更改两个不同kivy屏幕的大小

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.core.window import Window

class Screen1(Screen):
    pass

class Screen2(Screen):
    pass

class MyApp(App):
    def build(self):
        # 创建屏幕管理器
        sm = ScreenManager()

        # 创建两个屏幕对象
        screen1 = Screen1(name='screen1')
        screen2 = Screen2(name='screen2')

        # 设置屏幕的大小
        Window.size = (400, 300)  # 设置屏幕1的大小
        Window.size = (800, 600)  # 设置屏幕2的大小

        # 添加屏幕到屏幕管理器
        sm.add_widget(screen1)
        sm.add_widget(screen2)

        return sm

if __name__ == '__main__':
    MyApp().run()