Really simple Flutter localization abstract

localize_and_translate

Flutter Localization In Human Way, Help with localizing your app.

Tutorial

Video

Methods

Method	Job
init()	initialize things, before runApp()
translate('word')	word translation
translate('word',{"key":"value"})	word translation with replacement arguments
<!--	googleTranslate('word', from: 'en', to: 'ar')
setNewLanguage(context,newLanguage:'en',restart: true, remember: true,)	change language
isDirectionRTL()	is Direction RTL check
currentLanguage	Active language code
locale	Active Locale
locals()	Locales list
delegates	Localization Delegates

Installation

• add .json translation files as assets

• For example : 'assets/langs/ar.json' | 'assets/langs/en.json'
• structure should look like

{
  "appTitle" : "تطبيق",
  "textArea" : "Thisi is just a test text"
}

• define them as assets in pubspec.yaml

flutter:
  assets:
    - assets/langs/en.json
    - assets/langs/ar.json

Initialization

• Add imports to main.dart
• Make main() async and do the following
• Ensure flutter activated WidgetsFlutterBinding.ensureInitialized()
• Define languages list LIST_OF_LANGS
• Define assets directory LANGS_DIR
• Initialize await translator.init();
• Inside runApp() wrap entry class with LocalizedApp()
• Note : ** make sure you define it's child into different place "NOT INSIDE" **

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

main() async {
  // if your flutter > 1.7.8 :  ensure flutter activated
  WidgetsFlutterBinding.ensureInitialized();

  LIST_OF_LANGS = ['ar', 'en']; // define languages
  LANGS_DIR = 'assets/langs/'; // define directory
  await translator.init(); // intialize

  runApp(
    LocalizedApp(
      child: MyApp(),
    ),
  );
}

• LocalizedApp() child example -> MaterialApp()

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Home(),
      localizationsDelegates: translator.delegates, // Android + iOS Delegates
      locale: translator.locale, // Active locale
      supportedLocales: translator.locals(), // Locals list
    );
  }
}

Usage

• use translate("appTitle")
• use googleTranslate("test", from: 'en', to: 'ar')
• use `setNewLanguage(context, newLanguage: 'ar', remember: true, restart: true);

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  String testText =
      translator.currentLanguage == 'ar' ? 'جار الترجمة' : 'Translating..';

  @override
  void initState() {
    super.initState();
    Future.delayed(Duration.zero, () async {
      testText = await translator.googleTranslate(
        testText,
        from: 'en',
        to: translator.currentLanguage,
      );
      setState(() {});
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      drawer: Drawer(),
      appBar: AppBar(
        title: Text(translator.translate('appTitle')),
        // centerTitle: true,
      ),
      body: Container(
        width: double.infinity,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: <Widget>[
            SizedBox(height: 50),
            Text(
              translator.translate('textArea'),
              textAlign: TextAlign.center,
              style: TextStyle(fontSize: 35),
            ),
            Text(
              testText,
              textAlign: TextAlign.center,
              style: TextStyle(fontSize: 35),
            ),
            OutlineButton(
              onPressed: () {
                translator.setNewLanguage(
                  context,
                  newLanguage: translator.currentLanguage == 'ar' ? 'en' : 'ar',
                  remember: true,
                  restart: true,
                );
              },
              child: Text(translator.translate('buttonTitle')),
            ),
          ],
        ),
      ),
    );
  }
}

GitHub

https://github.com/msayed-net/localize_and_translate