Example of using the Dart internationalization package in Flutter

examples/stocks/lib/i18n/stock_messages_all.dart

+/**
+ * DO NOT EDIT. This is code generated via package:intl/generate_localized.dart
+ * This is a library that looks up messages for specific locales by
+ * delegating to the appropriate library.
+ */
+
+library messages_all;
+
+import 'dart:async';
+import 'package:intl/message_lookup_by_library.dart';
+import 'package:intl/src/intl_helpers.dart';
+import 'package:intl/intl.dart';
+
+import 'stock_messages_en.dart' as messages_en;
+import 'stock_messages_es.dart' as messages_es;
+
+
+Map<String, Function> _deferredLibraries = {
+  'en' : () => new Future.value(null),
+  'es' : () => new Future.value(null),
+};
+
+MessageLookupByLibrary _findExact(localeName) {
+  switch (localeName) {
+    case 'en' : return messages_en.messages;
+    case 'es' : return messages_es.messages;
+    default: return null;
+  }
+}
+
+/** User programs should call this before using [localeName] for messages.*/
+Future initializeMessages(String localeName) {
+  initializeInternalMessageLookup(() => new CompositeMessageLookup());
+  var lib = _deferredLibraries[Intl.canonicalizedLocale(localeName)];
+  var load = lib == null ? new Future.value(false) : lib();
+  return load.then((_) =>
+      messageLookup.addLocale(localeName, _findGeneratedMessagesFor));
+}
+
+MessageLookupByLibrary _findGeneratedMessagesFor(locale) {
+  var actualLocale = Intl.verifiedLocale(locale, (x) => _findExact(x) != null,
+      onFailure: (_) => null);
+  if (actualLocale == null) return null;
+  return _findExact(actualLocale);
+}

examples/stocks/lib/i18n/stock_messages_en.dart

+/**
+ * DO NOT EDIT. This is code generated via package:intl/generate_localized.dart
+ * This is a library that provides messages for a en locale. All the
+ * messages from the main program should be duplicated here with the same
+ * function name.
+ */
+
+library messages_en;
+import 'package:intl/intl.dart';
+import 'package:intl/message_lookup_by_library.dart';
+
+final messages = new MessageLookup();
+
+class MessageLookup extends MessageLookupByLibrary {
+
+  get localeName => 'en';
+  static market() => "MARKET";
+
+  static portfolio() => "PORTFOLIO";
+
+  static title() => "Stocks";
+
+
+  final messages = const {
+    "market" : market,
+    "portfolio" : portfolio,
+    "title" : title
+  };
+}
\ No newline at end of file

examples/stocks/lib/i18n/stock_messages_es.dart

+/**
+ * DO NOT EDIT. This is code generated via package:intl/generate_localized.dart
+ * This is a library that provides messages for a es locale. All the
+ * messages from the main program should be duplicated here with the same
+ * function name.
+ */
+
+library messages_es;
+import 'package:intl/intl.dart';
+import 'package:intl/message_lookup_by_library.dart';
+
+final messages = new MessageLookup();
+
+class MessageLookup extends MessageLookupByLibrary {
+
+  get localeName => 'es';
+  static market() => "MERCADO";
+
+  static portfolio() => "CARTERA";
+
+  static title() => "Acciones";
+
+
+  final messages = const {
+    "market" : market,
+    "portfolio" : portfolio,
+    "title" : title
+  };
+}
\ No newline at end of file

examples/stocks/lib/i18n/stocks_en.arb

+{
+  "title": "Stocks",
+  "@title": {
+    "description": "Title for the Stocks application",
+    "type": "text",
+    "placeholders": {}
+  },
+
+  "market": "MARKET",
+  "@market": {
+    "description": "Label for the Market tab",
+    "type": "text",
+    "placeholders": {}
+  },
+
+  "portfolio": "PORTFOLIO",
+  "@portfolio": {
+    "description": "Label for the Portfolio tab",
+    "type": "text",
+    "placeholders": {}
+  }
+}

examples/stocks/lib/i18n/stocks_es.arb

+{
+  "title": "Acciones",
+  "@title": {
+    "description": "Title for the Stocks application",
+    "type": "text",
+    "placeholders": {}
+  },
+
+  "market": "MERCADO",
+  "@market": {
+    "description": "Label for the Market tab",
+    "type": "text",
+    "placeholders": {}
+  },
+
+  "portfolio": "CARTERA",
+  "@portfolio": {
+    "description": "Label for the Portfolio tab",
+    "type": "text",
+    "placeholders": {}
+  }
+}

examples/stocks/lib/main.dart

@@ -13,8 +13,10 @@ import 'package:flutter/material.dart';
 import 'package:flutter/painting.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/scheduler.dart';
+import 'package:intl/intl.dart';
 
 import 'stock_data.dart';
+import 'i18n/stock_messages_all.dart';
 
 part 'stock_arrow.dart';
 part 'stock_home.dart';
@@ -22,6 +24,7 @@ part 'stock_list.dart';
 part 'stock_menu.dart';
 part 'stock_row.dart';
 part 'stock_settings.dart';
+part 'stock_strings.dart';
 part 'stock_symbol_viewer.dart';
 part 'stock_types.dart';
 
@@ -105,5 +108,7 @@ class StocksAppState extends State<StocksApp> {
 }
 
 void main() {
-  runApp(new StocksApp());
+  initializeMessages(Intl.defaultLocale).then((_) {
+    runApp(new StocksApp());
+  });
 }

examples/stocks/lib/stock_home.dart

@@ -147,7 +147,7 @@ class StockHomeState extends State<StockHome> {
   Widget buildToolBar() {
     return new ToolBar(
       elevation: 0,
-      center: new Text('Stocks'),
+      center: new Text(StockStrings.title()),
       right: <Widget>[
         new IconButton(
           icon: "action/search",
@@ -161,8 +161,8 @@ class StockHomeState extends State<StockHome> {
       tabBar: new TabBar(
         selection: _tabBarSelection,
         labels: <TabLabel>[
-          const TabLabel(text: 'MARKET'),
-          const TabLabel(text: 'PORTFOLIO')]
+          new TabLabel(text: StockStrings.market()),
+          new TabLabel(text: StockStrings.portfolio())]
       )
     );
   }

examples/stocks/lib/stock_strings.dart

+part of stocks;
+
+// Wrappers for strings that are shown in the UI.  The strings can be
+// translated for different locales using the Dart intl package.
+//
+// Locale-specific values for the strings live in the i18n/*.arb files.
+//
+// To generate the stock_messages_*.dart files from the ARB files, run:
+//   pub run intl:generate_from_arb --output-dir=lib/i18n --generated-file-prefix=stock_ --no-use-deferred-loading lib/stock_strings.dart lib/i18n/stocks_*.arb
+
+class StockStrings {
+  static String title() => Intl.message(
+    'Stocks',
+    name: 'title',
+    desc: 'Title for the Stocks application'
+  );
+
+  static String market() => Intl.message(
+    'MARKET',
+    name: 'market',
+    desc: 'Label for the Market tab'
+  );
+
+  static String portfolio() => Intl.message(
+    'PORTFOLIO',
+    name: 'portfolio',
+    desc: 'Label for the Portfolio tab'
+  );
+}

examples/stocks/pubspec.yaml

@@ -2,3 +2,5 @@ name: stocks
 dependencies:
   flutter:
     path: ../../packages/flutter
+
+  intl: '>=0.12.4+2 <0.13.0'