} else { // The device in in single-paned mode
// Hide `add_domain_fab`.
FloatingActionButton addDomainFAB = (FloatingActionButton) getActivity().findViewById(R.id.add_domain_fab);
} else { // The device in in single-paned mode
// Hide `add_domain_fab`.
FloatingActionButton addDomainFAB = (FloatingActionButton) getActivity().findViewById(R.id.add_domain_fab);