How to programmatically change the locale in Flutter?

There are several ways this can be done.
The main thing is to explicitly set the locale prop of the MaterialApp widget on language change.
Below, you can find an example of how to do that using the provider package.

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';

void main() {
  runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (context) => LocaleModel(),
      child: Consumer<LocaleModel>(
        builder: (context, localeModel, child) => MaterialApp(
          title: 'Your app title',
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          locale: localeModel.locale,
          /* ... */

class LocaleModel extends ChangeNotifier {
  Locale? _locale;

  Locale? get locale => _locale;

  void set(Locale locale) {
    _locale = locale;

Note: For more details, please check out an example on GitHub.

Flutter internationalization tutorial:

Copyrights 2024 © Localizely