Скачать или смотреть How to Properly Sign Out from Firebase Auth When Using Google Auth in Android

Learn the best practices for signing out from Firebase Authentication using Google Sign-In in Android. Get insights on why certain methods are sufficient and understand the intricacies involved.
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This video is based on the question https://stackoverflow.com/q/67407984/ asked by the user 'Mário Fernandes' ( https://stackoverflow.com/u/15646857/ ) and on the answer https://stackoverflow.com/a/67410516/ provided by the user 'DIGI Byte' ( https://stackoverflow.com/u/2301161/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Sign Out from Firebase Auth When Using Google Auth in Android

Signing out from your application is an essential part of maintaining user privacy and ensuring a secure experience. If you're using Firebase Auth alongside Google Auth in your Android app, you might find yourself wondering about the best approach to sign out your users correctly.

The Problem at Hand

When signing out, you want to ensure that not only is the user signed out from your application but also from Google services, if applicable. Your original implementation attempted to use the following code snippet:

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

This raises a key question: Do you really need to use mGoogleSignInClient.signOut() in addition to mFirebaseAuth.signOut()? Let's break it down.

The Solution

Understanding Firebase Auth Sign-Out

First, it’s important to recognize that Firebase Auth manages its own user object. Here are the weights of the paradigm:

FirebaseAuth.signOut() is essentially sufficient for signing out. When you invoke this method, the app resets the currentUser to null within the Firebase context.

This ensures that the user is no longer authenticated in connection with Firebase’s services. Therefore, using just this method may be adequate for most apps.

Why Consider Google Sign-Out?

You might be scratching your head, thinking: "So why does my app need to sign out using the GoogleSignInClient?"

Here are a few clarifications:

Automatic Sign-In: If your application utilizes an automatic sign-in feature from Google, then calling signOut() on both the Firebase and GoogleSignInClient is useful. This way, the session is cleared on both ends when the user signs out.

User Experience: Although it's not strictly necessary to call mGoogleSignInClient.signOut(), doing so can ensure a complete sign-out experience from Google, which might be beneficial for users who are concerned about privacy.

Best Practices

To summarize, here are your options when signing out:

Basic Sign-Out:

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

This is usually enough if there's no automatic signing feature enabled.

Full Sign-Out:

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

This safeguards the user's sign-in status across both Firebase and Google services, offering a more cautious approach.

Conclusion

In conclusion, if you are solely relying on FirebaseAuth.signOut(), it’s likely that your needs are covered. However, if you aim for a complete sign-out procedure, invoking mGoogleSignInClient.signOut() along with mFirebaseAuth.signOut() is the best practice. This offers a better user experience while ensuring robust security.

By clearly understanding how these sign-out functionalities relate, you empower your users with better control over their sign-in status across platforms.