Add german translation

lib/app.dart

@@ -1,6 +1,9 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
 
+import 'backend.dart';
 import 'home_screen.dart';
+import 'localizations.dart';
 
 /// A simple reminder app.
 ///
@@ -9,6 +12,15 @@ class MemorApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
+      localizationsDelegates: const [
+        MemorLocalizations.delegate,
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+      ],
+      supportedLocales: const [
+        Locale('en'),
+        Locale('de'),
+      ],
       theme: ThemeData(
         primaryColor: Colors.black,
         accentColor: Colors.amber,
@@ -21,6 +33,7 @@ class MemorApp extends StatelessWidget {
         ),
         fontFamily: 'Libertinus Sans',
       ),
+      builder: (context, child) => MemorBackend(child: child),
       home: HomeScreen(),
     );
   }

lib/backend.dart

@@ -8,6 +8,7 @@ import 'package:path/path.dart' as p;
 import 'package:path_provider/path_provider.dart' as pp;
 import 'package:rxdart/rxdart.dart';
 
+import 'localizations.dart';
 import 'memo.dart';
 
 /// Widget for managing resources and state for Memor.
@@ -40,16 +41,12 @@ class MemorBackendState extends State<MemorBackend> {
   final memos = BehaviorSubject.seeded(<Memo>[]);
 
   /// Whether the backend is currently loading.
-  /// 
+  ///
   /// If this is true, the UI should not call backend methods.
   bool loading = true;
 
   static const _fileName = 'memos.json';
 
-  static const _notificationDetails = NotificationDetails(
-      AndroidNotificationDetails('memor', 'Memor', 'Memor reminders'),
-      IOSNotificationDetails());
-
   final _notifications = FlutterLocalNotificationsPlugin();
   File _file;
 
@@ -133,12 +130,20 @@ class MemorBackendState extends State<MemorBackend> {
 
   /// Schedule a notification for a memo.
   Future<void> _schedule(Memo memo) async {
+    final l10n = MemorLocalizations.of(context);
     _notifications.schedule(
       memo.id,
-      'Reminder',
+      l10n.reminder,
       memo.text,
       memo.scheduled,
-      _notificationDetails,
+      NotificationDetails(
+        AndroidNotificationDetails(
+          'memor',
+          'Memor',
+          l10n.notificationDescription,
+        ),
+        IOSNotificationDetails(),
+      ),
       androidAllowWhileIdle: true,
     );
   }

lib/date_utils.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 
+import 'localizations.dart';
+
 /// Utilities for handling DateTime objects.
 extension DateUtils on DateTime {
   /// Create a new instance with identical values.
@@ -21,18 +23,20 @@ extension DateUtils on DateTime {
         time.minute,
       );
 
-  /// Get a string representation of the represented day suitable for display.
+  /// Get a localized string representation of the represented day suitable for
-  String get dateString {
+  /// display.
+  String dateString(BuildContext context) {
+    final l10n = MemorLocalizations.of(context);
     final now = DateTime.now();
     if (this.year == now.year && this.month == now.month) {
       if (this.day == now.day) {
-        return 'Today';
+        return l10n.today;
       } else if (this.day == now.day + 1) {
-        return 'Tomorrow';
+        return l10n.tomorrow;
       }
     }
 
-    final format = DateFormat.yMd();
+    final format = DateFormat.yMd(l10n.languageCode);
     return format.format(this);
   }
 

lib/home_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 
 import 'backend.dart';
 import 'date_utils.dart';
+import 'localizations.dart';
 import 'memo.dart';
 import 'memo_editor.dart';
 
@@ -25,10 +26,11 @@ class HomeScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final backend = MemorBackend.of(context);
+    final l10n = MemorLocalizations.of(context);
 
     return Scaffold(
       appBar: AppBar(
-        title: Text('Memor'),
+        title: Text(l10n.title),
       ),
       body: backend.loading
           ? Center(
@@ -46,7 +48,7 @@ class HomeScreen extends StatelessWidget {
                       itemBuilder: (context, index) {
                         final memo = memos[index];
                         final scheduled = memo.scheduled;
-                        final dateString = scheduled.dateString;
+                        final dateString = scheduled.dateString(context);
                         final timeOfDayString =
                             scheduled.timeOfDay.format(context);
 
@@ -66,7 +68,8 @@ class HomeScreen extends StatelessWidget {
                           ),
                           child: ListTile(
                             title: Text(memo.text),
-                            subtitle: Text('$dateString at $timeOfDayString'),
+                            subtitle: Text(
+                                l10n.scheduled(dateString, timeOfDayString)),
                             onTap: () async {
                               final result =
                                   await _showMemoEditor(context, memo);
@@ -79,9 +82,9 @@ class HomeScreen extends StatelessWidget {
                             await backend.deleteMemo(index);
                             Scaffold.of(context).showSnackBar(
                               SnackBar(
-                                content: Text('Deleted "${memo.text}"'),
+                                content: Text(l10n.deleted(memo.text)),
                                 action: SnackBarAction(
-                                  label: 'UNDO',
+                                  label: l10n.undo,
                                   onPressed: () async {
                                     await backend.addMemo(memo);
                                   },
@@ -95,7 +98,7 @@ class HomeScreen extends StatelessWidget {
                   } else {
                     return Center(
                       child: Text(
-                        'No reminders scheduled',
+                        l10n.noReminders,
                         style: Theme.of(context).textTheme.headline6.copyWith(
                               color: Colors.grey,
                             ),

lib/localizations.dart

@@ -0,0 +1,63 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+class MemorLocalizations {
+  static const delegate = MemorLocalizationsDelegate();
+
+  static MemorLocalizations of(BuildContext context) =>
+      Localizations.of<MemorLocalizations>(context, MemorLocalizations);
+
+  final String languageCode;
+
+  MemorLocalizations(this.languageCode);
+
+  bool get de => languageCode == 'de';
+
+  // Home screen
+
+  String get title => 'Memor';
+  String scheduled(String date, String time) =>
+      de ? '$date um $time' : '$date at $time';
+  String deleted(String msg) => de ? '"$msg" gelöscht' : 'Deleted "$msg"';
+  String get undo => de ? 'RÜCKGÄNGIG' : 'UNDO';
+  String get noReminders =>
+      de ? 'Keine Erinnerungen eingerichtet' : 'No reminders scheduled';
+
+  // Memo editor
+
+  String get editTitle => de ? 'Memo bearbeiten' : 'Edit memo';
+  String get addTitle => de ? 'Memo erstellen' : 'Create memo';
+  String get save => de ? 'SPEICHERN' : 'SAVE';
+  String get create => de ? 'ERSTELLEN' : 'CREATE';
+  String get memo => 'Memo';
+  String get date => de ? 'Datum' : 'Date';
+  String get time => de ? 'Zeit' : 'Time';
+
+  // Backend
+
+  String get notificationDescription =>
+      de ? 'Memors Erinnerungen' : 'Memor reminders';
+  String get reminder => de ? 'Erinnerung' : 'Reminder';
+
+  // Date utils
+
+  String get today => de ? 'Heute' : 'Today';
+  String get tomorrow => de ? 'Morgen' : 'Tomorrow';
+}
+
+class MemorLocalizationsDelegate
+    extends LocalizationsDelegate<MemorLocalizations> {
+  const MemorLocalizationsDelegate();
+
+  @override
+  bool isSupported(Locale locale) => ['en', 'de'].contains(locale.languageCode);
+
+  @override
+  Future<MemorLocalizations> load(Locale locale) {
+    return SynchronousFuture<MemorLocalizations>(
+        MemorLocalizations(locale.languageCode));
+  }
+
+  @override
+  bool shouldReload(MemorLocalizationsDelegate old) => false;
+}

lib/main.dart

@@ -1,12 +1,9 @@
 import 'package:flutter/widgets.dart';
 
-import 'backend.dart';
 import 'app.dart';
 
 void main() {
   runApp(
-    MemorBackend(
+    MemorApp(),
-      child: MemorApp(),
-    ),
   );
 }

lib/memo_editor.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 
+import 'localizations.dart';
 import 'memo.dart';
 import 'date_utils.dart';
 
@@ -46,15 +47,16 @@ class _MemoEditorState extends State<MemoEditor> {
 
   @override
   Widget build(BuildContext context) {
+    final l10n = MemorLocalizations.of(context);
     final theme = Theme.of(context);
 
     return Scaffold(
       appBar: AppBar(
-        title: Text(widget.memo != null ? 'Edit memo' : 'Add memo'),
+        title: Text(widget.memo != null ? l10n.editTitle : l10n.addTitle),
         actions: <Widget>[
           FlatButton(
             child: Text(
-              widget.memo != null ? 'SAVE' : 'CREATE',
+              widget.memo != null ? l10n.save : l10n.create,
               style: theme.textTheme.button.copyWith(
                 color: theme.colorScheme.onPrimary,
               ),
@@ -80,13 +82,13 @@ class _MemoEditorState extends State<MemoEditor> {
               maxLines: null,
               decoration: InputDecoration(
                 border: OutlineInputBorder(),
-                labelText: 'Memo',
+                labelText: l10n.memo,
               ),
             ),
           ),
           ListTile(
-            title: Text('Date'),
+            title: Text(l10n.date),
-            subtitle: Text(_date.dateString),
+            subtitle: Text(_date.dateString(context)),
             onTap: () async {
               final result = await showDatePicker(
                 context: context,
@@ -103,7 +105,7 @@ class _MemoEditorState extends State<MemoEditor> {
             },
           ),
           ListTile(
-            title: Text('Time'),
+            title: Text(l10n.time),
             subtitle: Text(_time.format(context)),
             onTap: () async {
               final result = await showTimePicker(

pubspec.yaml

@@ -8,6 +8,8 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  flutter_localizations:
+    sdk: flutter
   flutter_local_notifications:
   intl:
   meta: