I am trying to create a listview with API data using bloc pattern following is the error:
'package:flutter/src/widgets/framework.dart': Failed assertion: line 5120 pos 12: 'child == _child': is not true.
My list file:
import 'package:Instant_Feedback/Dashboard/PeopleList/bloc/bloc.dart';
import 'package:Instant_Feedback/People/strongConnection_model.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
class PeopleListing extends StatefulWidget {
@override
State<StatefulWidget> createState() => _PeopleListingState();
}
class _PeopleListingState extends State<PeopleListing> {
PeopleListBloc peopleBloc;
@override
void initState() {
super.initState();
peopleBloc = BlocProvider.of<PeopleListBloc>(context);
peopleBloc.dispatch(DisplayPeopleList());
}
@override
Widget build(BuildContext context) {
return BlocBuilder(
bloc: peopleBloc,
builder: (context, state){
if (state is PeopleUninitializedState) {
print("PeopleUninitializedState");
} else if (state is PeopleFetchingState) {
print("PeopleFetchingState");
} else if (state is PeopleFetchingState) {
print("PeopleFetchingState");
} else {
final stateAsPeopleFetchedState = state as PeopleFetchedState;
final players = stateAsPeopleFetchedState.people;
return buildPeopleList(players);
}
},
);
}
Widget buildPeopleList(List<StrongConnection_model> people) {
print(people.length);
return Container(
child: Text('sdf sdkfh kdj'),
);
}
}
Problem is, builder()
expects a widget & you're not returning a valid widget in the if/else if
conditions. Try changing your code to the below version.
@override
Widget build(BuildContext context) {
return BlocBuilder(
bloc: peopleBloc,
builder: (context, state){
if (state is PeopleUninitializedState) {
<!-- Expects A Widget -->
print("PeopleUninitializedState");
return SizedBox();
} else if (state is PeopleFetchingState) {
<!-- Expects A Widget -->
print("PeopleFetchingState");
return SizedBox();
} else if (state is PeopleFetchingState) {
<!-- Expects A Widget -->
print("PeopleFetchingState");
return SizedBox();
} else {
final stateAsPeopleFetchedState = state as PeopleFetchedState;
final players = stateAsPeopleFetchedState.people;
return buildPeopleList(players);
}
},
);
}