kivy启动时如何从json文件自动加载数据
How to automatically load data from json file on startup with kivy
我正在用 python 和 kivy 制作一个 android 应用程序，它可以跟踪糖尿病条目并有一个基本的个人资料页面。我想出了如何将来自 textinput 小部件的输入保存到一个工作正常的 json 文件中。但是我无法弄清楚如何在启动时自动将此信息加载回 textinput widets。加载到标签中也可以，但会比较草率。我知道有一个 on_start 模块，但我不知道如何使用它。任何建议将不胜感激。
.kv 文件
<Phone>:
result: _result
h: _h
w: _w
n: name_input
g: gender_input
t: _type
ti: _times
m: _meds
AnchorLayout:
anchor_x: 'center'
anchor_y: 'top'
ScreenManager:
size_hint: 1, .9
id: _screen_manager
Screen:
name: 'home'
canvas.before:
Rectangle:
pos: self.pos
size: self.size
source: "/home/aaron/Desktop/main.png"
Label:
markup: True
text: '[size=100][color=ff3333]Welcome to [color=ff3333]Diabetes Manager[/color][/size]'
Screen:
name: 'menu'
GridLayout:
cols: 2
padding: 50
canvas.before:
Rectangle:
pos: self.pos
size: self.size
source: "/home/aaron/Desktop/main.png"
Button:
text: 'My Profile'
on_press: _screen_manager.current = 'profile'
Button:
text: 'History'
on_press: _screen_manager.current = 'history'
Button:
text: 'New Entry'
on_press: _screen_manager.current = 'new_entry'
Button:
text: 'Graph'
on_press: _screen_manager.current = 'graph'
Button:
text: 'Diet'
on_press: _screen_manager.current = 'diet'
Button:
text: 'Settings'
on_press: _screen_manager.current = 'settings'
Screen:
name: 'profile'
GridLayout:
cols: 1
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Name[/color][/size]'
TextInput:
id: name_input
hint_text: 'Name'
Button:
size_hint_x: 0.15
text: 'Load'
on_press: root.load()
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Gender[/color][/size]'
TextInput:
id: gender_input
hint_text: 'Gender'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=34][color=0000ff]Type of Diabetes[/color][/size]'
TextInput:
id: _type
hint_text: 'Type of Diabetes'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Height (in)[/color][/size]'
TextInput:
id: _h
hint_text: 'Height in inches'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Weight (lb)[/color][/size]'
TextInput:
id: _w
hint_text: 'Weight in pounds'
BoxLayout:
Button:
text: 'Calculate BMI'
on_press: root.product(*args)
Label:
size_hint_x: 4.5
id:_result
bold: True
markup: True
text: '[size=40][color=0000ff]BMI[/color][/size]'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=30][color=0000ff]List of Medications[/color][/size]'
TextInput:
id: _meds
hint_text: 'List of Medications'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=38][color=0000ff]Insulin Times[/color][/size]'
TextInput:
id: _times
hint_text: 'Please Enter Times to Take Insulin'
Button:
size_hint_x: 0.15
text: 'Done'
on_press: root.save()
Screen:
name: 'history'
GridLayout:
cols:1
Screen:
name: 'new_entry'
GridLayout:
cols:1
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Time[/color][/size]'
TextInput:
id: _time
hint_text: 'Current Time'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=28][color=0000ff]Blood Sugar (mg/dL)[/color][/size]'
TextInput:
id: _glucose_reading
hint_text: 'Current Blood Sugar'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Carbs[/color][/size]'
TextInput:
id: _food
hint_text: 'Total Carbs for meal'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=30][color=0000ff]Medications Taken[/color][/size]'
TextInput:
id: _meds_taken
hint_text: 'Please Enter Any Medications Taken'
Screen:
name: 'graph'
GridLayout:
cols: 3
padding: 50
Label:
markup: True
text: '[size=24][color=dd88ff]Your Graph[/color][/size]'
Screen:
name: 'diet'
GridLayout:
cols: 3
padding: 50
Label:
markup: True
text: '[size=24][color=dd88ff]Reccomended Diet[/color][/size]'
Screen:
name: 'settings'
GridLayout:
cols: 3
padding: 50
Label:
markup: True
text: '[size=24][color=dd88ff]Settings[/color][/size]'
AnchorLayout:
anchor_x: 'center'
anchor_y: 'bottom'
BoxLayout:
orientation: 'horizontal'
size_hint: 1, .1
Button:
id: btnExit
text: 'Exit'
on_press: app.save(_name.text, gender.txt)
Button:
text: 'Menu'
on_press: _screen_manager.current = 'menu'
.py
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.graphics import Color, Rectangle
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.image import AsyncImage
from kivy.uix.label import Label
from kivy.properties import StringProperty, ListProperty
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.textinput import TextInput
from kivy.network.urlrequest import UrlRequest
from kivy.storage.jsonstore import JsonStore
from os.path import join
from os.path import exists
from kivy.compat import iteritems
from kivy.storage import AbstractStore
from json import loads, dump
from kivy.config import Config
class Phone(FloatLayout):
def __init__(self, **kwargs):
# make sure we aren't overriding any important functionality
super(Phone, self).__init__(**kwargs)
with self.canvas.before:
Color(0, 1, 0, 1) # green; colors range from 0-1 instead of 0-255
self.rect = Rectangle(size=self.size, pos=self.pos)
self.bind(size=self._update_rect, pos=self._update_rect)
def _update_rect(self, instance, value):
self.rect.pos = instance.pos
self.rect.size = instance.size
def product(self, instance):
self.result.text = str(float(self.w.text) * 703/ (float(self.h.text) * float(self.h.text)))
def save(self):
store = JsonStore('hello.json')
name = self.n.text
gender = self.g.text
dtype = self.t.text
height = self.h.text
weight = self.w.text
medications = self.m.text
store.put('profile', name=name, gender=gender, dtpe=dtype, height=height, weight=weight, medications=medications)
presentation = Builder.load_file("main.kv")
class PhoneApp(App):
def build(self):
store = JsonStore('hello.json')
return Phone()
if __name__ == '__main__':
PhoneApp().run()
您可以做与您在 save() 中已经做的相反的事情。例如：
def load(self):
store = JsonStore('hello.json')
profile = store.get('profile')
self.n.text = profile['name']
self.g.text = profile['gender']
...
然后在某处调用那个方法，比如 __init__().
我正在用 python 和 kivy 制作一个 android 应用程序，它可以跟踪糖尿病条目并有一个基本的个人资料页面。我想出了如何将来自 textinput 小部件的输入保存到一个工作正常的 json 文件中。但是我无法弄清楚如何在启动时自动将此信息加载回 textinput widets。加载到标签中也可以，但会比较草率。我知道有一个 on_start 模块，但我不知道如何使用它。任何建议将不胜感激。
.kv 文件
<Phone>:
result: _result
h: _h
w: _w
n: name_input
g: gender_input
t: _type
ti: _times
m: _meds
AnchorLayout:
anchor_x: 'center'
anchor_y: 'top'
ScreenManager:
size_hint: 1, .9
id: _screen_manager
Screen:
name: 'home'
canvas.before:
Rectangle:
pos: self.pos
size: self.size
source: "/home/aaron/Desktop/main.png"
Label:
markup: True
text: '[size=100][color=ff3333]Welcome to [color=ff3333]Diabetes Manager[/color][/size]'
Screen:
name: 'menu'
GridLayout:
cols: 2
padding: 50
canvas.before:
Rectangle:
pos: self.pos
size: self.size
source: "/home/aaron/Desktop/main.png"
Button:
text: 'My Profile'
on_press: _screen_manager.current = 'profile'
Button:
text: 'History'
on_press: _screen_manager.current = 'history'
Button:
text: 'New Entry'
on_press: _screen_manager.current = 'new_entry'
Button:
text: 'Graph'
on_press: _screen_manager.current = 'graph'
Button:
text: 'Diet'
on_press: _screen_manager.current = 'diet'
Button:
text: 'Settings'
on_press: _screen_manager.current = 'settings'
Screen:
name: 'profile'
GridLayout:
cols: 1
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Name[/color][/size]'
TextInput:
id: name_input
hint_text: 'Name'
Button:
size_hint_x: 0.15
text: 'Load'
on_press: root.load()
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Gender[/color][/size]'
TextInput:
id: gender_input
hint_text: 'Gender'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=34][color=0000ff]Type of Diabetes[/color][/size]'
TextInput:
id: _type
hint_text: 'Type of Diabetes'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Height (in)[/color][/size]'
TextInput:
id: _h
hint_text: 'Height in inches'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Weight (lb)[/color][/size]'
TextInput:
id: _w
hint_text: 'Weight in pounds'
BoxLayout:
Button:
text: 'Calculate BMI'
on_press: root.product(*args)
Label:
size_hint_x: 4.5
id:_result
bold: True
markup: True
text: '[size=40][color=0000ff]BMI[/color][/size]'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=30][color=0000ff]List of Medications[/color][/size]'
TextInput:
id: _meds
hint_text: 'List of Medications'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=38][color=0000ff]Insulin Times[/color][/size]'
TextInput:
id: _times
hint_text: 'Please Enter Times to Take Insulin'
Button:
size_hint_x: 0.15
text: 'Done'
on_press: root.save()
Screen:
name: 'history'
GridLayout:
cols:1
Screen:
name: 'new_entry'
GridLayout:
cols:1
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Time[/color][/size]'
TextInput:
id: _time
hint_text: 'Current Time'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=28][color=0000ff]Blood Sugar (mg/dL)[/color][/size]'
TextInput:
id: _glucose_reading
hint_text: 'Current Blood Sugar'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=40][color=0000ff]Carbs[/color][/size]'
TextInput:
id: _food
hint_text: 'Total Carbs for meal'
BoxLayout:
Label:
size_hint_x: 0.22
bold: True
markup: True
text: '[size=30][color=0000ff]Medications Taken[/color][/size]'
TextInput:
id: _meds_taken
hint_text: 'Please Enter Any Medications Taken'
Screen:
name: 'graph'
GridLayout:
cols: 3
padding: 50
Label:
markup: True
text: '[size=24][color=dd88ff]Your Graph[/color][/size]'
Screen:
name: 'diet'
GridLayout:
cols: 3
padding: 50
Label:
markup: True
text: '[size=24][color=dd88ff]Reccomended Diet[/color][/size]'
Screen:
name: 'settings'
GridLayout:
cols: 3
padding: 50
Label:
markup: True
text: '[size=24][color=dd88ff]Settings[/color][/size]'
AnchorLayout:
anchor_x: 'center'
anchor_y: 'bottom'
BoxLayout:
orientation: 'horizontal'
size_hint: 1, .1
Button:
id: btnExit
text: 'Exit'
on_press: app.save(_name.text, gender.txt)
Button:
text: 'Menu'
on_press: _screen_manager.current = 'menu'
.py
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.graphics import Color, Rectangle
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.image import AsyncImage
from kivy.uix.label import Label
from kivy.properties import StringProperty, ListProperty
from kivy.uix.behaviors import ButtonBehavior
from kivy.uix.textinput import TextInput
from kivy.network.urlrequest import UrlRequest
from kivy.storage.jsonstore import JsonStore
from os.path import join
from os.path import exists
from kivy.compat import iteritems
from kivy.storage import AbstractStore
from json import loads, dump
from kivy.config import Config
class Phone(FloatLayout):
def __init__(self, **kwargs):
# make sure we aren't overriding any important functionality
super(Phone, self).__init__(**kwargs)
with self.canvas.before:
Color(0, 1, 0, 1) # green; colors range from 0-1 instead of 0-255
self.rect = Rectangle(size=self.size, pos=self.pos)
self.bind(size=self._update_rect, pos=self._update_rect)
def _update_rect(self, instance, value):
self.rect.pos = instance.pos
self.rect.size = instance.size
def product(self, instance):
self.result.text = str(float(self.w.text) * 703/ (float(self.h.text) * float(self.h.text)))
def save(self):
store = JsonStore('hello.json')
name = self.n.text
gender = self.g.text
dtype = self.t.text
height = self.h.text
weight = self.w.text
medications = self.m.text
store.put('profile', name=name, gender=gender, dtpe=dtype, height=height, weight=weight, medications=medications)
presentation = Builder.load_file("main.kv")
class PhoneApp(App):
def build(self):
store = JsonStore('hello.json')
return Phone()
if __name__ == '__main__':
PhoneApp().run()
您可以做与您在 save() 中已经做的相反的事情。例如：
def load(self):
store = JsonStore('hello.json')
profile = store.get('profile')
self.n.text = profile['name']
self.g.text = profile['gender']
...
然后在某处调用那个方法，比如 __init__().