我在Google的Firebase上有一个数据库,可以很好地工作,我可以轻松地将数据保存在那里。我想为我的应用返回此数据,但是在遇到问题之前,我无法在Kivy上列出任何内容。
我想使用Kivy的ListView,但是在文档中建议使用RecycleView。但是我看不懂文档。我有些怀疑。
如果您可以阅读RecycleView的文档,您将看到以下示例:
Builder.load_string('''
<RV>:
viewclass: 'Label'
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
''')
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
self.data = [{'text': str(x)} for x in range(100)]
class TestApp(App):
def build(self):
return RV()
if __name__ == '__main__':
TestApp().run()
但是我使用ScreenManager来控制屏幕,然后在TestApp类中返回“ sm”,如文档示例所示:
# Declare both screens
class MenuScreen(Screen):
pass
class SettingsScreen(Screen):
pass
# Create the screen manager
sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(SettingsScreen(name='settings'))
class TestApp(App):
def build(self):
return sm
if __name__ == '__main__':
TestApp().run()
如果您看到语法不同,那么在这里我不知道该如何编码。我想继续使用ScreenManager来控制屏幕,并使用RecycleView返回列表中的数据。
如何将RecycleView与ScreenManager一起使用?这是我的main.py,在另一个文档中配置屏幕,我也使用ki语言。因此,如果大家能为我做榜样,我将不胜感激。
import kivy
from kivy.app import App, Builder
from kivy.config import Config
from kivy.uix.screenmanager import ScreenManager
from telas.telas import Acesso, Comprando, Vendendo, CadastrarEvento
kivy.require('1.10.1')
Builder.load_file('ing.kv')
Config.read('config.ini')
sm = ScreenManager()
sm.add_widget(Acesso(name='acesso'))
sm.add_widget(Comprando(name='comprando'))
sm.add_widget(Vendendo(name='vendendo'))
sm.add_widget(CadastrarEvento(name='cadastrarEvento'))
sm.add_widget(ListaEventos(name='listaEventos'))
class IngApp(App):
def build(self):
return sm
if __name__ == '__main__':
IngApp().run()
这是我第一次尝试的kv
<ListaEventos>:
canvas:
Rectangle:
source: 'design/fundo.png'
size: self.width, self.height
viewclass: 'Label'
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
ListaEventos:
class ListaEvento(Screen, RecycleView):
def __init__(self, **kwargs):
super(ListaEvento, self).__init__(**kwargs)
self.data = [{'text': str(x)} for x in range(20)]
答案 0 :(得分:0)
您不应该继承2个小部件,但是将绘制什么小部件?例如,如果要让图像表现得像按钮,则必须从Image小部件和ButtonBehavior类继承,即,从视觉上看,它是图像,但添加了按钮行为。
因此,要解决您的问题,使用继承不是正确的方法,而是使用构成,即将RecyclerView添加为Screen的儿子。
*。py
import kivy
from kivy.app import App, Builder
from kivy.config import Config
from kivy.uix.screenmanager import ScreenManager, Screen
class ListaEventos(Screen):
def __init__(self, **kwargs):
super(ListaEventos, self).__init__(**kwargs)
# assigning data in RecyclerView
self.rv.data = [{'text': str(x)} for x in range(100)]
kivy.require('1.10.1')
Builder.load_file('ing.kv')
Config.read('config.ini')
sm = ScreenManager()
sm.add_widget(ListaEventos(name='listaEventos'))
class IngApp(App):
def build(self):
return sm
if __name__ == '__main__':
IngApp().run()
ing.kv
<ListaEventos>:
rv: rv # expose the widget
canvas:
Rectangle:
source: 'design/fundo.png'
size: self.width, self.height
RecycleView:
id: rv
viewclass: 'Label'
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'