Flutter 升级：更新最新版本的 Flutter 之前的功能不起作用

Question

I have tried this function in flutter version v0.5.1 and it is working fine, no issue. After I have updated to the latest version v0.8.4 I get the exception below.

ExcceptionDatainheritFromWidgetOfExactType(_LocalizationsScope) was called before ProfileScreen.initState() completed.

        When an inherited widget changes, for example if the value of Theme.of() changes, its dependent widgets are rebuilt. If the dependent widget's reference to the inherited widget is in a constructor or an initState() method, then the rebuilt dependent widget will not reflect the changes in the inherited widget.
        Typically references to to inherited widgets should occur in widget build() methods. Alternatively, initialization based on inherited widgets can be placed in the didChangeDependencies method, which is called after initState and whenever the dependencies change thereafter.

  @override
  void initState() {
    super.initState();
    makeRequest();
  }
  Future<DataModel> makeRequest() async {
    _onLoading();

    http.Response response = await http.get(Uri.encodeFull(getProfile),
        headers: {"Accept": "application/json"});

   /// json data calling.....
  }

  void _onLoading() {

    if (loadCheck) {
        showDialog(
            context: context,
            barrierDismissible: false,
            builder: (BuildContext context) {
              return new Dialog(
                // progress dialog calling );
            }
        );
    } else {
      Navigator.pop(context);
    }
  }

Answer 1

You need the context from

@override Widget build(BuildContext context) {
....
....
makeRequest() 

method paste after Widget build... and pass parameter (context) into parenthesis like this

makeRequest(context) 

and again

_onLoading(context) 

and use

showDialog(
        context: context, //The context from Widget Build(BuildContext context)...

It is a common problem if you use Provider and InitState.