Set the default language in a Flutter application

Question

I am trying to support multiple languages in my apps. I want to support two languages in my apps: English (en) and Bahasa (id). But, I want my apps to use Bahasa as the default language. I have tried to do this using the plugin easy_localization.

Here is some code from my main.app file

return EasyLocalizationProvider(
      data: data,
      child: MaterialApp(
        debugShowCheckedModeBanner: false,
        title: APP_NAME,

        localizationsDelegates: [
          GlobalMaterialLocalizations.delegate,
          GlobalWidgetsLocalizations.delegate,
          //app-specific localization
          EasylocaLizationDelegate(
              locale: data.locale,
              path: 'assets/strings'
          ),
        ],
        navigatorKey: locator<NavigationService>().navigatorKey,

        supportedLocales: [ Locale('id', 'ID'), Locale('en', 'US')],
        locale: data.savedLocale,


        theme: ThemeData(
          primaryColor: KaskuColor.primary,
          accentColor: Color(0xFFCB0E00),
          fontFamily: PRIMARY_FONT_FAMILY,
          textTheme: TextTheme(
            headline: TextStyle(fontSize: 72.0, fontWeight: FontWeight.bold),
            title: TextStyle(fontSize: 36.0, fontStyle: FontStyle.italic),
            body1: TextStyle(fontSize: 14.0),
          ),
          primarySwatch: Colors.red,
          cursorColor: KaskuColor.primary,
          snackBarTheme: SnackBarThemeData(
            backgroundColor: KaskuColor.snackBarColor
          )
        ),

        home: Splashscreen(),
        routes: {


        },

      ),
    );

Can someone help me? Thanks in advance!

Answer 1

You need to use a callback to set a default language. In your MaterialApp widget add localeListResolutionCallback as following:-

MaterialApp(
   ...

   localeListResolutionCallback: (locales, supportedLocales) {

      print('device locales=$locales supported locales=$supportedLocales');

      for (Locale locale in locales) {
         // if device language is supported by the app,
         // just return it to set it as current app language
         if (supportedLocales.contains(locale)) {
            return locale;
         }
      }

      // if device language is not supported by the app,
      // the app will set it to english but return this to set to Bahasa instead
      return Locale('id', 'ID');
   },

   supportedLocales: [Locale('id', 'ID'), Locale('en', 'US')],
   locale: Locale('en', 'US'),
   ...
);