Kivy crashtest code

#!/usr/bin/env python

import kivy
kivy.require('1.3.0')

from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.widget import Widget
from kivy.graphics import Color, Rectangle, Callback
from kivy.core.window import Window
from kivy.clock import Clock

class PlayScreen(Widget):
    def __init__(self, **kwargs):
        super(PlayScreen, self).__init__(**kwargs)

        with self.canvas:
            Color(1, 1, 1)
            Rectangle(size=Window.size)

            self.fpslabel = Label(text='X fps', color=[0, 0, 0, 1])
            Callback(self.setfps)

    def setfps(self, instr):
        self.fpslabel.text = "{0:.2f} fps".format(Clock.get_fps())

    def on_touch_move(self, touch):
        with self.canvas:
            Color(0, 0, 0, 0.1)
            Rectangle(pos=(touch.x, touch.y), size=(10, 10))

class MyApp(App):
    def build(self):
        return PlayScreen()

if __name__ in ('__main__', '__android__'):
    MyApp().run()