Why Does My Flutter App Hang After Pressing Sign In with Firebase?

Below are some troubleshooting steps and possible causes you can investigate:

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1. Wrap Async Calls in Try/Catch

It’s a good idea to use try/catch blocks (instead of mixing await and then) so you can capture any errors that may be causing the Future not to complete. For example:

DARTCopied
Future<void> signUp(email, password, firstName, lastName, city, country, bio, imageFileOfUser) async {
  try {
    Get.snackbar("Please wait", "We are creating an account for you");
    
    UserCredential result = await FirebaseAuth.instance
        .createUserWithEmailAndPassword(email: email, password: password);
    
    String currentUserId = result.user!.uid;
    // Update your model
    AppConstants.currentUser
      ..id = currentUserId
      ..firstName = firstName
      ..lastName = lastName
      ..city = city
      ..country = country
      ..bio = bio
      ..email = email
      ..password = password;
    
    // Save user info to Firestore
    await saveUserToFirestore(bio, city, country, email, firstName, lastName, currentUserId);
    
    // Optionally await the image upload if needed
    await addImageToFirebaseStorage(imageFileOfUser, currentUserId);
    
    Get.snackbar("Congratulations", "Your account has been created");
  } catch (e) {
    Get.snackbar("Oops", "Something went wrong: $e");
  }
}

This makes it easier to see if any error is thrown during the Firestore call (or later during the image upload).

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2. Verify Firestore Rules & Configuration

If the app hangs during the call to Firestore, it might be:

• Firestore rules: Ensure that the rules allow write access to the users collection for new users.
• Network or configuration issues: Make sure that there is no network issue or misconfiguration in your Firebase project.

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3. Check addImageToFirebaseStorage

If your addImageToFirebaseStorage is performing heavy or slow operations, or waiting on a never–ending Future, it can block the flow. Try isolating that function by commenting it out to see if the sign-up flow completes. If it does complete, review the upload/storage code for potential issues.

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4. Avoid Mixing await With then

Mixing both styles may lead to code that is hard to debug. Refactoring your code to use async/await throughout (as shown above) will help ensure that you have complete control over the flow and error handling.

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5. Log and Debug

• Logging: Add print statements or use a logging package to output debug information immediately before/after each asynchronous call.
• DevTools: Use Dart DevTools and check the logs to see if any error messages are provided when the app “gets stuck.”

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6. Test With a Smaller Data Payload

Sometimes if the data being saved (for example, if the image upload is involved) is too large or takes too long, it may appear that the await is blocking. Try testing with a placeholder image or no image to see if the sign-up completes.

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By following these steps, you should be able to narrow down whether there is a configuration issue (with Firebase Auth or Firestore rules), an error in a specific async function (like addImageToFirebaseStorage), or simply lack of error handling that leaves you without feedback. Make sure each asynchronous call is correctly awaited and any exceptions are caught so you can adjust accordingly.