Add about screen

lib/about_screen.dart

@@ -0,0 +1,112 @@
+import 'package:flutter/gestures.dart';
+import 'package:flutter/material.dart';
+import 'package:url_launcher/url_launcher.dart' as url;
+
+import 'localizations.dart';
+
+class AboutScreen extends StatelessWidget {
+  static const _email = 'mailto:johrpan@gmail.com?subject=Memor';
+  static const _license = 'https://www.gnu.org/licenses/gpl-3.0.html';
+  static const _github = 'https://github.com/johrpan/memor';
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = MemorLocalizations.of(context);
+    final theme = Theme.of(context);
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(l10n.about),
+      ),
+      body: ListView(
+        padding: const EdgeInsets.all(16.0),
+        children: <Widget>[
+          Text(
+            l10n.introTitle,
+            style: theme.textTheme.headline6,
+          ),
+          SizedBox(
+            height: 12.0,
+          ),
+          Text(l10n.intro),
+          SizedBox(
+            height: 24.0,
+          ),
+          Text(
+            l10n.contactTitle,
+            style: theme.textTheme.headline6,
+          ),
+          SizedBox(
+            height: 12.0,
+          ),
+          RichText(
+            text: TextSpan(
+              style: theme.textTheme.bodyText1,
+              children: [
+                TextSpan(
+                  text: l10n.contact1,
+                ),
+                TextSpan(
+                  text: l10n.contact2,
+                  style: theme.textTheme.bodyText1.copyWith(
+                    color: Colors.amber[700],
+                    decoration: TextDecoration.underline,
+                  ),
+                  recognizer: TapGestureRecognizer()
+                    ..onTap = () => url.launch(_email),
+                ),
+                TextSpan(
+                  text: l10n.contact3,
+                ),
+                TextSpan(
+                  text: l10n.contact4,
+                  style: theme.textTheme.bodyText1.copyWith(
+                    color: Colors.amber[700],
+                    decoration: TextDecoration.underline,
+                  ),
+                  recognizer: TapGestureRecognizer()
+                    ..onTap = () => url.launch(_github),
+                ),
+                TextSpan(
+                  text: l10n.contact5,
+                ),
+              ],
+            ),
+          ),
+          SizedBox(
+            height: 24.0,
+          ),
+          Text(
+            l10n.licenseTitle,
+            style: theme.textTheme.headline6,
+          ),
+          SizedBox(
+            height: 12.0,
+          ),
+          RichText(
+            text: TextSpan(
+              style: theme.textTheme.bodyText1,
+              children: [
+                TextSpan(
+                  text: l10n.license1,
+                ),
+                TextSpan(
+                  text: l10n.license2,
+                  style: theme.textTheme.bodyText1.copyWith(
+                    color: Colors.amber[700],
+                    decoration: TextDecoration.underline,
+                  ),
+                  recognizer: TapGestureRecognizer()
+                    ..onTap = () => url.launch(_license),
+                ),
+                TextSpan(
+                  text: l10n.license3,
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/home_screen.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 
+import 'about_screen.dart';
 import 'backend.dart';
 import 'date_utils.dart';
 import 'localizations.dart';
@@ -31,6 +32,26 @@ class HomeScreen extends StatelessWidget {
     return Scaffold(
       appBar: AppBar(
         title: Text(l10n.title),
+        actions: <Widget>[
+          PopupMenuButton(
+            itemBuilder: (context) => [
+              PopupMenuItem(
+                value: 0,
+                child: Text(l10n.about),
+              ),
+            ],
+            onSelected: (value) {
+              if (value == 0) {
+                Navigator.push(
+                  context,
+                  MaterialPageRoute(
+                    builder: (context) => AboutScreen(),
+                  ),
+                );
+              }
+            },
+          ),
+        ],
       ),
       body: backend.loading
           ? Center(

lib/localizations.dart

@@ -23,6 +23,41 @@ class MemorLocalizations {
   String get noReminders =>
       de ? 'Keine Erinnerungen eingerichtet' : 'No reminders scheduled';
 
+  // About screen
+
+  String get about => de ? 'Über Memor' : 'About Memor';
+  String get introTitle => de ? 'Einführung' : 'Introduction';
+  String get intro => de
+      ? 'Memor ist eine Anwendung, die Sie zu bestimmten Zeiten mit einer '
+          'Benachrichtigung an etwas erinnern kann. Sie wurde mit dem Ziel '
+          'entwickelt möglichst einfach, schlicht und elegant zu sein.'
+      : 'Memor is an app for getting reminders at a specified time via a '
+          'notification. It was developed with the goal to be as simple and '
+          'elegant as possible.';
+  String get licenseTitle => de ? 'Lizenz' : 'License';
+  String get license1 => '© 2020 Elias Projahn\n\n'
+      'This program is free software: you can redistribute it and/or modify it '
+      'under the terms of the GNU General Public License as published by the '
+      'Free Software Foundation, either version 3 of the License, or (at your '
+      'option) any later version.\n\nThis program is distributed in the hope '
+      'that it will be useful, but WITHOUT ANY WARRANTY; without even the '
+      'implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR '
+      'PURPOSE. See the ';
+  String get license2 => 'GNU General Public License';
+  String get license3 => ' for more details.';
+  String get contactTitle => de ? 'Kontakt' : 'Contact';
+  String get contact1 => de
+      ? 'Für Fragen, Fehlermeldungen, Anregungen etc. können Sie mich gerne '
+      : 'Feel free to contact me ';
+  String get contact2 => de ? 'per E-Mail' : 'via E-mail';
+  String get contact3 => de
+      ? ' kontaktieren. Memor ist freie Software. Sie können bei '
+      : ' for questions, bug reports, ideas etc. Memor is free software. You '
+          'can study the source code and contribute on ';
+  String get contact4 => 'GitHub';
+  String get contact5 =>
+      de ? ' den Quellcode studieren und zur Entwicklung beitragen.' : '.';
+
   // Memo editor
 
   String get editTitle => de ? 'Memo bearbeiten' : 'Edit memo';

pubspec.yaml

@@ -16,6 +16,7 @@ dependencies:
   path:
   path_provider:
   rxdart:
+  url_launcher:
 
 flutter:
   uses-material-design: true