(kivy)RecycleViewに組み込んだCheckBoxの状態の取得方法について

一応できたので貼って置きます。

from kivy.app import App
from kivy.config import Config
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, NoTransition
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty, ObjectProperty, BooleanProperty
from kivy.core.text import LabelBase, DEFAULT_FONT
from kivy.resources import resource_add_path
Config.set('graphics', 'width', '800')
Config.set('graphics', 'height', '600')
Config.set('input', 'mouse', 'mouse,disable_multitouch')  # 右クリック赤丸消去
Config.set('kivy', 'exit_on_escape', '0')  # kivy ESC無効化

# Path of Fonts
resource_add_path('/usr/share/fonts/truetype/takao-gothic')
LabelBase.register(DEFAULT_FONT, 'TakaoGothic.ttf')  # 日本語が使用できるように日本語フォントを指定する


# Path of KV_Lang
Builder.load_file("./Account_for_teratail.kv")

# Setting Screen
SM = ScreenManager(transition=NoTransition())


class Manager(Screen):
    rv = ObjectProperty()

    def on_enter(self):
        self.rv.data = [
            {'id': "000000", 'permission': "manager", 'is_checked': True, },
            {'id': "000001", 'permission': "manager", 'is_checked': False, },
            {'id': "000002", 'permission': "manager", 'is_checked': False, },
        ]

    def delete(self):
        # print('DELETE')
        self.rv.data = list(filter(
            lambda item: not item['is_checked'], self.rv.data))


class Row(BoxLayout):
    id = StringProperty()
    permission = StringProperty()
    is_checked = BooleanProperty(False)

    def on_checkbox_press(self, checkbox):
        # print('on_checkbox_press', checkbox.state, checkbox.active)
        rv = SM.get_screen('manager').rv
        for item in rv.data:
            if item['id'] == self.id:
                # print('Found', item)
                item['is_checked'] = checkbox.active
                return


class GUIApp(App):
    """
    実行クラス
    """
    def build(self):
        SM.add_widget(Manager(name="manager"))
        self.title = 'アカウント管理ソフト'
        return SM


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

<Manager>:
    rv: rv
    BoxLayout:
        BoxLayout:
            orientation: "vertical"
            Label:
                size_hint_y: 0.2
                text: "登録ID一覧"
                color: 0, 0, 0, 1
                canvas.before:
                    Color:
                        rgba: 0.75, 0.75, 0.75, 1
                    Rectangle:
                        pos: self.pos
                        size: self.size
            BoxLayout:
                BoxLayout:
                    orientation: "vertical"
                    BoxLayout:
                        size_hint_y: 0.2
                        Label:
                            text: "ID"
                        Label:
                            text: "権限"
                        Label:
                            text: "削除"
                    BoxLayout:
                        canvas:
                            Color:
                                rgba: 0.85, 0.85, 0.85, 1
                            Rectangle:
                                size: self.size
                                pos: self.pos
                        orientation: 'vertical'
                        RecycleView:
                            id: rv
                            scroll_type: ['bars', 'content']
                            scroll_wheel_distance: dp(56)
                            bar_width: dp(10)
                            viewclass: 'Row'
                            RecycleBoxLayout:
                                default_size: None, dp(56)
                                default_size_hint: 1, None
                                size_hint_y: None
                                height: self.minimum_height
                                orientation: 'vertical'
                                spacing: dp(2)
                AnchorLayout:
                    size_hint_x: 0.3
                    anchor_x: "center"
                    anchor_y: "center"
                    Button:
                        text: "削除"
                        size: 80, 40
                        size_hint: None, None
                        on_press: root.delete()
<Row>:
    canvas.before:
        Color:
            rgba: 0.5, 0.5, 0.5, 1
        Rectangle:
            size: self.size
            pos: self.pos
    Label:
        text: root.id
    Label:
        text: root.permission
    CheckBox:
        active: root.is_checked
        on_press: root.on_checkbox_press(self)

.pyファイルが無いので確認はできていませんが多分こんな感じでRowを用意してやれば

class Row(BoxLayout):
    is_checked = BooleanProperty(False)
    id = StringProperty()
    permission = StringProperty()

<Row>:
    canvas.before:
        Color:
            rgba: 0.5, 0.5, 0.5, 1
        Rectangle:
            size: self.size
            pos: self.pos
    Label:
        text: root.id
    Label:
        text: root.permission
    CheckBox:
        active: root.is_checked
        on_active: root.is_checked = args[1]

後はrv.dataからいつでもデータを得られると思いますよ。

for item in rv.data:
    if item['is_checked']:
        # チェックが付いている時に行いたい処理
        print(item['id'], item['permission'])

rv.dataを介してデータの読み書きを行うほうが、データを表示する為のRowというWidgetに依存しないのでいいと思います。