Hi, you can create UI on your android device exacley the same way as you would do it in java. Google how to create android layout. Learn layout types LinearLayout or RelativeLayout then add some Views to it like TextView, Button, ImageView or ProgressBar. You can check this out
https://developer.android.com/guide/topics/ui/declaring-layout. Scroll down a bit copy layout to your python project as multiline string like that:
mylayout="""<?xml version= ...
and """ on the end.
Then display this layout on screen using fullShow(mylayout). You can learn about building blocks and its attributes on same web if you like. Showing layout is one thing, but you need to recieve events from it like button clicks or progress bar movements. You have to use eventWait facade to know whats user did on screen and fullSetProperty to make some changes to your Views, TextView for example and on the end use fullDismiss to make your UI disapear