RestofitAndRealm.Java

//Create all Retrofit stuff..
RestAdapter restAdapter = new RestAdapter.Builder()
    .setEndpoint("https://api.myserver.com")
    .build();
MyService service = restAdapter.create(MyService.class);

//Fetch the user from the api
User user = service.getUser("432947");

//Save it to realm
Realm realm = Realm.getInstance(context;
realm.beginTransaction();
realm.copyToRealm(user);
realm.commitTransaction();