more example code

main.kv

@@ -1,10 +1,137 @@
 #: import sm kivy.uix.screenmanager
+#: import CheckBox kivy.uix.checkbox
+
+<CustLabel@Label>
+    color: 1, 1, 1, 1
+
+<CustomPopup>:
+    size_hint: .5, .5
+    auto_dismiss: False
+    title: "The Popup"
+    Button:
+        text: "Close"
+        on_press: root.dismiss()
+
+SampleBoxLayout:
+
+<SampleBoxLayout>:
+    orientation: "vertical"
+    padding: 10
+    spacing: 10
+
+    BoxLayout:
+        orientation: "horizontal"
+        size_hint_x: .22
+        CustLabel:
+            text: "Are you over 18"
+            size_hint_x: .80
+        CheckBox:
+            on_active: root.checkbox_18_clicked(self, self.active)
+            size_hint_x: .55
+
+    BoxLayout:
+        orientation: "horizontal"
+        size_hint_x: .55
+        CustLabel:
+            text: "Favorite Color"
+            size_hint_x: .265
+        CheckBox:
+            group: "fav_color"
+            value: root.blue
+            size_hint_x: .05
+        CustLabel:
+            text: "Blue"
+            size_hint_x: .15
+        CheckBox:
+            group: "fav_color"
+            value: root.red
+            size_hint_x: .05
+        CustLabel:
+            text: "Red"
+            size_hint_x: .15
+        CheckBox:
+            group: "fav_color"
+            value: root.green
+            size_hint_x: .05
+        CustLabel:
+            text: "Green"
+            size_hint_x: .15
+
+    BoxLayout:
+        orientation: "horizontal"
+        height: 30
+
+        BoxLayout:
+            orientation: "horizontal"
+            size_hint_x: .25
+            CustLabel:
+                text: str(slider_id.value)
+            Slider:
+                id: slider_id
+                min: -100
+                max: 100
+                value: 0
+                step: 1
+
+        BoxLayout:
+            orientation: "horizontal"
+            size_hint_x: .25
+            CustLabel:
+                text: "On / Off"
+            Switch:
+                id: switch_id
+                on_active: root.switch_on(self, self.active)
+
+    BoxLayout:
+        orientation: "horizontal"
+        height: 30
+
+        BoxLayout:
+            orientation: "horizontal"
+            size_hint_x: .25
+            Button:
+                text: "Open Popup"
+                on_press: root.open_popup()
+
+        BoxLayout:
+            orientation: "horizontal"
+            size_hint_x: .25
+            Spinner:
+                text: "First"
+                values: ["First", "Second", "Third"]
+                id: spinner_id
+                on_text: root.spinner_clicked(spinner_id.text)
+
+    BoxLayout:
+        orientation: "horizontal"
+        size_hint_x: 30
+
+        BoxLayout:
+            orientation: "horizontal"
+            size_hint_x: .25
+            TabbedPanel:
+                do_default_tab: False
+                TabbedPanelItem:
+                    text: "1st Tab"
+                    Label:
+                        text: "Content of First Panel"
+                        color: 1, 1, 1, 1
+                TabbedPanelItem:
+                    text: "2nd Tab"
+                    Label:
+                        text: "Content of Second Panel"
+                        color: 1, 1, 1, 1
+                TabbedPanelItem:
+                    text: "3rd Tab"
+                    Label:
+                        text: "Content of Third Panel"
+                        color: 1, 1, 1, 1
+        
 <ScreenManagement>:
     transition: sm.FadeTransition()
     MainScreen:
     AboutScreen:
 
 <MainScreen>:
-    
 
 <AboutScreen>:

main.py

@@ -2,15 +2,49 @@ from random import randrange
 
 from kivy.app import App
 from kivy.clock import Clock
+from kivy.lang import Builder
 
-from kivy.core.window import Window
+from kivy.uix.screenmanager import Screen, ScreenManager
-
+from kivy.uix.boxlayout import BoxLayout
-
 from kivy.uix.label import Label
+from kivy.uix.popup import Popup
 from kivy.uix.widget import Widget
 
+from kivy.properties import ObjectProperty
+from kivy.core.window import Window
+
 from kivy.graphics import Rectangle
 
+Builder.load_string("""
+<ScreenOne>:
+    BoxLayout:
+        Button:
+            text: "Go to Screen 2"
+            on_press:
+                root.manager.transition.direction = "left"
+                root.manager.transition.duration = 1
+                root.manager.current = "screen_two"
+                
+<ScreenTwo>:
+    BoxLayout:
+        Button:
+            text: "Go to Screen 1"
+            on_press:
+                root.manager.transition.direction = "right"
+                root.manager.transition.duration = 1
+                root.manager.current = "screen_one"
+""")
+
+class ScreenOne(Screen):
+    pass
+
+class ScreenTwo(Screen):
+    pass
+
+screen_manager = ScreenManager()
+screen_manager.add_widget(ScreenOne(name="screen_one"))
+screen_manager.add_widget(ScreenTwo(name="screen_two"))
+
 def collides(rect1, rect2):
     r1x = rect1[0][0]
     r1y = rect1[0][1]
@@ -85,6 +119,47 @@ class GlobalForest(App):
         #return Label(text='Hello world')
         return GameWidget()
 
+class CustomPopup(Popup):
+    pass
+
+class SampleBoxLayout(BoxLayout):
+    checkbox_is_active = ObjectProperty(False)
+    def checkbox_18_clicked(self, instance, value):
+        if value is True:
+            print("Checkbox Checked")
+        else:
+            print("Checkbox is Unchecked")
+
+    blue = ObjectProperty(True)
+    red = ObjectProperty(False)
+    green = ObjectProperty(False)
+    
+    def switch_on(self, instance, value):
+        if value is True:
+            print("Switch On")
+        else:
+            print("Switch Off")
+        
+    def open_popup(self):
+        the_popup = CustomPopup()
+        the_popup.open()
+        
+    def spinner_clicked(self, value):
+        print("Spinner Value " + value)
+
+class MainApp(App):
+    def build(self):
+        #Window.clearcolor = (1, 1, 1, 1)
+        return screen_manager
+    
+        global app, screens
+        app = self
+        screens = {'main_screen': MainScreen(name='main_screen'),
+                   'about_screen': AboutScreen(name='about_screen')}
+        self.screen_manager = ScreenManager
+        self.main()
+
 if __name__ == '__main__':
-    app = GlobalForest()
+    #app = GlobalForest()
+    app = MainApp()
     app.run()