Run bloc only when list is empty - flutter

Question

Why my function in initState - the loop doesnt work?
I mean that I just wanna run function
_newsBloc.add(GetCompanyList());
Only in first time app run when list of users is empty.
I just wanna make it because when I'm changing activities to other I have to wait again to fetch data from my api, but i dont want it.
If it ask Api 1 time I do not need it anymore.
Then I'm checkig length of list in init state it always return 0.
Any ideas?
This is my code:
class _CompanyActivityState extends State<CompanyActivity> with SingleTickerProviderStateMixin {
List<Company> _users = [];
final CompanyBloc _newsBloc = CompanyBloc();
#override
void initState() {
super.initState();
if(_users.length < 0 ) {
_newsBloc.add(GetCompanyList());
}
}
#override
Widget build(BuildContext context) {
return Scaffold(
drawer: NavigationDrawerWidget(),
appBar: buildAppBar(),
floatingActionButton: Stack(
children: <Widget>[
Stack(
body: createListViewWidgets());
}
Widget createListViewWidgets() {
return Container(
margin: EdgeInsets.all(8.0),
child: BlocProvider(
create: (_) => _newsBloc,
child: BlocListener<CompanyBloc, CompanyState>(
listener: (context, state) {
if (state is CompanyError) {
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text(state.message),
));
}
},
child: BlocBuilder<CompanyBloc, CompanyState>(
builder: (context, state) {
if (state is CompanyInitial) {
return _buildLoading();
} else if (state is CompanyLoading) {
return _buildLoading();
} else if (state is CompanyLoaded) {
_users = state.company;
return _listViewCard(context, state.company);
} else if (state is CompanyError) {
return Container();
} else {
return Container();
}
},
),
),
),
);
}
}
Bloc which works;
class CompanyBloc extends Bloc<CompanyEvent, CompanyState> {
List<Company> mList = [];
final ApiRepository _apiRepository = ApiRepository();
CompanyBloc() : super(CompanyInitial()) {
on<GetCompanyList>((event, emit) async {
try {
emit(CompanyLoading());
mList.addAll(await _apiRepository.fetchCompanyList());
emit(CompanyLoaded(mList));
if (mList.length == 0) {
emit(CompanyError('List is empty'));
}
} on NetworkError {
emit(CompanyError("Failed to fetch data. is your device online?"));
}
});
}
}
And state which is used to create _users list:
class CompanyLoaded extends CompanyState {
final List<Company> company;
const CompanyLoaded(this.company);
#override
List<Object> get props => throw UnimplementedError();
}