Using Android App without providing username and password

I am a developer of xlsform and support more than 100+ users. I prefer the Android app over the link because of the remote areas data is being collected. My problem is users have figured out that the the login details in the app is the same as the one to access the backend.
Is there a workaround in which the users can still use the app but not with the details.
I did not check if it has already been discussed so you can point me

Welcome to the community, @amurt_tujitegemee! This post discussed previously should help you solve your issue: