Hi! I am making an app and want to create a loading screen that sees if the user if a returning user or new user to app. For example, if they have opened the app before they get to the general home screen. If they have never opened the app (just downloaded) a starter tutorial pops up. Any help if appreciated thanks I am a beginner!
Use TinyDB
A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .
Also do the tutorials Our Tutorials! to learn the basics of App Inventor, then try something and follow the Top 5 Tips: How to learn App Inventor
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
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It's simple, when app open call firebase get value tag = unique android id (if you want extension for unique android id which works for all android devices then DM me), if android id is in firebase then don't show tutorial popup else call firebase store value tag android id show tutorial popup.