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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

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

Builder.load_file("main.kv")


class P(Popup):
    label_text = StringProperty()

    def __init__(self, title, content, **kwargs):
        super(P, self).__init__(**kwargs)
        self.title = title
        self.label_text = content
        self.size_hint = (None, None)
        # self.size = (dp(400), dp(400))
        self.size = (self.width - 20, self.height - 20)
        print(self.size)
        # self.center = (self.width / 2, self.height / 2)


class FirstScreen(Screen):
    @staticmethod
    def show_popup(screen):
        content = f"(1) This is the content of the\ncustom popup from {screen.name}"
        P(title=screen.name, content=content).open()

    @staticmethod
    def on_press():
        print("on_press")


class TestApp(App):
    def build(self):
        screen_manager = ScreenManager()
        screen_manager.add_widget(FirstScreen(name="first_screen"))
        return screen_manager


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

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<P>:
    BoxLayout:
        orientation: 'vertical'

        Label:
            text: root.label_text
            size_hint: dp(.6), dp(.2)
            pos_hint: {"x": dp(.2), "top": dp(1)}

        Button:
            text: "Ok"
            size_hint_y: None
            height: dp(40)
            pos_hint: {"x": dp(0), "y": dp(.1)}
            on_press: root.dismiss()


<FirstScreen>:
    BoxLayout:
        orientation: 'vertical'

        Button:
            text: 'Show Popup'
            on_press: root.show_popup(root)

        Button:
            text: 'Go to Second Screen'
            on_press:
                root.on_press()

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class TestApp(App):
    def build(self):
        if platform == "android" or platform == "ios":
            Window.maximize()
        else:
            Window.size = (600, 800)  # 600, 1024
        screen_manager = ScreenManager()
        screen_manager.add_widget(FirstScreen(name="first_screen"))
        screen_manager.add_widget(SecondScreen(name="second_screen"))
        return screen_manager

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class PopupErrors(Popup):
    error_text = StringProperty()

    def __init__(self, title, content, **kwargs):
        super(PopupErrors, self).__init__(**kwargs)
        self.title = title
        self.error_text = content
        self.size_hint = (None, None)
        self.size = (Window.width * 0.8, Window.height * 0.6)

Code: Alles auswählen

<PopupErrors>:
    BoxLayout:
        orientation: 'vertical'

        Label:
            text: root.error_text
            font_size: '14sp'
            pos_hint: {"x": dp(0), "top": dp(1)}

        Button:
            text: "Schließen"
            font_size: '16sp'
            size_hint_y: None
            height: self.texture_size[1] + dp(40)
            pos_hint: {"x": dp(0), "y": dp(.1)}
            on_press: root.dismiss()