Create ScreenChanger,py

Kivy/ScreenChanger.py

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+# coding: utf-8
+
+import kivy
+from kivy.app import App
+from kivy.uix.boxlayout import BoxLayout
+from kivy.uix.button import Button
+
+# version requirement
+kivy.require('1.9.1')
+
+
+class Tela1(BoxLayout):
+    def __init__(self, **kwargs):
+        super(Tela1, self).__init__(**kwargs)
+        self.orientation = 'vertical'
+        bt1 = Button(text='Click')
+        bt1.on_press = self.on_press_bt
+        self.add_widget(bt1)
+        self.add_widget(Button(text='bt2'))
+        self.add_widget(Button(text='bt3'))
+
+    def on_press_bt(self):
+        janela.root_window.remove_widget(janela.root)
+        janela.root_window.add_widget(Tela2())
+
+
+class Tela2(BoxLayout):
+    def __init__(self, **kwargs):
+        super(Tela2, self).__init__(**kwargs)
+        self.orientation = 'vertical'
+        bt = Button(text='Click')
+        bt.on_press = self.on_press_bt
+        self.add_widget(bt)
+
+    def on_press_bt(self):
+        janela.root_window.remove_widget(janela.root)
+        janela.root_window.add_widget(Tela1())
+
+
+class Main(App):
+    def build(self):
+        return Tela1()
+
+
+janela = Main()
+janela.run()