kivy==master Window undefined

[RobertFlatt]

Versions

• Python: 3.6
• OS: Ubuntu 18.04
• Kivy: master
• Cython: 29.1

Description

Using python-for-android (master) downloaded 2/6/2019 (same with 2/2/2019)
Issue with kivy==master
This example crashes on Android load at main.py line 16
Log shows Window as NoneType object.

from kivy.app import App
from kivy.uix.label import Label
from kivy.graphics import Color, Rectangle
from kivy.core.window import Window

class Demo(App):
    def set_background_color(self):
        with self.label.canvas.before:
            Color(0.5, 0.0, 0.5)
            Rectangle(size=Window.size) 
       
    def _resize_handler(self,obj,size):
        self.set_background_color()

    def build(self):
        foo = Window.size                      ##### <<<<< Line 16
        Window.bind(size=self._resize_handler)
        self.label = Label(text = 'Greetings Earthlings')
        self.set_background_color()
        return self.label

if __name__ == '__main__':
    Demo().run()

buildozer.spec

Command:

1) Kivy==master produces crash:
p4a clean_all
p4a apk --requirements=python3,kivy==master

2) Kivy default produces no crash
p4a clean_all
p4a apk --requirements=python3,kivy

3) Kivy==master as a change to default (so no clean_all before) produces no crash
p4a apk --requirements=python3,kivy==master

.p4a file:

--dist_name=ex
--private .
--package=com.example.ex
--name Ex
--arch=armeabi-v7a
--orientation sensor
--sdk_dir /home/bobf/androidtools/sdk
--ndk_dir /home/bobf/androidtools/android-ndk-r17c
--android_api 28
--ndk-api 21
--version 0.0.0

Logs

02-06 13:01:54.057 26517 26548 I python  :    File "/mnt/c/users/bobf/documents/pm/tst2/main.py", line 16, in build
02-06 13:01:54.057 26517 26548 I python  :  AttributeError: 'NoneType' object has no attribute 'size'
02-06 13:01:54.057 26517 26548 I python  : Python for android ended.

[OptimusGREEN]

These appear to be linked/same issue
kivy/kivy#6136