KivyMD - 为什么 MDList 只是在屏幕的一半答案

【问题标题】：KivyMD - why is the MDList just on half of the screenKivyMD - 为什么 MDList 只是在屏幕的一半
【发布时间】：2021-09-08 07:59:59
【问题描述】：

我想使用 ButtonNavigation + MDList，但该列表只能在屏幕的一半上看到（见屏幕截图）。我可以在整个屏幕上显示列表吗？

<CreateScreen>
    name: "create_screen"
    BoxLayout:
        orientation: "vertical"
        ScrollView:
            MDList:
                TwoLineAvatarIconListItem:
                    id: list1
                    text: "Date"
                    secondary_text: "Time"
                    IconLeftWidget:
                        icon: "github"
                        on_release: print("Hello")
                    IconRightWidget:
                        icon: "clock"


        MDBottomNavigation:
            MDBottomNavigationItem:
                name: 'screen 1'
                text: 'Back'
                icon: "arrow-left"
                on_tab_release: root.manager.current = "main_screen"


            MDBottomNavigationItem:
                name: 'screen 2'
                text: 'ADD'
                icon: "calendar-plus"
                on_tab_release: root.create_new_date_picker()

Screenshot - List is just on half screen

【问题讨论】：

标签： kivy kivy-language kivymd

【解决方案1】：

您可以在每个底部项目下添加内容并修复它，您也可以使用 RecycleView 优化内存，使用代码：

<CreateScreen>
    name: "create_screen"
    BoxLayout:
        orientation: 'vertical'
        #do not put the content of your screen or scrollview here,
        #because the bottom toolbar has its own screen body


        MDBottomNavigation:
            MDBottomNavigationItem:
                name: 'screen 1'
                text: 'Back'
                icon: "arrow-left"
                #on_tab_release: root.manager.current = "main_screen"
                ScrollView:
                    MDList:
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            canvas:
                                Color:
                                    rgba: [0,1,0,.3]
                                Rectangle:
                                    pos: self.pos
                                    size: self.size
                            id: list1
                            text: "El Salvador"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            markup: True
                            text: "[i]New promotions"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            canvas:
                                Color:
                                    rgba: [0,0,1,.3]
                                Rectangle:
                                    pos: self.pos
                                    size: self.size
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"


            MDBottomNavigationItem:
                name: 'screen 2'
                text: 'ADD'
                icon: "calendar-plus"
                #on_tab_release: root.create_new_date_picker()
                ScrollView:
                    MDList:
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "star"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            canvas:
                                Color:
                                    rgba: [0,1,0,.3]
                                Rectangle:
                                    pos: self.pos
                                    size: self.size
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "star"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "star"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            canvas:
                                Color:
                                    rgba: [0,0,1,.3]
                                Rectangle:
                                    pos: self.pos
                                    size: self.size
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "star"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"
                        TwoLineAvatarIconListItem:
                            id: list1
                            text: "jbsidis"
                            secondary_text: "Time"
                            IconLeftWidget:
                                icon: "pencil"
                                on_release: print("Hello")
                            IconRightWidget:
                                icon: "clock"

图片如下：

【讨论】：

谢谢，但它对我不起作用，因为用户可以更改列表。所以我不能有多个列表。难道没有别的办法了吗？还是我应该使用其他东西作为按钮导航？
我可以把 MDBottomNavigation 做得小到 MDList 在整个屏幕上吗？
是的，有几种方法可以做到这一点，如果我们使用“on_scroll_move”，我认为最好的方法之一可能是动画 MDBottom 栏以隐藏自身（类似于 VLC Android确实），这是一个很好的问题

【解决方案2】：

我在 MDBottomNaviagtion 中添加了以下内容

MDBottomNavigation:
            height: self.minimum_height
            size_hint: 1, 0.1

现在它只使用它需要的空间。

【讨论】：