Auto dismiss a popup in kivy

Question

I need to dismiss the pop up after finishing a function in another class, or at least after specific time like (3 second) the pop up displaying loading gif image to notify the user to wait for operating the functions

loading image

*******python******

from kivy.app import App 
from kivy.uix.popup import Popup 
from kivy.lang import Builder 
from kivy.uix.screenmanager import ScreenManager, Screen

class ScreenManagement(ScreenManager):
    pass

class progress(Popup):  
    pass 
class Func_(Screen):
# function
    pass

presentation = Builder.load_file("Try_.kv") 
class MainApp(App):

    def build(self):
        return presentation

if __name__ == "__main__":
    MainApp().run()

********KV File*********

#:import Factory kivy.factory.Factory

<Popup>:
    separator_color: 1, 1, 1, 1
    background: "White.png"
    Button:
        id: btn
        disabled: True
        background_disabled_normal: "White.png"
        text: "Hello"
        Image:
            source: "Loading.gif"
            size: root.size

ScreenManagement:
    PopupBox:

<PopupBox>:
    BoxLayout:
        Button:
            text: "Click"
            on_release:
                Factory.Popup().open()

Answer 1

You have to add a function to dismiss the Popup message and use Clock.schedule_once to call that function. Please refer to the example below for details.

main.py

from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.clock import Clock


class ScreenManagement(ScreenManager):
    pass


class Progress(Popup):

    def __init__(self, **kwargs):
        super(Progress, self).__init__(**kwargs)
        # call dismiss_popup in 2 seconds
        Clock.schedule_once(self.dismiss_popup, 2)

    def dismiss_popup(self, dt):
        self.dismiss()


class Func(Screen):
    # function
    pass


class MainApp(App):

    def build(self):
        return ScreenManagement()

if __name__ == "__main__":
    MainApp().run()

main.kv

#:import Factory kivy.factory.Factory
#:import FadeTransition kivy.uix.screenmanager.FadeTransition

<Progress>:
    separator_color: 1, 1, 1, 1
    background: "White.png"
    Button:
        id: btn
        disabled: True
        background_disabled_normal: "White.png"
        text: "Hello"
        Image:
            source: "Loading.gif"
            size: root.size

<ScreenManagement>:
    transition: FadeTransition()
    Func:

<Func>:
    BoxLayout:
        Button:
            text: "Click"
            on_release:
                Factory.Progress().open()

Output