Python KivyMD：使用MDBottomAppBar将MDDataTable放入/添加到屏幕上的RecycleBox布局中

我需要添加MDDatatable的帮助。我想使用

add\u小部件（datatable）

将MDDatatable添加到RecycleBoxLayout中。但屏幕仍然为空，数据表不会出现。导航e中的所有其他功能。G淡入/淡出功能正常

我尝试了很多方法，但都没有成功

我做错了什么

from kivy.lang import Builder
from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivymd.app import MDApp
from kivymd.uix.label import MDLabel
from kivymd.uix.screen import Screen
from kivymd.uix.datatables import MDDataTable
from kivy.uix.button import Button
from kivy.properties import NumericProperty, ListProperty,StringProperty
from kivy.graphics import Color
from kivy.metrics import dp
from kivy.core.window import Window

Window.size = (300, 500)

screen_helper= """

Screen:
   
   NavigationLayout:
       ScreenManager:
           id : scrn_manager
           Screen:
               
               BoxLayout:
                   orientation: 'vertical'
  
                   MDLabel:
                       text: 'Meine Einkaufsliste'
                       
                       size_hint_y: None
                       height: self.texture_size[1]
                       halign: "center"
                   RecycleView:
                       id: rv
                       key_viewclass: 'viewclass'
                       key_size: 'height'

                       RecycleBoxLayout:
                           id: rbl
                           orientation: 'vertical'
                           height: dp(650)
                           width: dp(250)
                           
                   MDBottomAppBar:
                       MDToolbar:
                           title: 'Tools'
                           icon: "git"
                           type: "bottom"
                           md_bg_color: app.theme_cls.primary_color
                           specific_text_color: app.theme_cls.accent_color
                           left_action_items: [["menu", lambda x: nav_drawer.set_state()]]
                           #on_action_button: app.navigation_draw()
                           elevation: 10
                           MDIconButton:
                               icon: 'magnify'
                           MDTextField:
                               id: search_field
                               hint_text: 'Search icon'
       MDNavigationDrawer:
           id: nav_drawer             
           BoxLayout:
               orientation: 'vertical'
               spacing: '8dp'
               padding: '8dp'
               
               MDLabel:
                   text: 'Tools'
                   size_hint_y: None
                   height: self.texture_size[1]
               ScrollView:    
                   MDList:
                       OneLineIconListItem:
                           on_release: app.new_item()
                           text: 'Neuer Artikel'
                           IconLeftWidget:
                               icon: 'camera-plus'
                       OneLineIconListItem:
                           on_release: app.item_upload()
                           text: 'Synchro auf Server'
                           IconLeftWidget:
                               icon: 'file-upload'
                           
"""


class ShoppinglistApp(MDApp):
   column_data = ListProperty([])
   row_data = ListProperty([])
   
   def build(self):

       self.screen = Builder.load_string(screen_helper)  
       self.data_table()
       
       return self.screen
   
   def data_table(self):
       self.datatable = MDDataTable(pos_hint={'center_x':0.5, 'center_y':0.5},
                               size_hint=(0.9,0.6), 
                               check=True,
                               rows_num=10,
                               column_data=[("Artikel",dp(30)),
                                            ("Menge",dp(15)),
                                            ("Geschäft",dp(30))
                                            ],
                               row_data=[("Tee: Earl Gray", "1", "Kaufland"),
                                         ("Kartoffeln", "2,5 kg", "Kaufland"),
                                         ("CW Obst&Sahne", "1", "Kaufland"),
                                         ("Bananen etwas grün ", "5", "Aldi"),
                                         ("Mangosaft ", "1", "Kaufland"),
                                         ("Pizateig von Omas Kühltruhe ", "1", "Edeka"),
                                         ("Rinderrouladen Oberschale", "4", "Edeka"),
                                         ("Joghurt 4er ", "2", "Kaufland")
                                         ]
                               )
       self.datatable.bind(on_check_press=self.check_press)
       self.datatable.bind(on_row_press=self.row_press)
       self.screen.ids.rbl.add_widget(self.datatable)
       
       
   
   def navigation_draw(self):
       print("NAV")
   
   def check_press(self, instance_table, current_row):
       print(instance_table, current_row)
       
   def row_press(self, instance_table, instance_row):
       print(instance_table, instance_row)   
       
   def new_item(self):
       print('Neuer Artikel')
       
   def item_upload(self):
       print('Hochladen')
   
ShoppinglistApp().run()

---

我认为问题在于这一行：

self.screen.ids.rbl.add_widget(self.datatable)

尝试：

---

谢谢你的回答。我已经尝试过你的建议，它使列表出现，但阻止导航和功能。对不起，这个建议解决不了我的问题。

self.screen.add_widget(self.datatable)