为kivy上的按钮添加图像

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image

class ImageButtonApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        
        button = Button(text='Click Me', size_hint=(None, None), size=(200, 100))
        image = Image(source='button_image.png')
        
        button.background_normal = image.source
        button.background_down = image.source
        
        def on_button_click(instance):
            print("Button clicked!")
        
        button.bind(on_release=on_button_click)
        
        layout.add_widget(button)
        return layout

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