Connect to multiple accounts

Question

I am planning to make a locator app in android java language. What I want to know is, how can I connect multiple accounts to the main/admin account so that I can track them? I want to have the options of adding the other accounts through sending digit codes to the email address and phone number.

I want to know what specific classes, libraries or any other ways needed for that.

Thank you....

Answer 1

If you're using Firebase's Firestore then simply add the user's Uid to admins document in a String array considering that you have a structure like Users (collection) > Uid (document).

Similarly, every user should have a unique code that can be sent from admin to the user that has to be added and a mechanism to prevent unknown users from getting added to admins location array.