Question 200867 in Flutter Question posted in
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Flutter: how to access variable in initState() and Constructor outside?

I want integrate Flutter with an ASP.NET API. the problem is when I create variable url to call parameter to put in _newbloc, i cannot initialize url to widget.id without put in initstate and i cannot put _newbloc in constructor because it cannot be access in initstate. this is my code

class DetailsScreen extends StatefulWidget{
   static final theKey = GlobalKey<_DetailsScreen>();
   final  Rows model;
   
   DetailsScreen({ Key? key, required this.model }) : super(key: theKey);

  @override
  _DetailsScreen createState() => _DetailsScreen();
}

class _DetailsScreen extends State<DetailsScreen>{
  _DetailsScreen(){
    final detailBloc _newsBloc = detailBloc(utl: url); // cannot be access outside
  }
  final detailBloc _newsBloc = detailBloc(utl: url);
  

  @override
  void initState() {
    _newsBloc.add(GetDetailList());
    String? url = widget.model.id; //cannot be access outside
    
    super.initState();
  }

how to solve this?

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2

Answers


  1. 0

    You can add a late keyword to _newsBloc, then you can initialize it in initState()

    class _DetailsScreen extends State<DetailsScreen>{

  late final detailBloc _newsBloc;
  
  @override
  void initState() {
    String? url = widget.model.id; //cannot be access outside
    _newsBloc = detailBloc(utl: url);
    _newsBloc.add(GetDetailList());
    
    super.initState();
  }
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  2. 0 
    class DetailsScreen extends StatefulWidget{
   static final theKey = GlobalKey<_DetailsScreen>();
   final  Rows model;

   DetailsScreen({ Key? key, required this.model }) : super(key: theKey);

   @override
   _DetailsScreen createState() => _DetailsScreen();
}

class _DetailsScreen extends State<DetailsScreen> {

   late detailBloc _newsBloc;

   @override
   void initState() {
      _newsBloc = detailBloc(utl: widget.model.id);
      _newsBloc.add(GetDetailList());
      super.initState(); 
   }
   /// Remaining code
}

    Initialize the bloc in the initState, and add the late keyword to _newsBloc property. You dont really need the url variable.

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