When I click a button different button flashes in kivy recycleview

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So, I know there have been couple of similar questions but I haven't found a solution on any of those questions. When I click one button in my RecycleView screen in my kivy app different button flashes. I haven't changed anything about buttons so I don't see any mistake in my code but there might be something that I have not seen. Here is the code:

from kivy.lang import Builder
from kivy.uix.screenmanager import Screen
from kivy.uix.recycleview import RecycleView
from kivy.app import App

class Kupci_sve(RecycleView, Screen):
    def __init__(self, **kwargs):
        super(Kupci_sve, self).__init__(**kwargs)
        self.data = [{"text": str(i)} for i in range(20)]
        self.bar_width = 8
        self.scroll_type = ['bars']


kv = Builder.load_string('''
<Kupci_sve>:
    name: 'kupci_sve'
    viewclass: 'Button'
    RecycleBoxLayout:
        default_size: (None, 100)
        default_size_hint: (1, None)
        size_hint_y: None
        height: self.minimum_height
        orientation: "vertical"

        ''')


class app(App):
    def build(self):
        return Kupci_sve()

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

I import this screen to my main.py file and run it from there but I didn't paste that code because I think it has nothing to do with this problem. If you need any other info, just tell me. Thank you.

kivy python
1 Answers

Without a minimal, complete, reproducible example, I suspect your problem may be in making your Kupci_sve class extend both Screen and RecycleView. A better approach would be to just extend Screen and simply include a RecycleView in the kv rule for <Kupci_sve>.

Here is what I mean:

<Kupci_sve>:
    name: 'kupci_sve'
    RecycleView:
        id: rv   # added id
        bar_width: 8
        scroll_type: ['bars']
        viewclass: 'Button'
        RecycleBoxLayout:
            default_size: (None, 100)
            default_size_hint: (1, None)
            size_hint_y: None
            height: self.minimum_height
            orientation: "vertical"

And the Kupci_sve class becomes:

class Kupci_sve(Screen):
    def __init__(self, **kwargs):
        super(Kupci_sve, self).__init__(**kwargs)
        self.ids.rv.data = [{"text": str(i), "on_release":partial(self.butt_release, i)} for i in range(20)]

    def butt_release(self, index):
        print('butt_release:', index)
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