How to change language promatically

[falll2000]

I use this plug-in can change language when app start-up.

But if I want to change language programmatically, who to do so.

ex: change language when I click a button.

thanks a lot :)

[NMateu]

hi,
this should help you https://gist.github.com/ilikerobots/474b414138f3f99150dbb3d0cc4cc721

[long1eu]

Thanks @NMateu

[etet2007]

But it seems that you have to change the state of MaterialApp, and this will reload the entire app. Is there any ways to change language in a setting page but not reload the app? Thanks!

[long1eu]

I don't see the problem rebuilding the MaterialApp widget.

[etet2007]

I don't see the problem rebuilding the MaterialApp widget.

It's usable but other widgets will lose their states. I think it's best to stay in the same page after you change language.
https://github.com/flutterchina/gitme
This app is an example.

[long1eu]

No they won't lose their state. They will be rebuilt with the new Localization parent. Can you provide a MWE ? Maybe I don't get it right.

[etet2007]

No they won't lose their state. They will be rebuilt with the new Localization parent. Can you provide a MWE ? Maybe I don't get it right.

You are right. It's my mistake. There is another problem to make my app reload.

What's more. I find that we can change locale field in MaterialApp to "change language promatically ".

class _AppState extends State<App> {

  var locale;
  changeLocale(Locale locale) {
    setState(() {
      this.locale = locale;
    });
  }

  @override
  Widget build(BuildContext context) {
    return LocaleWidget(
      child: MaterialApp(
        title: UIData.appName,
        locale: locale,     // THIS
        home: MainPage(),
        localizationsDelegates: [
          S.delegate,
          GlobalMaterialLocalizations.delegate,
          GlobalWidgetsLocalizations.delegate,
        ],
        supportedLocales: S.delegate.supportedLocales,
      ),
      changeLocale: changeLocale,
    );
  }

Your plugin is so great. I am deeply grateful for you help.