I want APIs to android apps, I use material notes app as a personal twitter and to track my excercise, I want to schedule a backup of the app, which surprisingl

I want APIs to android apps, I use material notes app as a personal twitter and to track my excercise, I want to schedule a backup of the app, which surprisingly gives you the internal sqlite database, I'd then sync it to my machine using syncthing and then perform analytics on it. I want to eventually be able to sync up everything & make my phone into my personal assistant like it'd suggest me to call up someone I hadn't called in a long time, remember birthdays, and it'd be voice enabled which'd work offline.