android - How would one design a flow where one of the screens is a login screen?

Question

I am writing an Android app which requires the user to be logged in. I have a main Activity, and I want that when the app launches, that it takes the user to a login screen if they are not already logged in.

How should I model this? Is the login page another Activity? I'm thinking not because I don't want the user to be able to get back there using the back button. Or is there a way to replace an activity with another so the back button problem doesn't happen?

Or, should I have just one activity and load in a login view and swap it out once the user logs in?

Are there any best practices around this?

Thanks!

Answer 1

I would check on the main or splash screen to check if the user is logged in, if not start the login activity.

Once the login completes, in the login activity, call this.finish()

If you need to change activities, you can call .finish() followed by starting whatever activity you wanted.

If getting back to the splash/main screen without being logged in is a problem, you can do the same thing there.