Check if user exist in firebase

MIT App Inventor Help
1

hello everyone
can i know how to check when i make registration user - if a user exist in firebase or no and prevent to overwrite!!! the user is 500
2023-11-19_13-39-12

2

Call tag Users, when got data if username exists in list show notification if not add data to firebase

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3

Can you put sample

4

Something like this:

image

It looks like you need to do some learning and research about using AppInventor and Firebase:

for AppInventor:

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 http://appinventor.mit.edu.ezproxy.canberra.edu.au/explore/ai2/tutorials.html 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 icon24 Taifun.

and for Firebase:

also

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