added welcome page with terms of service

lib/main.dart

@@ -8,6 +8,7 @@ import 'package:aves/widgets/album/collection_page.dart';
 import 'package:aves/widgets/common/data_providers/media_store_collection_provider.dart';
 import 'package:aves/widgets/common/icons.dart';
 import 'package:aves/widgets/fullscreen/fullscreen_page.dart';
+import 'package:aves/widgets/welcome.dart';
 import 'package:firebase_crashlytics/firebase_crashlytics.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -26,9 +27,22 @@ void main() {
 
 enum AppMode { main, pick, view }
 
-class AvesApp extends StatelessWidget {
+class AvesApp extends StatefulWidget {
   static AppMode mode = AppMode.main;
 
+  @override
+  _AvesAppState createState() => _AvesAppState();
+}
+
+class _AvesAppState extends State<AvesApp> {
+  Future<void> _appSetup;
+
+  @override
+  void initState() {
+    super.initState();
+    _appSetup = settings.init();
+  }
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -50,7 +64,14 @@ class AvesApp extends StatelessWidget {
           ),
         ),
       ),
-      home: const HomePage(),
+      home: FutureBuilder(
+        future: _appSetup,
+        builder: (context, AsyncSnapshot<void> snapshot) {
+          if (snapshot.hasError) return const Icon(AIcons.error);
+          if (snapshot.connectionState != ConnectionState.done) return const SizedBox.shrink();
+          return settings.hasAcceptedTerms ? const HomePage() : const WelcomePage();
+        },
+      ),
     );
   }
 }
@@ -69,7 +90,6 @@ class _HomePageState extends State<HomePage> {
 
   @override
   void initState() {
-    debugPrint('$runtimeType initState');
     super.initState();
     _appSetup = _setup();
     imageCache.maximumSizeBytes = 512 * (1 << 20);
@@ -93,8 +113,6 @@ class _HomePageState extends State<HomePage> {
     // TODO notify when icons are ready for drawer and section header refresh
     await androidFileUtils.init(); // 170ms
 
-    await settings.init(); // <20ms
-
     final intentData = await ViewerService.getIntentData();
     if (intentData != null) {
       final action = intentData['action'];

lib/model/settings.dart

@@ -20,6 +20,7 @@ class Settings {
   static const collectionTileExtentKey = 'collection_tile_extent';
   static const infoMapZoomKey = 'info_map_zoom';
   static const catalogTimeZoneKey = 'catalog_time_zone';
+  static const hasAcceptedTermsKey = 'has_accepted_terms';
 
   Future<void> init() async {
     _prefs = await SharedPreferences.getInstance();
@@ -69,6 +70,10 @@ class Settings {
 
   set collectionTileExtent(double newValue) => setAndNotify(collectionTileExtentKey, newValue);
 
+  bool get hasAcceptedTerms => getBoolOrDefault(hasAcceptedTermsKey, false);
+
+  set hasAcceptedTerms(bool newValue) => setAndNotify(hasAcceptedTermsKey, newValue);
+
   // convenience methods
 
   bool getBoolOrDefault(String key, bool defaultValue) => _prefs.getKeys().contains(key) ? _prefs.getBool(key) : defaultValue;

lib/model/terms.dart

@@ -0,0 +1,15 @@
+const String termsAndConditions = '''
+# Terms of Service
+Aves is an open-source gallery and metadata explorer app allowing you to access and manage your local photos.
+
+You must use the app for legal, authorized and acceptable purposes.
+
+# Privacy policy
+Aves does not collect any personal data in its standard use. We never have access to your photos and videos. This also means that we cannot get them back for you if you delete them without backing them up.
+
+__We collect anonymous data to improve the app.__ We use Google Firebase for Analytics and Crash Reporting, and the anonymous analytics data are stored on their servers. Please note that those are anonymous data, there is absolutely nothing personal about those data.
+
+## Links
+[Sources](https://github.com/deckerst/aves)
+''';
+

lib/utils/constants.dart

@@ -107,6 +107,12 @@ class Constants {
       licenseUrl: 'https://github.com/CaiJingLong/flutter_ijkplayer/blob/master/LICENSE',
       sourceUrl: 'https://github.com/CaiJingLong/flutter_ijkplayer',
     ),
+    Dependency(
+      name: 'Flutter Markdown',
+      license: 'BSD 3-Clause',
+      licenseUrl: 'https://github.com/flutter/flutter_markdown/blob/master/LICENSE',
+      sourceUrl: 'https://github.com/flutter/flutter_markdown',
+    ),
     Dependency(
       name: 'Flutter Native Timezone',
       license: 'Apache 2.0',

lib/widgets/welcome.dart

@@ -0,0 +1,100 @@
+import 'package:aves/main.dart';
+import 'package:aves/model/settings.dart';
+import 'package:aves/model/terms.dart';
+import 'package:aves/widgets/common/aves_logo.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_markdown/flutter_markdown.dart';
+import 'package:url_launcher/url_launcher.dart';
+
+class WelcomePage extends StatefulWidget {
+  const WelcomePage();
+
+  @override
+  _WelcomePageState createState() => _WelcomePageState();
+}
+
+class _WelcomePageState extends State<WelcomePage> {
+  bool _hasAcceptedTerms = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final accentColor = Theme.of(context).accentColor;
+    return Scaffold(
+      body: SafeArea(
+        child: Container(
+          alignment: Alignment.center,
+          padding: const EdgeInsets.all(16.0),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              const AvesLogo(size: 64),
+              const SizedBox(height: 16),
+              const Text(
+                'Welcome to Aves',
+                style: TextStyle(
+                  fontSize: 22,
+                  fontFamily: 'Concourse',
+                ),
+              ),
+              const SizedBox(height: 16),
+              Flexible(
+                child: Container(
+                  padding: const EdgeInsets.all(16),
+                  decoration: BoxDecoration(
+                    borderRadius: BorderRadius.circular(16),
+                    color: Colors.white10,
+                  ),
+                  child: SingleChildScrollView(
+                    child: Container(
+                      child: MarkdownBody(
+                        data: termsAndConditions,
+                        onTapLink: (url) async {
+                          if (await canLaunch(url)) {
+                            await launch(url);
+                          }
+                        },
+                      ), // const Text('Terms terms terms'),
+                    ),
+                  ),
+                ),
+              ),
+              Text.rich(
+                TextSpan(
+                  children: [
+                    WidgetSpan(
+                      alignment: PlaceholderAlignment.middle,
+                      child: Checkbox(
+                        value: _hasAcceptedTerms,
+                        onChanged: (v) => setState(() => _hasAcceptedTerms = v),
+                        activeColor: accentColor,
+                      ),
+                    ),
+                    const TextSpan(
+                      text: 'I accept the Terms of Service',
+                    ),
+                  ],
+                ),
+              ),
+              RaisedButton(
+                color: accentColor,
+                child: const Text('Continue'),
+                onPressed: _hasAcceptedTerms
+                    ? () {
+                        settings.hasAcceptedTerms = true;
+                        Navigator.pushAndRemoveUntil(
+                          context,
+                          MaterialPageRoute(
+                            builder: (context) => const HomePage(),
+                          ),
+                          (route) => false,
+                        );
+                      }
+                    : null,
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}

pubspec.lock

@@ -125,6 +125,13 @@ packages:
       relative: true
     source: path
     version: "0.3.6"
+  flutter_markdown:
+    dependency: "direct main"
+    description:
+      name: flutter_markdown
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.4.1"
   flutter_native_timezone:
     dependency: "direct main"
     description:
@@ -212,6 +219,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.11.4"
+  markdown:
+    dependency: transitive
+    description:
+      name: markdown
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.4"
   matcher:
     dependency: transitive
     description:
@@ -555,4 +569,4 @@ packages:
     version: "3.6.1"
 sdks:
   dart: ">=2.7.2 <3.0.0"
-  flutter: ">=1.16.3 <2.0.0"
+  flutter: ">=1.17.0 <2.0.0"

pubspec.yaml

@@ -53,6 +53,7 @@ dependencies:
     path: ../flutter_ijkplayer
   #    git:
   #      url: git://github.com/deckerst/flutter_ijkplayer.git
+  flutter_markdown:
   flutter_native_timezone:
   flutter_staggered_animations:
   flutter_svg: