An example of how to create an infinite scroll with recycleview (appending data as user scrolls)

dyn_rv.py

from kivy.lang import Builder
from kivy.properties import ListProperty
from kivy.app import App
from random import sample
from string import ascii_letters as letters


KV = '''
<MyButton@Button>:
    on_press: print(self.text)

RecycleView:
    data: app.data
    on_scroll_y: app.fill_data(self, box)
    viewclass: 'MyButton'
    bar_width: 20

    RecycleBoxLayout:
        id: box
        orientation: 'vertical'
        size_hint_y: None
        height: self.minimum_height
        default_size_hint: 1, None
        default_size: 0, 100
'''


class DataApp(App):
    data = ListProperty([])

    def build(self):
        self.fetch_data(10)
        print(self.data)
        return Builder.load_string(KV)

    def fill_data(self, rv, box):
        top = (box.top - rv.y) / box.height
        if rv.scroll_y * box.height < rv.height / 2:
            self.fetch_data(10)
            y = top + rv.height
            rv.scroll_y = y / box.height
        # rv.effect_y.update(y / box.height)

    def fetch_data(self, length):
        data = []
        n = len(self.data)
        for i in range(length):
            data.append({'text': '{}: '.format(n + i) + ''.join(sample(letters, 10))})
        self.data.extend(data)


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

version with fixed scrolling here https://gist.github.com/tshirtman/41e533d077567762b3bd981f718f3cd6

when you scroll about a page and a half .
for me on windows laptop the scroll view contains 6 visible items (0-5).
while scrolling down, I have slowed down scrolling at the moment when index 12 about to disappear.
Then with just a single scrolling step, instead of being 13 as the first appearing element.
It jumped to be starting from 17

Please have a look at the attached animation. focus on the frame when element index 12 is about to disappear.

Thank you for the great work!