将用户选择中的值保存到kivy中的列表

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.label import Label

class MyBoxLayout(BoxLayout):
    def __init__(self, **kwargs):
        super(MyBoxLayout, self).__init__(**kwargs)
        self.orientation = 'vertical'
        self.selected_values = []  # 用于保存用户选择的值的列表

        self.label = Label(text='请选择值：')
        self.add_widget(self.label)

        self.button1 = Button(text='值1', on_release=self.add_value)
        self.add_widget(self.button1)

        self.button2 = Button(text='值2', on_release=self.add_value)
        self.add_widget(self.button2)

        self.button3 = Button(text='值3', on_release=self.add_value)
        self.add_widget(self.button3)

        self.button4 = Button(text='保存选择', on_release=self.save_values)
        self.add_widget(self.button4)

    def add_value(self, button):
        value = button.text
        self.selected_values.append(value)
        self.label.text = f'已选择的值：{", ".join(self.selected_values)}'

    def save_values(self, button):
        # 在这里可以将self.selected_values保存到数据库或其他持久化方式
        self.label.text = '选择已保存'

class MyApp(App):
    def build(self):
        return MyBoxLayout()

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