open ("C:\\Users\\Messi\\Desktop\\Python\\Projects\\Football Tips\\Kivy\\Testing Bugs\\Test1\\data.json", "r") as dosya:
dataApi = json.load(dosya)
print('datas updated')
self.data = dataApi # update the self.data
return dataApi