We will use the same code that we used in our previous recipe. Also, it is important to read it, if you want to know how to run your code on a real Android device.

Now, we have two files: the main.py file, the Python file with the operational part of the app, and the e1.kv file, the KV file with the graphical aspects of the app. If we want to improve our app design, we can run it like this:

$ python main.py -m screen:nexus7.2

Otherwise, if we want to see it as on a phone, we use:

$ python main.py -m screen:s3,portrait

We used the Kivy module screen that permits us to simulate the screen of the most common Android devices. If we run the app without the module, we will see an incorrect visualization of the app on the Android screen...