class BuilderLoading extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    TenderApiProvider apiProv = Provider.of<TenderApiProvider>(context);
    // apiProv.getToken();
    return StreamBuilder<ApiKeyLoadingState>(
        stream: apiProv.streamApiKeyController.stream, // here
        builder: (BuildContext context, AsyncSnapshot<ApiKeyLoadingState> snapshot)
        {
          switch (apiProv.apiKeyLoadingState) {
            case ApiKeyLoadingState.Progress:
                return Text("Retreiving key");
            case ApiKeyLoadingState.Done:
                return HomePage();
            case ApiKeyLoadingState.Error:
                return Text("Key Got Error");
              break;
            default:
              return Text("Unknown");
          }

        }

    );

  }
}

return (
builder: (BuildContext context, AsyncSnapshot<ApiKeyLoadingState> snapshot)
{
   // ... streamApiKeyController

}

builder: (BuildContext context, AsyncSnapshot<regionsLoadingState> snapshot)
{
   // ... streamRegionsLoadingController
}
);