How to run async await code which is from store of provider inside initState-CodePudding

I'm trying to get data from API when my app starts. Therefore, I wrote the async await function at a store of Provider to bring API data. However, it doesn't work and sends 404 status code. How can I fix this problem?

main.dart codes

@override
  void initState(){
    super.initState();
    // this is the code from provider
    context.read<HomeData>().getData();
  }

  @override
  Widget build(BuildContext context) {
    return  DefaultTabController(
      length: 4,
      child: Scaffold(
        appBar: TopAppBar(
        ),
        body: BodyPage(
          changePage : _changePage,
          pageController : _pageController,
          currentIndex : _currentIndex,
        ),
        bottomNavigationBar: BottomBar(currentIndex: _currentIndex, pageController: _pageController),
        extendBodyBehindAppBar: true,
      ),
    );
  }

Provider Store codes

class HomeData extends ChangeNotifier {
  var homeData = [];
  var boardItem = {};

  late String _image;
  String get image => _image;
  late String _content;
  String get content => _content;
  var _now;
  DateTime get now => _now;

  // 처음 홈에서 렌더링 될 때 나오는 아이템 데이터를 불러옴
  getData() async{
    var rawData = await http.get(Uri.parse('https://codingapple1.github.io/app/Constants.json'));
    if (rawData.statusCode == 200) {
      homeData = jsonDecode(rawData.body);
      print(homeData);
    }
    else{
      print('statusCode : ${rawData.statusCode}');
    }

    notifyListeners();
  }
}

CodePudding user response：

As the issue is 404 means page is not found(available). Try rechecking the link path.

You will find context issue until first frame gets build. You can use addPostFrameCallback.

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
      await context.read<HomeData>().getData();
    });
  }

Also you can try using FutureBuilder.

CodePudding user response：

You can use FutureBuilder or WidgetsBinding or you can put it in your init state; Future.delayed(Duration.zero, ()async{await xx();},);