Kivy：未知 class <ListView> 错误代码
Kivy: Unknown class <ListView> error code
这是main.py
from kivy.app import App
class WeatherApp(App):
pass
if __name__ == '__main__':
WeatherApp().run()
weather.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"]
它似乎无法识别列表视图。我看到其他使用“from kivy.uix.listview import ListView”的列表视图，但这也不起作用，我不知道为什么。
kivy.factory.FactoryException：未知 class
Kivy ListView » 已弃用
最近发布的稳定版 Kivy 1.11.0 中不再定义 ListView。
基维 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，请实施以下 classes 作为 viewclass. The item is usually a widget e.g. Label, Button, or a group/row of widgets in a layout (BoxLayout or GridLayout) 的一部分。
查看class
- 选择回收布局 class，例如
SelectableRecycleBoxLayout()，或SelectableRecycleGridLayout()
- 可选择的小部件class，例如
SelectableLabel()、SelectableButton() 或 SelectableRow()
数据
- 为 data
创建一个字典列表
例子
以下示例通过使用 RecycleView 说明了 ListView 的等效性。 viewclass is a selectable RecycleBoxLayout of Label widget. The app is using OpenWeatherMap's API 检索伦敦，GB（英国）的示例天气数据。
注：
要使用真实的 API 点调用 OpenWeatherMap，您需要 API key (APPID).
main.py
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()
main.kv
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
我用以下方法解决这个问题：
main.py
from kivy.app import App
from kivy.uix.recycleview import RecycleView
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
self.data = [{'text': str(values)} for values in ["Palo Alto, MX", "Palo Alto, US"]]
class WeatherAPP(App):
pass
if __name__ == '__main__':
WeatherAPP().run()
weather.kv
#:kivy 1.10
AddLocationForm:
<AddLocationForm@BoxLayout>:
orientation: 'vertical'
BoxLayout:
TextInput:
Button:
text: "Search"
Button:
text: "Current Location"
RV:
viewclass: 'Label'
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
这是main.py
from kivy.app import App
class WeatherApp(App):
pass
if __name__ == '__main__':
WeatherApp().run()
weather.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"]
它似乎无法识别列表视图。我看到其他使用“from kivy.uix.listview import ListView”的列表视图，但这也不起作用，我不知道为什么。
kivy.factory.FactoryException：未知 class
Kivy ListView » 已弃用
最近发布的稳定版 Kivy 1.11.0 中不再定义 ListView。
基维 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，请实施以下 classes 作为 viewclass. The item is usually a widget e.g. Label, Button, or a group/row of widgets in a layout (BoxLayout or GridLayout) 的一部分。
查看class
- 选择回收布局 class，例如
SelectableRecycleBoxLayout()，或SelectableRecycleGridLayout() - 可选择的小部件class，例如
SelectableLabel()、SelectableButton()或SelectableRow()
数据
- 为 data 创建一个字典列表
例子
以下示例通过使用 RecycleView 说明了 ListView 的等效性。 viewclass is a selectable RecycleBoxLayout of Label widget. The app is using OpenWeatherMap's API 检索伦敦，GB（英国）的示例天气数据。
注：
要使用真实的 API 点调用 OpenWeatherMap，您需要 API key (APPID).
main.py
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()
main.kv
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
我用以下方法解决这个问题：
main.py
from kivy.app import App
from kivy.uix.recycleview import RecycleView
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
self.data = [{'text': str(values)} for values in ["Palo Alto, MX", "Palo Alto, US"]]
class WeatherAPP(App):
pass
if __name__ == '__main__':
WeatherAPP().run()
weather.kv
#:kivy 1.10
AddLocationForm:
<AddLocationForm@BoxLayout>:
orientation: 'vertical'
BoxLayout:
TextInput:
Button:
text: "Search"
Button:
text: "Current Location"
RV:
viewclass: 'Label'
RecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'