[DevFestKC]Go Global with Flutter Apps 101

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Kenichi Kambara (@korodroid) December 2, 2023 KC 2023 Go Global with Flutter Apps 101

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About me •Mobile App Development •Speeches (e.g. 15 Int’l/100+ Domestic) •Writings (e.g. 8 Dev Books) •[Of fi cial] Evangelist at NTT TechnoCross •[Private] iplatform.org Kenichi Kambara (X:@korodroid) NEW

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About my Flutter product (Private works) Sekaiphone Pro(Flutter/Kotlin/Swift) MyToDo(Flutter)

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Agenda •My Motivation •Various Language World •Supporting more Languages on Flutter •Extra Tips

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My Motivation

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My Motivation English/Japanese… 4ZTUFN-BOHVBHF4FUUJOHT Arabic

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Left To Right (LTR) World [e.g. Japan🇯🇵]

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Left To Right (LTR) World [e.g. Greece🇬🇷]

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Right To Left (RTL) World [e.g. Qatar🇶🇦/Egypt🇪🇬]

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What’s RTL (Right To Left)? Google Translation

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RTL (Right To Left) Speakers • Arabic: 310 million speakers/26 countries • Urdu: 101 million speakers • Hebrew: 9 million speakers • and some more… LingoHub: https://lingohub.com/academy/best-practices/rtl-language-list

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Supporting more Languages on Flutter 1. Checking RTL Basics 2. Getting Started for i18n 3. Testing our UI without modi fi cations 4. Deep Dive into Implementation Extra Tips for i18n with ChatGPT

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Wear OS ΞϓϦ։ൃೖ໳ with Jetpack Compose 1. Checking RTL Basics

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RTL Basics: Learning Guidelines https://m2.material.io/design/usability/bidirectionality.html

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RTL Basics: Learning Guidelines LTR World RTL World

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RTL Basics: Learning Guidelines ? ? LTR World RTL World LTR World RTL World

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RTL Basics: Learning Guidelines LTR World RTL World LTR World RTL World

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RTL Basics: Learning Guidelines LTR World RTL World ?

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RTL Basics: Learning Guidelines

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Wear OS ΞϓϦ։ൃೖ໳ with Jetpack Compose 2. Getting Started for i18n

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Flutter i18n packages • fl utter_localizations (Inspired by Flutter SDK) •slang (Of fi cial successor of “fast_i18n”) • fl utter_translate •easy_localization •getx (also famous as State Management ) •And more…

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fl utter_localizations https://docs. fl utter.dev/ui/accessibility-and-internationalization/internationalization

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Installing “ fl utter_localization”

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Setting Up 1/3 return MaterialApp( title: ‘App', localizationsDelegates: const [ GlobalMaterialLocalizations.delegate, GlobalWidgetsLocalizations.delegate, GlobalCupertinoLocalizations.delegate, ], supportedLocales: const [ Locale('en'), // English(LTR) Locale('ja'), // Japanese(LTR) Locale('ar'), // Arabic(RTL) ], import 'package:flutter_localizations/flutter_localizations.dart'; /lib/main.dart

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Setting Up 2/3 arb-dir: lib/l10n template-arb-file: app_en.arb output-localization-file: app_localizations.dart flutter: generate: true # Add this line /l10n.dart Create a new fi le called “l10n.dart” /pubspec.yaml

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Setting Up 3/3 { "greeting": "Hello" } Create some new fi les lib/l10n/app_en.arb { "greeting": "͜Μʹͪ͸" } { "greeting": "ﺎً ﺒﺣﺮﻣ" } lib/l10n/app_ja.arb lib/l10n/app_ar.arb > fl utter pub get Automatically Generated…

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Using resources /lib/main.dart Text(AppLocalizations.of(context)!.greeting); import 'package:flutter_gen/gen_l10n/app_localizations.dart';

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One problem…->Better Approach return MaterialApp( title: ‘App', localizationsDelegates: const [ GlobalMaterialLocalizations.delegate, GlobalWidgetsLocalizations.delegate, GlobalCupertinoLocalizations.delegate, ], supportedLocales: const [ Locale('en'), // English(LTR) Locale('ja'), // Japanese(LTR) Locale('ar'), // Arabic(RTL) ], return MaterialApp( title: ‘App', localizationsDelegates: AppLocalizations.localizationsDelegates, supportedLocales: AppLocalizations.supportedLocales,

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Wear OS ΞϓϦ։ൃೖ໳ with Jetpack Compose 3. Testing our UI without modi fi cations

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Testing our UI without modi fi cations Good Bad

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Found Problems (1) Good Bad

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Good Bad Found Problems (2)

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Good Bad Found Problems (3)

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Wear OS ΞϓϦ։ൃೖ໳ with Jetpack Compose 4. Deep Dive into Implementation

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Deep Dive 1 (Icon) b. Material a. Original on RTL on LTR

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a. Original Image.asset( 'assets/images/chara.png', matchTextDirection: true, ), on LTR on RTL

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b. Material https://api. fl utter.dev/ fl utter/material/Icons-class.html

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b. Material

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b. Material Icon( Icons.arrow_back, size: 80.0, ), on LTR on RTL

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b. Material Icon( Icons.attach_money, size: 80.0, ), on LTR on RTL

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Deep Dive 1 (Icon): Result on LTR on RTL

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Deep Dive 2 (Layout) Row( children: [ BlueArea(), GreyArea(), ], ), on LTR on RTL

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Deep Dive 2 (Layout) on LTR on RTL Row( mainAxisAlignment: MainAxisAlignment.start, children: [ BlueArea(), GreyArea(), ], ), Row( mainAxisAlignment: MainAxisAlignment.end, children: [ BlueArea(), GreyArea(), ], ),

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Deep Dive 2 (Layout): Result on LTR on RTL

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Deep Dive 3 (Text) Column( children: [ Text( “Text1", ), Text( “Text2", ), ], ), on LTR on RTL

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Deep Dive 3 (Text) Column( children: [ Text( “TextAlign.left", textAlign: TextAlign.left, ), Text( "TextAlign.right", textAlign: TextAlign.right, ), ], ), on LTR on RTL

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Deep Dive 3 (Text): Result old ver. new ver. LTR LTR RTL RTL

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Deep Dive 4 (Combined) on RTL

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Deep Dive 4 (Combined) on LTR Components(5 Image Widget in 1 Row)

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Deep dive 4 (Combined) How would it look on RTL devices with no modi fi cations?

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Deep Dive 4 (Combined) on RTL Components(The order of Widgets?)

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Deep Dive 4 (Combined) Any solutions?

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Deep Dive 4 (Combined) on LTR on RTL •Icon •Layout matchTextDirection: true for reversing Widget The order of each Widget is automatically reversed in a Row

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Deep Dive 4 (Combined): Result on LTR on RTL 㲔㲔 old ver.

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Deep Dive more Widget… 8JUIPVUDPOTJEFSJOH(MPCBM 8JUIDPOTJEFSJOH(MPCBM "MJHONFOU "MJHONFOU%JSFDUJPOBM #PSEFS #PSEFS%JSFDUJPOBM #PSEFS3BEJVT #PSEFS3BEJVT%JSFDUJPOBM &EHF*OTFUT &EHF*OTFUT%JSFDUJPOBM

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Wear OS ΞϓϦ։ൃೖ໳ with Jetpack Compose Extra Tips for i18n with ChatGPT

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Complicated Task…(Language Resources) English Arabic Japanese

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Examples of Language Resources // English Resource "en": { // Top Screen "appName": "SekaiPhone Pro", "modeTalkSpeech": "Talk Mode\n(Speech)", "modeTalkText": "Talk Mode\n(Text)", "modePhone": "Phone Mode", "modeCamera": "Camera Mode", // Hoge Screen // … }, // Japanese Resource "jp": { // Top Screen "appName": "SekaiPhone Pro", "modeTalkSpeech": “͜ͷ৔Ͱ຋༁\n(Ի੠)”, …

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Preparations with ChatGPT

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Reference Slide X: @korodroid

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Supporting more Languages for getting more Users🚀 Conclusion

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Please let me know if you have any requests such as technical speeches, technical writings and so on. Facebook:http://fb.com/kanbara.kenichi X:@korodroid LinkedIn:http://www.linkedin.com/in/korodroid Thank you so much