kivy mapview on screenmanager - python-3.x

Question

I have tried first my mapview function with only the mapview in the build which worked, but I had to return in the build mapview. Then I tried having the mapview on my first screen, and I face problems with it:
import kivy
from kivy.app import App
from kivy.uix.label import Label as label
from kivy.uix.screenmanager import Screen, ScreenManager
from kivy.uix.button import Button as button
from kivy.uix.gridlayout import GridLayout as gl
from kivy.uix.textinput import TextInput as ti
from kivy.garden.mapview import MapView
from kivy.garden.mapview import MapMarkerPopup
import os
kivy.require("1.11.1")
#first screen page
class Mapspage(Screen,MapView,gl):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.cols=1
marker=MapMarkerPopup(lat=55.6928595,lon=12.5992828)
self.abouting=button(text="lil'mermaid")
self.abouting.bind(on_press=self.pressbutton())
marker.add_widget(self.abouting)
mapview=MapView(zoom=12, lat=55.6712674, lon=12.5938239)
mapview.add_marker(marker)
def pressbutton(self):
chatapp.screenmanager.current="About"
#button leads to about page
class Aboutpage(Screen,gl):
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.cols=1
self.message=label(text="yup dissapointingly small",halign="center",valign="middle",fontsize=30)
self.message.bind(width=self.utw())
self.add_widget(self.message)
def utw(self, *_):
self.message.text_size=(self.message.width*0.9,None)
#updatetextwidth
class Epicapp(App):
def build(self):
self.screenmanager=ScreenManager()
self.mapspage=Mapspage()
screen=Screen(name="places")
screen.add_widget(self.mapspage)
self.screenmanager.add_widget(screen)
self.aboutpage=Aboutpage()
screen=Screen(name="About")
screen.add_widget(self.aboutpage)
self.screenmanager.add_widget(screen)
return self.screenmanager
if __name__=="__main__":
chatapp=Epicapp()
chatapp.run()
I get as an error message this:
[INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
Traceback (most recent call last):
File "<ipython-input-1-4a0782fed14b>", line 1, in <module>
runfile('/home/pi/Documents/learningkivy.py', wdir='/home/pi/Documents')
File "/usr/lib/python3/dist-packages/spyder_kernels/customize/spydercustomize.py", line 678, in runfile
execfile(filename, namespace)
File "/usr/lib/python3/dist-packages/spyder_kernels/customize/spydercustomize.py", line 106, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "/home/pi/Documents/learningkivy.py", line 70, in <module>
chatapp.run()
File "/usr/local/lib/python3.7/dist-packages/kivy/app.py", line 829, in run
root = self.build()
File "/home/pi/Documents/learningkivy.py", line 54, in build
self.mapspage=Mapspage()
File "/home/pi/Documents/learningkivy.py", line 28, in __init__
super().__init__(**kwargs)
File "/usr/local/lib/python3.7/dist-packages/kivy/uix/relativelayout.py", line 265, in __init__
super(RelativeLayout, self).__init__(**kw)
File "/usr/local/lib/python3.7/dist-packages/kivy/uix/floatlayout.py", line 65, in __init__
super(FloatLayout, self).__init__(**kwargs)
File "/home/pi/.kivy/garden/garden.mapview/mapview/view.py", line 526, in __init__
self.add_widget(self._scatter)
File "/usr/local/lib/python3.7/dist-packages/kivy/uix/floatlayout.py", line 139, in add_widget
pos_hint=self._trigger_layout)
File "kivy/_event.pyx", line 419, in kivy._event.EventDispatcher.bind
AssertionError: None is not callable
Not really helpfull error message, but I am guessing it is not happy with the
super.__init__
function, yet without it, it will not know about the about page.

Answer 1

Here is a version of your code that mostly works:
import kivy
from kivy.app import App
from kivy.uix.label import Label as label
from kivy.uix.screenmanager import Screen, ScreenManager
from kivy.uix.button import Button as button
from kivy.uix.gridlayout import GridLayout
from kivy.garden.mapview import MapView
from kivy.garden.mapview import MapMarkerPopup
kivy.require("1.11.1")
# first screen page
class Mapspage(Screen):
def __init__(self, **kwargs):
super(Mapspage, self).__init__(**kwargs)
gl = GridLayout(cols=1)
marker = MapMarkerPopup(lat=55.6928595, lon=12.5992828)
self.abouting = button(text="lil'mermaid")
self.abouting.bind(on_press=self.pressbutton)
mapview = MapView(zoom=12, lat=55.6712674, lon=12.5938239)
mapview.add_marker(marker)
gl.add_widget(mapview)
gl.add_widget(self.abouting)
self.add_widget(gl)
def pressbutton(self, *args):
chatapp.screenmanager.current = "About"
# button leads to about page
class Aboutpage(Screen):
def __init__(self, **kwargs):
super(Aboutpage, self).__init__(**kwargs)
gl = GridLayout(cols=1)
self.message = label(text="yup dissapointingly small", halign="center", valign="middle", font_size=30)
self.message.bind(width=self.utw)
gl.add_widget(self.message)
self.add_widget(gl)
def utw(self, *_):
self.message.text_size = (self.message.width * 0.9, None)
# updatetextwidth
class Epicapp(App):
def build(self):
self.screenmanager = ScreenManager()
self.mapspage = Mapspage(name="places")
self.screenmanager.add_widget(self.mapspage)
self.aboutpage = Aboutpage(name="About")
self.screenmanager.add_widget(self.aboutpage)
return self.screenmanager
if __name__ == "__main__":
chatapp = Epicapp()
chatapp.run()
A couple notes about errors encountered in your original code:
When you use bind or on_press (or any event binding) you should bind to a method. If you bind to something like self.utw(), you are executing the self.utw() method and trying to bind to whatever that method returns. You should bind to the method, not its return, like this: self.message.bind(width=self.utw).
In a Label, the font size is set using font_size not fontsize.
In the above code, MapsPage is a Screen that contains a GridLayout. That GridLayout contains a MapView and a Button.
The AboutPage is also a Screen, and it contains a GridLayout that contains a Label.
The build() method is simplified, since both MapsPage and AboutPage are Screens, there is no need to create additional Screens just to contain them.
The error message in your post is caused by the self.pressbutton() call in the __init__() method of MapsPage.