Python 3.x 如何从kivymd中的文本输入中获取数据

我是kivy和kivymd的新手。我想从文本输入中获取文本。但在从按钮调用python文件中的提交函数时遇到了一个问题。我使用了导航抽屉代码。 是否必须在类ContentNavigationDrawer中定义提交函数，或者 类TestNavigationDrawer？ 提前谢谢 下面是代码

白痴

.kv

---

您需要在打印语句中使用

self.root.ids.namee.text

而不是

self.namee.text

from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.properties import StringProperty, ListProperty
from kivymd.uix.list import OneLineIconListItem, MDList

from kivymd.app import MDApp




class ItemDrawer(OneLineIconListItem):
    icon = StringProperty()
    text_color = ListProperty((0, 0, 0, 1))


class ContentNavigationDrawer(BoxLayout):
    screen_manager = ObjectProperty()
    nav_drawer = ObjectProperty()



class TestNavigationDrawer(MDApp):
    namee = ObjectProperty()


    def build(self):
        kv= Builder.load_file("screenmd.kv")
        self.theme_cls.primary_palette = "Red"
        return kv

    def submit(self):
        print(self.namee.text)




TestNavigationDrawer().run()

<ContentNavigationDrawer>:
    orientation: "vertical"
    padding: "8dp"
    spacing: "8dp"

    AnchorLayout:
        anchor_x: "left"
        size_hint_y: None
        height: avatar.height

        Image:
            id: avatar
            size_hint: None, None
            size: "56dp", "56dp"
            source: "data/logo/kivy-icon-256.png"

    MDLabel:
        text: "KivyMD library"
        font_style: "Button"
        size_hint_y: None
        height: self.texture_size[1]

    MDLabel:
        text: "kivydevelopment@gmail.com"
        font_style: "Caption"
        size_hint_y: None
        height: self.texture_size[1]

    ScrollView:

        MDList:

            OneLineListItem:
                text: "Screen 1"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "scr 1"

            OneLineListItem:
                text: "Screen 2"
                on_press:
                    root.nav_drawer.set_state("close")
                    root.screen_manager.current = "scr 2"


Screen:

    MDToolbar:
        id: toolbar
        background_color: app.theme_cls.primary_dark
        pos_hint: {"top": 1}
        elevation: 10
        title: "Iota World"
        left_action_items: [["menu", lambda x: nav_drawer.set_state("open")]]

    NavigationLayout:
        x: toolbar.height

        ScreenManager:
            id: screen_manager

            Screen:
                name: "scr 1"

                namee:namee


                MDTextField:
                    id:namee
                    hint_text: "Name"
                    helper_text:"forget"
                    pos_hint : {'center_x':0.5 ,'center_y':0.5}
                    size_hint_x : None
                    width: 300
                MDRectangleFlatButton:
                    text: "Submit"
                    pos_hint : {'center_x':0.5 ,'center_y':0.4}
                    text_color: 0, 0, 1, 1
                    md_bg_color: 1, 1, 0, 1
                    on_release:
                        print("success")
                        app.submit()


            Screen:
                name: "scr 2"

                MDLabel:
                    text: "Screen 2"
                    halign: "center"

        MDNavigationDrawer:
            id: nav_drawer

            ContentNavigationDrawer:
                screen_manager: screen_manager
                nav_drawer: nav_drawer
                id: content_drawer

print(self.namee.text)
 AttributeError: 'NoneType' object has no attribute 'text'