Is it possible to change the colors in the spinner values with kivy?

Question

from kivy.uix.spinner import Spinner, SpinnerOption
from kivy.uix.dropdown import DropDown
from functools import partial

class ThirdScreen(Screen):
    def __init__(self, **kwargs):
        super(ThirdScreen, self).__init__(**kwargs)
        self.bl_up2 = BoxLayout(orientation='vertical', spacing = 20)


        ColoredDropdown = partial(DropDown, bar_color=(1, 0, 1, 1))
        self.spin1 = Spinner(dropdown_cls = ColoredDropdown,
            text='gender', values = ("1", "2")

        self.bl_up2.add_widget(self.spin1)     
        self.add_widget(self.bl_up2)

I just started learning Python and maybe my mistake is superficial, but I don't understand where the mistake is. Added dropdown but something went wrong. wrote the code without kv lang. I don't understand it and yes my code is huge.

Answer 1

An easy way to do that is by using the kv language to define your dropdown_cls. Here is a modified version of your code that does it:

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.screenmanager import Screen
from kivy.uix.spinner import Spinner

Builder.load_string('''
<ColoredDropdown@DropDown>:
    bar_color: 1, 0, 1, 1
''')


class ThirdScreen(Screen):
    def __init__(self, **kwargs):
        super(ThirdScreen, self).__init__(**kwargs)
        self.bl_up2 = BoxLayout(orientation='vertical', spacing=20)

        values = []
        for i in range(20):
            values.append(str(i))

        self.spin1 = Spinner(dropdown_cls='ColoredDropdown', size_hint=[0.25, None], height=55,
            text='gender', values=values)

        self.bl_up2.add_widget(self.spin1)
        self.add_widget(self.bl_up2)

class TestApp(App):
    def build(self):
        return ThirdScreen()


TestApp().run()

The Builder.load_string specifies a rule for creating instances of ColoredDropDown using the kivy language. Then specifying the dropdown_cls as a string in the Spinner creation tells Kivy to use Factory when creating the ColoredDropDown, See the documentation.