Скачать или смотреть Resolving the Issue of Different UIDs in Firebase Authentication and Realtime Database

Discover how to tackle the difference in UIDs between Firebase Authentication and Realtime Database when using phone number verification in your Android app.
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Resolving the Issue of Different UIDs in Firebase Authentication and Realtime Database

When developing an application using Firebase, one common challenge developers encounter is the discrepancy in User IDs (UIDs) between Firebase Authentication and the Firebase Realtime Database.

Understanding the Problem

In the case of Android apps that utilize phone number verification, problems can arise if the UIDs generated by Firebase Authentication (upon user login) do not match those stored in the Realtime Database. For instance, while developing a login system with phone number and OTP verification, you might discover a scenario like so:

A user successfully logs in using their phone number, but they notice that their UID in the Realtime Database is different from the one shown in Firebase Authentication.

Example:

UID in Firebase Authentication: R3ZjGJl56vcmwRKLBiUpB0g2xDc2

UID in Firebase Realtime Database: EbC9e1K39MYNJ49M7QrvV8ZLshJ3

This difference can lead to confusion and unexpected behavior when trying to manage user information in your app.

Why Are UIDs Different?

The difference in UIDs often stems from how user accounts are created and referenced. When registering users or performing user-specific operations, it is essential to ensure that you consistently use the same UID across both Firebase Authentication and the Realtime Database.

Solution: Streamlined User Registration

Instead of instantly adding users to the Realtime Database when they verify their account, a better approach is to delay the database entry until after their account creation is confirmed in the Authentication process. Below is a streamlined method to achieve this.

Step-by-Step Guide to Implement the Solution

Login and Account Verification:
Ensure your application signs the user in using their phone number and OTP.

After a successful login, instead of immediately saving the user's data, proceed to the next activity.

Pass User Data to the Next Activity:
Pass the phone number and username to the next activity (e.g., HobbiesActivity) where you'll store the user details in your database.

[[See Video to Reveal this Text or Code Snippet]]

Store User in Firebase Realtime Database:
In the HobbiesActivity, retrieve the passed-in user information and save it under the correct UID.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By implementing this strategy, you ensure that the user is created with a consistent UID across both Firebase Authentication and the Realtime Database. This not only prevents confusion for the user but also maintains the integrity of your application's user management system.

Feel free to adapt these practices as per your application's requirements to provide a seamless experience for your users. Happy coding!