private void updateUI()

in auth/app/src/main/java/com/google/firebase/quickstart/auth/java/PhoneAuthFragment.java [273:336]
49 lines of code
10 McCabe index (conditional complexity)

    private void updateUI(int uiState, FirebaseUser user, PhoneAuthCredential cred) {
        switch (uiState) {
            case STATE_INITIALIZED:
                // Initialized state, show only the phone number field and start button
                enableViews(mBinding.buttonStartVerification, mBinding.fieldPhoneNumber);
                disableViews(mBinding.buttonVerifyPhone, mBinding.buttonResend, mBinding.fieldVerificationCode);
                mBinding.detail.setText(null);
                break;
            case STATE_CODE_SENT:
                // Code sent state, show the verification field, the
                enableViews(mBinding.buttonVerifyPhone, mBinding.buttonResend, mBinding.fieldPhoneNumber, mBinding.fieldVerificationCode);
                disableViews(mBinding.buttonStartVerification);
                mBinding.detail.setText(R.string.status_code_sent);
                break;
            case STATE_VERIFY_FAILED:
                // Verification has failed, show all options
                enableViews(mBinding.buttonStartVerification, mBinding.buttonVerifyPhone, mBinding.buttonResend, mBinding.fieldPhoneNumber,
                        mBinding.fieldVerificationCode);
                mBinding.detail.setText(R.string.status_verification_failed);
                break;
            case STATE_VERIFY_SUCCESS:
                // Verification has succeeded, proceed to firebase sign in
                disableViews(mBinding.buttonStartVerification, mBinding.buttonVerifyPhone, mBinding.buttonResend, mBinding.fieldPhoneNumber,
                        mBinding.fieldVerificationCode);
                mBinding.detail.setText(R.string.status_verification_succeeded);

                // Set the verification text based on the credential
                if (cred != null) {
                    if (cred.getSmsCode() != null) {
                        mBinding.fieldVerificationCode.setText(cred.getSmsCode());
                    } else {
                        mBinding.fieldVerificationCode.setText(R.string.instant_validation);
                    }
                }

                break;
            case STATE_SIGNIN_FAILED:
                // No-op, handled by sign-in check
                mBinding.detail.setText(R.string.status_sign_in_failed);
                break;
            case STATE_SIGNIN_SUCCESS:
                // Np-op, handled by sign-in check
                break;
        }

        if (user == null) {
            // Signed out
            mBinding.phoneAuthFields.setVisibility(View.VISIBLE);
            mBinding.signOutButton.setVisibility(View.GONE);

            mBinding.status.setText(R.string.signed_out);
        } else {
            // Signed in
            mBinding.phoneAuthFields.setVisibility(View.GONE);
            mBinding.signOutButton.setVisibility(View.VISIBLE);

            enableViews(mBinding.fieldPhoneNumber, mBinding.fieldVerificationCode);
            mBinding.fieldPhoneNumber.setText(null);
            mBinding.fieldVerificationCode.setText(null);

            mBinding.status.setText(R.string.signed_in);
            mBinding.detail.setText(getString(R.string.firebase_status_fmt, user.getUid()));
        }
    }