KivyMD：使用 MDBottomAppBar 将 MDDataTable 放入/添加到屏幕上的 RecycleBoxLayout答案

【问题标题】：KivyMD: Put/Add a MDDataTable into a RecycleBoxLayout on a screen with MDBottomAppBarKivyMD：使用 MDBottomAppBar 将 MDDataTable 放入/添加到屏幕上的 RecycleBoxLayout
【发布时间】：2021-04-11 16:15:05
【问题描述】：

我需要有关添加 MDDatatable 的帮助。我想用add_widget(datatable) 将 MDDatatable 添加到 RecycleBoxLayout 中。但是屏幕仍然是空的，数据表没有出现。导航中的所有其他功能 e. G。淡入/淡出工作正常。

我尝试了很多方法都没有成功。

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()

【问题讨论】：

标签： python kivymd

【解决方案1】：

我认为问题出在这一行：

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

尝试：

self.screen.add_widget(self.datatable)

【讨论】：

感谢您的回答。我已经尝试过您的建议，它会显示列表但会阻止导航和功能。抱歉，这个建议并不能解决我的问题。