How to catch a Firebase Auth specific exceptions

Question

Using Firebase, how do I catch a specific exception and tell the user gracefully about it? E.g :

FirebaseAuthInvalidCredentialsException: The email ad

Answer 1

I tried another solutions but didn't like them.

What about this:

if (!task.isSuccessful()) {

    Exception exc = task.getException();

    if (exc.getMessage().contains("The email address is badly formatted.")) {
        etUser.setError(getString(R.string.error_wrong_email));
        etUser.requestFocus();
    }
    else
    if (exc.getMessage().contains("There is no user record corresponding to this identifier. The user may have been deleted.")) {
        etUser.setError(getString(R.string.error_user_not_exist));
        etUser.requestFocus();
    }
    else
    if (exc.getMessage().contains("The password is invalid or the user does not have a password")) {
        etPass.setError(getString(R.string.error_wrong_password));
        etPass.requestFocus();
    }


    Log.w(TAG, "signInWithEmail:failed", task.getException());


    Toast.makeText(AuthActivity.this, R.string.auth_failed,
            Toast.LENGTH_SHORT).show();
}

Answer 2

    try {
            throw task.getException();
        } catch(FirebaseAuthException e) {
           switch (e.getErrorCode()){
                        case "ERROR_WEAK_PASSWORD":
                      Toast.makeText(this, "The given password is invalid.", Toast.LENGTH_SHORT).show();
                             break;
                      //and other
                    }
        }

error codes: https://stackoverflow.com/a/38244409/2425851

Answer 3

If you are sending upstream messages from user to cloud, implement firebase callback functions onMessageSent and onSendError to check the status of upstream messages. In error cases, onSendError returns a SendException with an error code.

For example, if the client attempts to send more messages after the 20-message limit is reached, it returns SendException#ERROR_TOO_MANY_MESSAGES.

Answer 4

If you simply want display a message to the user this works. Simple and Elegant:

if (!task.isSuccessful()) {
    Log.w(TAG, "signInWithEmail:failed", task.getException());
    Toast.makeText(LoginActivity.this, "User Authentication Failed: " + task.getException().getMessage(), Toast.LENGTH_SHORT).show();
}

It appears that the .getMessage() method converts the exception to a usable format for us already and all we have to do is display that somewhere to the user.

(This is my first comment, constructive criticism please)

Answer 5

To catch a firebase Exception is easy, you should add .addOnFailureListener after you add .addOnCompleteListener like this:

 private void login_user(String email, String password) {

    mAuth.signInWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
           if(task.isSuccessful()){
               Intent intent = new Intent(getApplicationContext(),MainActivity.class);
               startActivity(intent);
               finish();
           }if(!task.isSuccessful()){


                // To know The Excepton 
                //Toast.makeText(LoginActivity.this, ""+task.getException(), Toast.LENGTH_LONG).show();

           }
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            if( e instanceof FirebaseAuthInvalidUserException){
                Toast.makeText(LoginActivity.this, "This User Not Found , Create A New Account", Toast.LENGTH_SHORT).show();
            }
            if( e instanceof FirebaseAuthInvalidCredentialsException){
                Toast.makeText(LoginActivity.this, "The Password Is Invalid, Please Try Valid Password", Toast.LENGTH_SHORT).show();
            }
            if(e instanceof FirebaseNetworkException){
                Toast.makeText(LoginActivity.this, "Please Check Your Connection", Toast.LENGTH_SHORT).show();
            }
        }
    });

Answer 6

you can use this:

mAuth.getCurrentUser().linkWithCredential(authCredential)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "linkWithCredential:success");
                    } else {
                        Log.w(TAG, "linkWithCredential:failure", task.getException());
                        Toast.makeText(getApplicationContext(), "Authentication failed. " + task.getException().toString, Toast.LENGTH_SHORT).show();

                    }

                    // ...
                }
            });