finished app version 1.00

main.py

 from kivy.app import App
 from kivy.modules import inspector # For inspection.
+from kivy.properties import BooleanProperty, ListProperty, NumericProperty, StringProperty
 from kivy.core.window import Window # For inspection.
+from kivy.uix.behaviors import ToggleButtonBehavior
+from kivy.uix.screenmanager import ScreenManager, Screen
 
 __app_package__ = 'edu.unl.cse.soft161.order'
 __app__ = 'Order Meal'
 __version__ = '0.1'
 __flags__ = ['--bootstrap=sdl2', '--requirements=python2,kivy', '--orientation=landscape']
 
-
 class OrderApp(App):
+
+    pepperoni = BooleanProperty(False)
+    sausage = BooleanProperty(False)
+    hamburger = BooleanProperty(False)
+    bacon = BooleanProperty(False)
+    onions = BooleanProperty(False)
+    black_olives = BooleanProperty(False)
+    mushrooms = BooleanProperty(False)
+    green_peppers = BooleanProperty(False)
+    printStatement = StringProperty("")
+
+    def pepperoniSwitch(self):
+        self.pepperoni = not self.pepperoni
+
+    def sausageSwitch(self):
+        self.sausage = not self.sausage
+
+    def hamburgerSwitch(self):
+        self.hamburger = not self.hamburger
+
+    def baconSwitch(self):
+        self.bacon = not self.bacon
+
+    def onionSwitch(self):
+        self.onions = not self.onions
+
+    def oliveSwitch(self):
+        self.black_olives = not self.black_olives
+
+    def mushroomSwitch(self):
+        self.mushrooms = not self.mushrooms
+
+    def pepperSwitch(self):
+        self.green_peppers = not self.green_peppers
+
     def build(self):
+
         inspector.create_inspector(Window, self) # For inspection (press control-e to toggle).
 
+    def clickPepperonis(self):
+        if self.pepperoni == False : self.pepperoni = True
+        else : self.pepperoni = True
+
+    def printOrder(self):
+        pepperoni=""
+        sausage=""
+        hamburger=""
+        bacon=""
+        onions=""
+        olives=""
+        mushrooms=""
+        peppers=""
+
+        if self.pepperoni == True : pepperoni = " pepperoni"
+        if self.sausage == True : sausage = " sausage"
+        if self.hamburger == True : hamburger = " hamburger"
+        if self.bacon == True : bacon = " bacon"
+        if self.onions == True : onions = " onion"
+        if self.black_olives == True : olives = " olive"
+        if self.mushrooms == True : mushrooms = " mushroom"
+        if self.green_peppers == True : peppers = " green pepper"
+
+
+        self.printStatement = "Your order for a"+pepperoni+sausage+hamburger+bacon+onions+olives+mushrooms+peppers+" cheese pizza has been processed."
 
 if __name__ == '__main__':
     app = OrderApp()

order.kv

 BoxLayout:
     orientation: 'vertical'
+    BoxLayout:
+        orientation: 'vertical'
+        Label:
+            font_size: '85sp'
+            text: 'Pizza Place'
+        BoxLayout:
+            orientation: 'horizontal'
+            Label:
+                font_size: '30sp'
+                color: [100, 0, 0, 1]
+                text: 'Meats'
+            ToggleButton:
+                text: 'Pepperoni'
+                on_press: app.pepperoniSwitch()
+            ToggleButton:
+                text: 'Sausage'
+                on_press: app.sausageSwitch()
+            ToggleButton:
+                text: 'Hamburger'
+                on_press: app.hamburgerSwitch()
+            ToggleButton:
+                text: 'Bacon'
+                on_press: app.baconSwitch()
+        BoxLayout:
+            orientation: 'horizontal'
+            Label:
+                font_size: '25sp'
+                color: [0, 100, 0, 1]
+                text: 'Vegetables'
+            ToggleButton:
+                text: 'Onions'
+                on_press: app.onionSwitch()
+            ToggleButton:
+                text: 'Black olives'
+                on_press: app.oliveSwitch()
+            ToggleButton:
+                text: 'Mushrooms'
+                on_press: app.mushroomSwitch()
+            ToggleButton:
+                text: 'Green peppers'
+                on_press: app.pepperSwitch()
+        BoxLayout:
+            orientation: 'horizontal'
+            Button:
+                bold: True
+                font_size: '40sp'
+                on_press: app.printOrder()
+                text: 'Submit order'
+        BoxLayout:
+            orientation: 'horizontal'
             Label:
-        text: '[Your meal-ordering GUI here]'
+                font_size: '14sp'
+                color: [0, 100, 0, 1]
+                text: str(app.printStatement)