HelloWorld toga/beeware app on Android

app.py

"""
My first application
"""
import toga
from toga.constants import RIGHT
from toga.style import Pack
from toga.style.pack import COLUMN, ROW



class HelloWorld(toga.App):

    def startup(self):
        main_box = toga.Box(style=Pack(direction=COLUMN))

        name_label = toga.Label(
            'Your name: ',
            style=Pack(padding=(0, 5))
        )
        self.name_input = toga.TextInput(style=Pack(flex=1))

        main_box.add(name_label)
        main_box.add(self.name_input)

        button = toga.Button(
            'Say Hello!',
            on_press=self.say_hello,
            style=Pack(flex=1)
        )
        print("HELLO BUTTON DO NOT GO AWAY", button)

        main_box.add(button)
        print("main_box added the button, so where did it go")

        self.main_window = toga.MainWindow(title=self.formal_name)
        self.main_window.content = main_box
        self.main_window.show()

    def say_hello(self, widget):
        print("Hello", self.name_input.value)
        print("Hello say_hello")

def main():
    return HelloWorld()