Initial commit.

.gitignore

+.idea
+*.pyc
+*.pyo
+*.apk

first_screen.kv

+<FirstScreen>:
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            text: 'This is the first screen.'
+        Button:
+            text: 'This button prints a number.'
+            on_press: root.print_number()
+        Button:
+            text: 'Change…'
+            on_press: app.open_second_screen()

first_screen.py

+from kivy.lang import Builder
+from kivy.uix.screenmanager import Screen
+from kivy.properties import NumericProperty
+
+
+Builder.load_file('first_screen.kv')
+
+
+class FirstScreen(Screen):
+    number = NumericProperty(0)
+
+    def print_number(self):
+        print(self.number)
+        self.number += 1

main.py

+from kivy.app import App
+
+# noinspection PyUnresolvedReferences
+from first_screen import FirstScreen
+# noinspection PyUnresolvedReferences
+from second_screen import SecondScreen
+
+
+__app_package__ = 'edu.unl.cse.soft161.two_screen'
+__app__ = 'Two-Screen App'
+__version__ = '1.0'
+__flags__ = ['--bootstrap=sdl2', '--requirements=python2,kivy', '--orientation=landscape']
+
+
+class TwoScreenApp(App):
+    def open_first_screen(self):
+        self.root.transition.direction = 'right'
+        self.root.current = 'first'
+
+    def open_second_screen(self):
+        self.root.transition.direction = 'left'
+        self.root.current = 'second'
+
+
+if __name__ == '__main__':
+    app = TwoScreenApp()
+    app.run()

second_screen.kv

+<SecondScreen>:
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            text: 'This is the second screen.'
+        Label:
+            text: root.message
+        Button:
+            text: 'Change…'
+            on_press: app.open_first_screen()

second_screen.py

+from kivy.lang import Builder
+from kivy.uix.screenmanager import Screen
+from kivy.properties import StringProperty
+
+
+Builder.load_file('second_screen.kv')
+
+
+class SecondScreen(Screen):
+    message = StringProperty('Hello, World!')

twoscreen.kv

+ScreenManager:
+    FirstScreen:
+        name: 'first'
+        id: first
+    SecondScreen:
+        id: second
+        name: 'second'
+        message: 'This is a message!'