from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.textinput import TextInput
from kivy.network.urlrequest import UrlRequest
from urllib import urlencode
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.camera import Camera
sm = ScreenManager()
sm.add_widget(MainScreen(name = "mainscreen"))
sm.add_widget(CameraScreen(name = "camerascreen"))
class Test(App):
	def build(self):
		global sm
		return sm
class MainScreen(Screen):
	def build(self):
		global sm
		self.name = name
		l = FloatLayout()
		camera_button = Button(size_hint = (.2, .2), pos_hint = {"x": .4, "y": .4}, on_press = sm.camerascreen("camerascreen"))
		l.add_widget(camera_button)
		return l
class CameraScreen(Screen):
	def build(self):
		self.name = name
		camw = FloatLayout()
		cam = Camera()
		cam.play = True
		cam.size_hint = (1, 1)
		camw.add_widget(cam)
		return camw
Test().run()