Unhandled Exception: inheritFromWidgetOfExactType(_LocalizationsScope) or inheritFromElement() was called before _ScreenState.initState() completed

Question

I am calling initial method to load data from API using initState. But it is resulting me an error. Here is error:

Unhandled Exception: inheritFromWidgetOfExactT         


        

Answer 1

Use after_init package to handle this issue

Adds a didInitState() lifecycle method to stateful widgets where you can safely access inherited widgets.

InheritedWidget is heavily used throughout the Flutter framework. Many state management packages such as ScopedModel and Provider use it as well. Unfortunately, InheritedWidgets are not accessible from the initState() method of State.

Example:

import 'package:flutter/material.dart';
import 'package:after_init/after_init.dart';

void main() {
  runApp(
    MaterialApp(
      home: Scaffold(
        body: Example(),
      ),
    ),
  );
}

class Example extends StatefulWidget {
  @override
  _ExampleState createState() => _ExampleState();
}

class _ExampleState extends State with AfterInitMixin {
  Size size;

  /// This gets called first, as usual.
  @override
  void initState() {
    super.initState();
    // Your code here
  }

  /// This gets called after initState(), only once.
  /// Safely access inherited widgets here.
  @override
  void didInitState() {
    // No need to call super.didInitState().
    // setState() is not required because build() will automatically be called by Flutter.
    size = MediaQuery.of(context).size;
  }

  /// This gets called after didInitState().
  /// And anytime the widget's dependencies change, as usual.
  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    // Your code here
  }

  /// Finally this gets called, as usual.
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text(size.toString()),
    );
  }
}