Do I need an initial authorization form for an android application?

Question

Android

Good afternoon/evening/night.
I'm making an application for android, stuck on a question with an authorization form. More precisely, there is more of a question on the interface and design. Do I need a login/authorization form in the application first?
Or start from the main menu, and then, if the user needs to use the application's functions, then log in?
P.s. this is my first application, I xs, read about the standards, there is ambiguous.
Below is an example (do not look at the design, do not throw slippers, this is not a release design, but a crooked prototype)
Login form

Or right here (let's say)

Answer 1

Usually, authorization is done through the android account in a transparent mode. Those. the user launched the application - it authorized him automatically. The application "climbed" to your server - a Google ID is transmitted.
If the application needs to work with a server under an arbitrary account of this service or it needs increased security at startup, then an ADDITIONAL login form is created, otherwise, an authorization and login form is not needed in principle.
See here how to make an authorization.