Hello. In general, I need to make registration in the application. Can you please tell me how to properly arrange it? In the Main Activity (MainActivity) I have to insert all the code associated with the authorization / registration itself (login / registration window), and then (with successful authorization) to trigger the activity responsible for the basis of the application (menu, some buttons, shorter than the main application screen)? And yes, could you advise any services, or even better lessons, in which it is well told in Russian? Unless, of course, does not complicate.
Thank you very much in advance.