Well, there is a couple of ways to go about it. One, you could learn a native language that runs on android, which I believe are Dart, Flutter, and Java. Or Two, you could use a wrapper type thing: Such as https://www.electronjs.org/ if you wanted to do it in javascript, or something like https://beeware.org/project/briefcase/ if you wanted to try one that works with python. I'm sure there are others as well, those are just the two that jumped to my mind.