Flutter bloc - Getting data from DB asynchronously

Question

I am making an app using the BLoC architecture using the flutter_bloc package, but I need to get data from a database, which is asynchronous, meaning I can't initialize the BLoC with data from my database. Is there a way I can do this? My BLoC class text is

import 'package:countdown/database/utils.dart';
import 'package:countdown/events/countdown_event.dart';
import 'package:countdown/models/countdown.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class HomeBloc extends Bloc<CountdownEvent, List<Countdown>> {
   @override
  // TODO: implement initialState
  List<Countdown> get initialState => DatabaseUtils.getCountdowns();


  @override
  Stream<List<Countdown>> mapEventToState(CountdownEvent event) {
  }
}

I know this is very similar to This Question, but that question's answers don't have any code snippets which would be very helpful.

create one separate async function and call if from initState(). — xbadal
– xbadal, Commented May 18, 2020 at 22:28
initState() would still have to return a Future, which makes it an invalid override of the parent class. — Nailuj29
– Nailuj29, Commented May 18, 2020 at 23:39
" but I need to get data from a database, which is asynchronous," - so you need to read this amd this — pskink
– pskink, Commented May 19, 2020 at 3:57
The initialState has to be an instance of the type parameter State, which in my case is a List — Nailuj29
– Nailuj29, Commented May 19, 2020 at 13:02

xbadal · Accepted Answer · 2020-05-19 21:43:46Z

1

create one separate async function and call if from initState(). this is my code you can call your method according to use.

  @override
  HomeState get initialState {
    _checkLocationSettings();
    return InitialHomeState();
  }



_checkLocationSettings() async {
locationUpdateSetting = await repository.isLocationUpdateOn();}

edited May 19, 2020 at 21:43

answered May 19, 2020 at 21:28

xbadal

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