如何解决KivyMD应用程序中某些小部件的位置问题
我正在尝试构建一个有关冠状病毒的信息应用程序，我正在使用newsapi实时实现新闻。但是，我在制作时遇到了几个问题，这主要是由于我是KivyMD框架的新手。无论如何，我现在遇到的主要问题是将一些小部件居中并在listitem小部件上定位正确。
代码：
from kivy.lang.builder import Builder
from kivy.uix.screenmanager import ScreenManager,Screen#<--Screen Manager
from kivy.properties import ObjectProperty #<--- Object Propert
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout#<--FloatLayout
from kivy.uix.gridlayout import GridLayout#<--GridLayout
from kivy.uix.scrollview import ScrollView#<--ScrollView
from kivy.uix.button import Button#<--Button
from kivymd.app import MDApp#<--MDApp
from kivy.clock import Clock#<--Clock
import requests#<--Requests
from kivymd.uix.tab import MDTabsBase
from kivymd.uix.list import IRightBodyTouch,OneLineAvatarIconListItem
import json#<--json
import gc#<--gc
import time
from kivymd.uix.list import OneLineListItem
from kivymd.uix.selectioncontrol import MDCheckbox
url = ('http://newsapi.org/v2/everything?'
'q=Coronavírus&'
'language=pt&'
'apiKey=f5e80820673d4590ac59b11d3be9013a')
#Try connecting to NewsApi
try:
response = requests.get(url)
toph = response.json()
eachnews = toph.get('articles')
separatenews1 = eachnews[-1]
separatenews2 = eachnews[-2]
separatenews3 = eachnews[-3]
titlen1 = "[b]1# [/b]" + str(separatenews1.get('title'))
titlen2 = "[b]2# [/b]" + str(separatenews2.get('title'))
titlen3 = "[b]3# [/b]" + str(separatenews3.get('title'))
img1 = str(separatenews1.get('urlToImage'))
img2 = str(separatenews2.get('urlToImage'))
img3 = str(separatenews3.get('urlToImage'))
except (requests.exceptions.ConnectionError,HTTPError):
r.status_code = "Connection refused"
#disable gc
gc.disable()
#kivy language file
Kv_string = '''
#:import ScrollEffect kivy.effects.scroll.ScrollEffect
#:import images_path kivymd.images_path
<ContentNavigationDrawer>:
orientation: "vertical"
padding: "8dp"
spacing: "8dp"
AnchorLayout:
anchor_x: "left"
anchor_y: "top"
size_hint_y: None
height: image_init.height
Image:
id: image_init
size_hint: None,None
size: "100dp","100dp"
source: "Lokgo.jpg"
ScrollView:
MDList:
OneLineAvatarIconListItem:
text:"Notícias"
pos_hint:{'y':0.8}
on_press: root.nav_drawer.set_state("close")
on_press:root.screen_man.current = "subscreen1"
IconLeftWidget:
icon:"newspaper"
OneLineAvatarIconListItem:
text:"Curados"
on_press:root.nav_drawer.set_state("close")
on_press:root.screen_man.current = "subscreen2"
IconLeftWidget:
icon:"medical-bag"
OneLineAvatarIconListItem:
text:"Pesquisa"
on_press:root.nav_drawer.set_state("close")
on_press:root.screen_man.current = "subscreen3"
IconLeftWidget:
icon:"align-horizontal-left"
ScreenMain:
screen_man:screen_man
NavigationLayout:
ScreenManager:
id:screen_man
Screen:
name:"screen1"
FloatLayout:
orientation:'vertical'
AsyncImage:
size_hint_x: 1
size_hint_y:
allow_stretch: True
source:"https://i.ibb.co/ftV87fN/corons.gif"
pos_hint:{'center_x':0.5,'y':0.35}
border_radius:[20,20,20]
MDLabel:
text:"Bem-vindo(a)"
halign:'center'
MDRoundFlatButton:
text:"Entrar"
pos_hint: {'center_x':0.5,'y':0.3}
on_press: root.screen_man.current="screen2"
Screen:
name:"screen2"
BoxLayout:
orientation:"vertical"
MDToolbar:
title:"C-19"
left_action_items: [["menu",lambda x: nav_drawer.set_state("open")]]
elevation: 10
pos_hint: {"top": 1}
ScreenManager:
id:screen_men
Screen:
name:"subscreen1"
scrole:scrole.__self__
cabeca_linhas1: cabeca_linhas1.__self__
head_lines2: head_lines2.__self__
head_lines3: head_lines3.__self__
foto_1: foto_1.__self__
image_2:image_2.__self__
image_3:image_3.__self__
ScrollView:
id:scrole
effect_cls: ScrollEffect
bar_width: 4
GridLayout:
id:box_sb1
cols:1
spacing: 80,80
size_hint_y: None
height: self.minimum_height
MDLabel:
text:"\\n"
MDCard:
orientation: "vertical"
padding: "8dp"
size_hint: None,None
size: "280dp","300dp"
pos_hint: {"center_x": .5,"center_y": .4}
AsyncImage:
id: foto_1
allow_stretch: True
size:"270dp","50dp"
source:""
MDLabel:
id:cabeca_linhas1
markup: True
text:""
MDCard:
orientation: "vertical"
padding: "8dp"
size_hint: None,"center_y": .3}
AsyncImage:
id: image_2
allow_stretch: True
size:"270dp","50dp"
source:""
MDLabel:
id: head_lines2
markup: True
text:""
MDCard:
orientation: "vertical"
padding: "8dp"
size_hint: None,"center_y": .1}
AsyncImage:
id:image_3
allow_stretch: True
size:"270dp","50dp"
source:""
MDLabel:
id:head_lines3
markup:True
text:""
MDLabel:
text:"\\n"
Screen:
name:"subscreen2"
MDTabs:
on_tab_switch: app.on_tab_switch(*args)
Tab:
text:"O Vírus"
Tab:
text:"Profilaxia"
Screen:
name:"subscreen3"
idade_user_:idade_user_
resposta_idade_:resposta_idade_
ScrollView:
GridLayout:
id:box_sb2
cols:1
spacing: 80,80
size_hint_y: None
height: self.minimum_height
MDTextField:
id:idade_user_
hint_text:"Digite sua idade-"
helper_text_mode: "on_focus"
pos_hint:{'center_x':0.5,'center_y':0.1}
input_filter: 'int'
max_text_length: 3
MDLabel:
text:"Verifique se tem alguma dessas doenças:"
MyListOfProbls:
OneLineListItem:
text:"1"
RightCheckbox:
MDRoundFlatButton:
text:"Resposta"
halign:"center"
pos_hint:{'center_x':0.5,'center_y':0.1}
on_press:root.resposta()
MDSeparator:
height:'3dp'
pos_hint:{'center_x':0.5,'center_y':0.4}
MDLabel:
id:resposta_idade_
text:""
pos_hint:{'x':0.3,'center_y':0.2}
halign:"center"
MDLabel:
text:""
MDNavigationDrawer:
id: nav_drawer
ContentNavigationDrawer:
screen_men:screen_man
screen_man:screen_men
nav_drawer:nav_drawer
<Tab>:
ScrollView:
GridLayout:
MDLabel:
id:my_test
halign:"center"
pos_hint:{'center_x':0.5,'center_y':0.7}
text:""
'''
class Tab(FloatLayout,MDTabsBase):
pass
class MyListOfProbls(OneLineListItem):
'''Custom list item.'''
class RightCheckbox(IRightBodyTouch,MDCheckbox):
'''Custom right container.'''
class ContentNavigationDrawer(BoxLayout):
screen_man = ObjectProperty()
screen_men = ObjectProperty()
nav_drawer = ObjectProperty()
idade_user_ = ObjectProperty(None)
resposta_idade_ = ObjectProperty(None)
class ScreenMain(Screen):
cabeca_linhas1 = ObjectProperty(None)
head_lines2 = ObjectProperty(None)
head_lines3 = ObjectProperty(None)
foto_1 = ObjectProperty(None)
image_2 = ObjectProperty(None)
image_3 = ObjectProperty(None)
def __init__(self,**kwargs):
super(ScreenMain,self).__init__(**kwargs)
Clock.schedule_once(self.on_enter)
def on_enter(self,*argm):
#First News
self.ids.cabeca_linhas1.text = titlen1
self.ids.foto_1.source = img1
#Second News
self.ids.head_lines2.text = titlen2
self.ids.image_2.source = img2
#Third News
self.ids.head_lines3.text = titlen3
self.ids.image_3.source = img3
def resposta(self,*args):
list_improprio=[""]
if len(str(self.ids.idade_user_.text)) > 3:
pass
elif str(self.ids.idade_user_.text) in list_improprio:
pass
elif int(float(self.ids.idade_user_.text)) > 50:
self.ids.resposta_idade_.text="GRUPO DE RISCO!"
elif int(float(self.ids.idade_user_.text)) < 0:
pass
else:
self.ids.resposta_idade_.text = "Fora do grupo de risco."
#MDApp Class
class TestNavigationDrawer(MDApp):
def build(self):
self.theme_cls.primary_palette = "Blue"
return Builder.load_string(Kv_string)
def on_tab_switch(self,instance_tabs,instance_tab,instance_tab_label,tab_text):
if tab_text == "O Vírus":
instance_tab.ids.my_test.text = "1" #MUDAR O TEXT
elif tab_text == "Profilaxia":
instance_tab.ids.my_test.text = "Lave suas mãos com frequência. Use sabão e água ou álcool em gel. Mantenha uma distância segura de pessoas que estiverem tossindo ou espirrando. Use máscara quando não for possível manter o distanciamento físico. Não toque nos olhos,no nariz ou na boca. Cubra seu nariz e boca com o braço dobrado ou um lenço ao tossir ou expirar. Fique em casa se você se sentir indisposto. Procure atendimento médico se tiver febre,tosse e dificuldade para respirar. São medidas adotadas para a prevenção e propagação da covid-19,que apesar de não lhe tornar imune ao vírus,diminui chances de propagação,e vem dando certo em diversos países,que a quarentena foi seguida corretamente,como na Itália,que sofria com muitos casos,mas com essas medidas o número de casos diminuíram dramaticamente" #MUDAR O TEXT
TestNavigationDrawer().run()
在代码的这一部分，有一种供人们进行的调查，以便他们可以确定自己是否属于风险组。
GridLayout:
id:box_sb2
cols:1
spacing: 80,'center_y':0.2}
halign:"center"
MDLabel:
text:""
当我运行它时，输出是这样的： enter image description here
您看到某些元素没有居中吗？就像按钮“ Resposta”一样。 MDList也有些bug。那么，我该如何解决？
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