这是主要的.py
from kivy.app import App
class WeatherApp(App):
pass
if __name__ == '__main__':
WeatherApp().run()
天气.kv 是:AddLocationForm:
<AddLocationForm@BoxLayout>:
orientation: 'vertical'
BoxLayout:
TextInput:
Button:
text: "Search"
Button:
text: "Current Location"
ListView:
item_strings: ["Palo Alto, MX", "Palo Alto, US"]
它似乎无法识别 ListView 。我已经看到其他使用带有“from kivy.uix.listview import ListView”的 ListView ,但这也不起作用,我不知道为什么。kivy.factory.FactoryException:未知类
最佳答案
Kivy ListView » 已弃用
最近发布的稳定版 Kivy 1.11.0 中不再定义 ListView。
Kivy RecycleView » MVC ( Model-View-Controller )
The view is generatad by processing the data, essentially a list of dicts, and uses these dicts to generate instances of the viewclass as required. Its design is based on the MVC (Model-view-controller) pattern.
- Model: The model is formed by data you pass in via a list of dicts.
- View: The View is split across layout and views and implemented using adapters.
- Controller: The controller determines the logical interaction and is implemented by RecycleViewBehavior.
解决方案
要创建可选项目的 RecycleView,将以下类作为 viewclass 的一部分实现.该项目通常是一个小部件,例如Label , Button ,或布局中的一组/行小部件( BoxLayout 或 GridLayout )。
View 类
SelectableRecycleBoxLayout()
, 或 SelectableRecycleGridLayout()
SelectableLabel()
, SelectableButton()
, 或 SelectableRow()
数据
例子
下面的示例通过使用 RecycleView 说明了 ListView 的等效性。 viewclass是可选的 RecycleBoxLayout的 Label小部件。该应用程序正在使用 OpenWeatherMap的 API检索英国伦敦的样本天气数据(英国)。
笔记:
要使用真正的 API 点调用 OpenWeatherMap,您需要一个 API key (APPID) .
主文件
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty, ObjectProperty
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from kivy.network.urlrequest import UrlRequest
from kivy.lang import Builder
import json
class SelectableRecycleBoxLayout(FocusBehavior, LayoutSelectionBehavior,
RecycleBoxLayout):
''' Adds selection and focus behaviour to the view. '''
class SelectableLabel(RecycleDataViewBehavior, Label):
''' Add selection support to the Label '''
index = None
selected = BooleanProperty(False)
selectable = BooleanProperty(True)
def refresh_view_attrs(self, rv, index, data):
''' Catch and handle the view changes '''
self.index = index
return super(SelectableLabel, self).refresh_view_attrs(
rv, index, data)
def on_touch_down(self, touch):
''' Add selection on touch down '''
if super(SelectableLabel, self).on_touch_down(touch):
return True
if self.collide_point(*touch.pos) and self.selectable:
return self.parent.select_with_touch(self.index, touch)
def apply_selection(self, rv, index, is_selected):
''' Respond to the selection of items in the view. '''
self.selected = is_selected
class AddLocationForm(BoxLayout):
search_input = ObjectProperty()
search_results = ObjectProperty()
def search_location(self):
search_template = "https://samples.openweathermap.org/data/2.5/find?q={}&appid=b6907d289e10d714a6e88b30761fae22"
# search_template = "https://api.openweathermap.org/data/2.5/find?q={}&typle=like&appid=xyz" # Replace 'xyz' with your API Key (APPID)
search_url = search_template.format(self.search_input.text)
request = UrlRequest(search_url, self.found_location)
def found_location(self, request, data):
data = json.loads(data.decode()) if not isinstance(data, dict) else data
cities = ["{} ({})".format(d['name'], d['sys']['country']) for d in data['list']]
self.search_results.data = [{'text': str(x)} for x in cities]
print(f"self.search_results.data={self.search_results.data}")
class WeatherRoot(BoxLayout):
pass
class TestApp(App):
title = "Weather App"
def build(self):
return Builder.load_file("main.kv")
if __name__ == '__main__':
TestApp().run()
主文件
WeatherRoot:
<WeatherRoot>:
AddLocationForm:
<SelectableLabel>:
# Draw a background to indicate selection
canvas.before:
Color:
rgba: (1, 0, 0, 1) if self.selected else (.0, 0.9, .1, .3)
Rectangle:
pos: self.pos
size: self.size
Color:
rgba: (0, 0.9, .1, .3)
Rectangle:
pos: self.pos
size: self.size
<AddLocationForm>:
orientation: "vertical"
search_input: search_input
search_results: search_results_list
BoxLayout:
height: "40dp"
size_hint_y:None
TextInput:
id: search_input
size_hint_x: 50
focus: True
multiline: False
hint_text: 'Your city name'
on_text_validate: root.search_location()
Button:
text: "Search"
size_hint_x: 25
on_press: root.search_location()
Button:
text: "Current Location"
size_hint_x: 25
RecycleView:
id: search_results_list
viewclass: 'SelectableLabel'
SelectableRecycleBoxLayout:
default_size: None, dp(26)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
multiselect: True
touch_multiselect: True
输出
关于Kivy:未知类 <ListView> 错误代码,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56601384/