If admin log in successfull mean, use tinyDB to store it as with some key like, tag(admin login) Value (success).
Whenevr screen login make your app to get tinyDB get tag(admin login) if no value enable login BUtton for admin, if it is not empty redirects the app to open screen name linked with after admin login
So when the splash screen over Show in a VA which contain User login and Admin login Button.
If the user hits, User login make user login VA to display. If login successful store the data in tineDB as tag(user login) value (success) and if the user hits admin login make Admin VA log in page, if the login success do the same process by changing the tag
In this page only i said..
When screen 2 initialize, call tindy DB to check both values.