private void saveCredentialClicked()

in CredentialsQuickstart/app/src/main/java/com/google/example/credentialsbasic/MainActivity.java [153:197]
30 lines of code
3 McCabe index (conditional complexity)

    private void saveCredentialClicked() {
        String email = mEmailField.getText().toString();
        String password = mPasswordField.getText().toString();

        // Create a Credential with the user's email as the ID and storing the password.  We
        // could also add 'Name' and 'ProfilePictureURL' but that is outside the scope of this
        // minimal sample.
        Log.d(TAG, "Saving Credential:" + email + ":" + anonymizePassword(password));
        final Credential credential = new Credential.Builder(email)
                .setPassword(password)
                .build();

        showProgress();

        // NOTE: this method unconditionally saves the Credential built, even if all the fields
        // are blank or it is invalid in some other way.  In a real application you should contact
        // your app's back end and determine that the credential is valid before saving it to the
        // Credentials backend.
        showProgress();

        mCredentialsClient.save(credential).addOnCompleteListener(
                new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        if (task.isSuccessful()) {
                            showToast("Credential saved.");
                            hideProgress();
                            return;
                        }

                        Exception e = task.getException();
                        if (e instanceof ResolvableApiException) {
                            // The first time a credential is saved, the user is shown UI
                            // to confirm the action. This requires resolution.
                            ResolvableApiException rae = (ResolvableApiException) e;
                            resolveResult(rae, RC_SAVE);
                        } else {
                            // Save failure cannot be resolved.
                            Log.w(TAG, "Save failed.", e);
                            showToast("Credential Save Failed");
                            hideProgress();
                        }
                    }
                });
    }