Yeah +1 on this is a little more than learning java.
If you haven't already, go through some basic java tutorials so you have a basic idea on how to create a simple program.
A calculator is a good start like you tried, i'd go back to that and post questions on this forum if/when you get stuck, then you can move onto some slightly more advanced topics.
I created my first app in 2012 with very little programming experience in a few months (now it would take me one day maybe), so it is possible just not easy at all.
And I have been doing it professionally ever since
If you have any Android related questions, feel free to PM me / create a new thread and PM me the link. I do not ask for anything in return
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