How to catch Android Firebase signUpWithEmailAndPassword error code?

Question

I see online in JavaScript documentation you can catch the error code returned from the createUserWithEmailAndPassword function to determine whether it's a email already used, password too weak etc. How do I do this in Java?

This in JavaScript can tell which error it is.

firebase.auth().signInWithEmailAndPassword(email, password).catch(function(error) {
  // Handle Errors here.
  var errorCode = error.code;
  var errorMessage = error.message;
  // ...
});

Answer 1

see this code for your reference this might be the exact answer yo want, catch exception if task not successful as shown in below code,

             mAuth.createUserWithEmailAndPassword(mUserEmail, mPassword)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {

                    Log.d(LOG_TAG, getString(R.string.log_message_auth_successful) + " createUserWithEmail:onComplete:" + task.isSuccessful());

                    // if task is not successful show error
                    if (!task.isSuccessful()) {
                        mAuthProgressDialog.dismiss();

                        try {
                            throw task.getException();
                        } catch (FirebaseAuthUserCollisionException e) {
                              // show error toast ot user ,user already exist

                            } catch (FirebaseNetworkException e) {
                            //show error tost network exception

                        } catch (Exception e) {
                            Log.e(LOG_TAG, e.getMessage());
                        }
                        Toast.makeText(CreateAccountActivity.this, R.string.log_error_occurred,
                                Toast.LENGTH_LONG).show();
                    } else {

                        // successfully account created
                        // now the AuthStateListener runs the onAuthStateChanged callback


                    }
                }

            });

Answer 2

I think task.getException() is the counterpart in Android for the errorCode you're looking for. The example in the docs shows it:

Sign up new users

Create a new createAccount method which takes in an email address and password, validates them and then creates a new user with the createUserWithEmailAndPassword method.

mAuth.createUserWithEmailAndPassword(email, password)
    .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            Log.d(TAG, "createUserWithEmail:onComplete:" + task.isSuccessful());

            // If sign in fails, display a message to the user. If sign in succeeds
            // the auth state listener will be notified and logic to handle the
            // signed in user can be handled in the listener.
            if (!task.isSuccessful()) {
                Toast.makeText(EmailPasswordActivity.this, R.string.auth_failed,
                        Toast.LENGTH_SHORT).show();
            }

            // ...
        }
    });

Add a form to register new users with their email and password and call this new method when it is submitted. You can see an example in our quickstart sample.