Ressources Plateformes de développement mobile

We can only make apps for android mobiles, tablets, tv, and smartwatches, .but i want to make the app for iso and other operating systems using android studio, which is not possible with the current android studio version. can we have the cross-platform development feature in the future

when I launch this software in the debug phase, this software is very slow and causes my pc to slow down

I want to give relation key between two tables like foreign key but i couldn't. Please help me with that.