Same here. It sounds like you even started when I did, ca. 2006. Starting from the blackberry era to my current pixel I've tried to do something similar with my cell phones, but I never usually program in that environment so I never got it off the ground. When LLMs got good a couple years ago getting a screenshot task up and running on my android was one of the first things I tried, but it's been a pain. Apparently Android has been putting in guards against that type of application for security/privacy reasons.