Build a health app for uni project

For my project I need to crest a health app as the technical part. I’m supposed to be doing this myself so the code will need to have accompanying notes so I can understand what the code does for the questioning portion. The app should be created in Android Studio using Java coding.

The app should have a normal home page with log in function, then a menu option with things like set goals, food diary, step tracker, record workouts, weight tracker and chat function to be able to speak with expert