Updated version

README.md

@@ -1,21 +1,25 @@
-# ![](./android/app/src/main/res/drawable/ic_notification.png) Obtainium
+# ![Obtainium Icon](./android/app/src/main/res/drawable/ic_notification.png) Obtainium
 
 Get Android App Updates Directly From the Source.
 
 Obtainium allows you to install and update Open-Source Apps directly from their releases pages, and receive notifications when new releases are made available.
 
-Currently supported App sources:
-- GitHub
-- GitLab
-
 Motivation: [Side Of Burritos - You should use this instead of F-Droid | How to use app RSS feed](https://youtu.be/FFz57zNR_M0)
 
+Currently supported App sources:
+- [GitHub](https://github.com/)
+- [GitLab](https://gitlab.com/)
+- [F-Droid](https://f-droid.org/)
+- [Mullvad](https://mullvad.net/en/)
+- [Signal](https://signal.org/)
+
 ## Limitations
 - App installs are assumed to have succeeded; failures and cancelled installs cannot be detected.
 - Auto (unattended) updates are unsupported due to a lack of any capable Flutter plugin.
+- For some sources, data is gathered using Web scraping and can easily break due to changes in website design. In such cases, more reliable methods are either unavailable (e.g. Mullvad), insufficient (e.g. GitHub RSS) or subject to rate limits (e.g. GitHub API).
 
 ## Screenshots
 
-| <img src="./screenshots/1.apps.png" alt="Apps Page" /> | <img src="./screenshots/2.dark_theme.png" alt="Dark Theme" />           | <img src="./screenshots/3.material_you.png" alt="Material You" />    |
+| <img src="./assets/screenshots/1.apps.png" alt="Apps Page" /> | <img src="./assets/screenshots/2.dark_theme.png" alt="Dark Theme" />           | <img src="./assets/screenshots/3.material_you.png" alt="Material You" />    |
 | ------------------------------------------------------ | ----------------------------------------------------------------------- | -------------------------------------------------------------------- |
-| <img src="./screenshots/4.app.png" alt="App Page" />   | <img src="./screenshots/5.apk_picker.png" alt="Multiple APK Support" /> | <img src="./screenshots/6.apk_install.png" alt="App Installation" /> |
+| <img src="./assets/screenshots/4.app.png" alt="App Page" />   | <img src="./assets/screenshots/5.apk_picker.png" alt="Multiple APK Support" /> | <img src="./assets/screenshots/6.apk_install.png" alt="App Installation" /> |

lib/main.dart

@@ -11,16 +11,18 @@ import 'package:workmanager/workmanager.dart';
 import 'package:dynamic_color/dynamic_color.dart';
 
 const String currentReleaseTag =
-    'v0.1.3-beta'; // KEEP THIS IN SYNC WITH GITHUB RELEASES
+    'v0.1.7-beta'; // KEEP THIS IN SYNC WITH GITHUB RELEASES
 
 @pragma('vm:entry-point')
 void bgTaskCallback() {
   // Background update checking process
   Workmanager().executeTask((task, taskName) async {
-    var appsProvider = AppsProvider(bg: true);
     var notificationsProvider = NotificationsProvider();
     await notificationsProvider.notify(checkingUpdatesNotification);
     try {
+      var appsProvider = AppsProvider();
+      await notificationsProvider
+          .cancel(ErrorCheckingUpdatesNotification('').id);
       await appsProvider.loadApps();
       List<App> updates = await appsProvider.checkUpdates();
       if (updates.isNotEmpty) {
@@ -50,7 +52,11 @@ void main() async {
   );
   runApp(MultiProvider(
     providers: [
-      ChangeNotifierProvider(create: (context) => AppsProvider()),
+      ChangeNotifierProvider(
+          create: (context) => AppsProvider(
+              shouldLoadApps: true,
+              shouldCheckUpdatesAfterLoad: true,
+              shouldDeleteAPKs: true)),
       ChangeNotifierProvider(create: (context) => SettingsProvider()),
       Provider(create: (context) => NotificationsProvider())
     ],
@@ -69,12 +75,7 @@ class MyApp extends StatelessWidget {
     AppsProvider appsProvider = context.read<AppsProvider>();
 
     if (settingsProvider.prefs == null) {
-      settingsProvider.initializeSettings().then((value) {
-        // Delete past downloads and check for updates every time the app is launched
-        // Only runs once as the settings are only initialized once (so not on every build)
-        appsProvider.deleteSavedAPKs();
-        appsProvider.checkUpdates();
-      });
+      settingsProvider.initializeSettings();
     } else {
       // Register the background update task according to the user's setting
       Workmanager().registerPeriodicTask('bg-update-check', 'bg-update-check',
@@ -87,12 +88,14 @@ class MyApp extends StatelessWidget {
         // If this is the first run, ask for notification permissions and add Obtainium to the Apps list
         Permission.notification.request();
         appsProvider.saveApp(App(
-            'imranr98_obtainium_github',
+            'imranr98_obtainium_${GitHub().host}',
             'https://github.com/ImranR98/Obtainium',
             'ImranR98',
             'Obtainium',
             currentReleaseTag,
-            currentReleaseTag, []));
+            currentReleaseTag,
+            [],
+            0));
       }
     }
 
@@ -123,7 +126,8 @@ class MyApp extends StatelessWidget {
               useMaterial3: true,
               colorScheme: settingsProvider.theme == ThemeSettings.light
                   ? lightColorScheme
-                  : darkColorScheme),
+                  : darkColorScheme,
+              fontFamily: 'Metropolis'),
           home: const HomePage());
     });
   }

lib/pages/add_app.dart

@@ -1,9 +1,11 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:obtainium/pages/app.dart';
 import 'package:obtainium/providers/apps_provider.dart';
 import 'package:obtainium/providers/settings_provider.dart';
 import 'package:obtainium/providers/source_provider.dart';
 import 'package:provider/provider.dart';
+import 'package:url_launcher/url_launcher_string.dart';
 
 class AddAppPage extends StatefulWidget {
   const AddAppPage({super.key});
@@ -19,77 +21,114 @@ class _AddAppPageState extends State<AddAppPage> {
 
   @override
   Widget build(BuildContext context) {
+    SourceProvider sourceProvider = SourceProvider();
     return Center(
-        child: Form(
-      key: _formKey,
-      child: Column(
-        crossAxisAlignment: CrossAxisAlignment.stretch,
-        children: [
-          const Spacer(),
-          Padding(
-              padding: const EdgeInsets.symmetric(horizontal: 16.0),
-              child: TextFormField(
-                decoration: const InputDecoration(
-                    hintText: 'https://github.com/Author/Project',
-                    helperText: 'Enter the App source URL'),
-                controller: urlInputController,
-                validator: (value) {
-                  if (value == null ||
-                      value.isEmpty ||
-                      Uri.tryParse(value) == null) {
-                    return 'Please enter a supported source URL';
-                  }
-                  return null;
-                },
-              )),
-          Padding(
-            padding:
-                const EdgeInsets.symmetric(vertical: 16.0, horizontal: 16.0),
-            child: ElevatedButton(
-              onPressed: gettingAppInfo
-                  ? null
-                  : () {
-                      if (_formKey.currentState!.validate()) {
-                        setState(() {
-                          gettingAppInfo = true;
-                        });
-                        sourceProvider()
-                            .getApp(urlInputController.value.text)
-                            .then((app) {
-                          var appsProvider = context.read<AppsProvider>();
-                          var settingsProvider =
-                              context.read<SettingsProvider>();
-                          if (appsProvider.apps.containsKey(app.id)) {
-                            throw 'App already added';
-                          }
-                          settingsProvider.getInstallPermission().then((_) {
-                            appsProvider.saveApp(app).then((_) {
-                              urlInputController.clear();
-                              Navigator.push(
-                                  context,
-                                  MaterialPageRoute(
-                                      builder: (context) =>
-                                          AppPage(appId: app.id)));
-                            });
-                          });
-                        }).catchError((e) {
-                          ScaffoldMessenger.of(context).showSnackBar(
-                            SnackBar(content: Text(e.toString())),
-                          );
-                        }).whenComplete(() {
-                          setState(() {
-                            gettingAppInfo = false;
-                          });
-                        });
-                      }
-                    },
-              child: const Text('Add'),
-            ),
-          ),
-          const Spacer(),
-          if (gettingAppInfo) const LinearProgressIndicator(),
-        ],
-      ),
-    ));
+      child: Form(
+          key: _formKey,
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              Container(),
+              Padding(
+                padding: const EdgeInsets.all(16),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.stretch,
+                  children: [
+                    TextFormField(
+                      decoration: const InputDecoration(
+                          hintText: 'https://github.com/Author/Project',
+                          helperText: 'Enter the App source URL'),
+                      controller: urlInputController,
+                      validator: (value) {
+                        if (value == null ||
+                            value.isEmpty ||
+                            Uri.tryParse(value) == null) {
+                          return 'Please enter a supported source URL';
+                        }
+                        return null;
+                      },
+                    ),
+                    Padding(
+                      padding: const EdgeInsets.symmetric(vertical: 16.0),
+                      child: ElevatedButton(
+                        onPressed: gettingAppInfo
+                            ? null
+                            : () {
+                                HapticFeedback.mediumImpact();
+                                if (_formKey.currentState!.validate()) {
+                                  setState(() {
+                                    gettingAppInfo = true;
+                                  });
+                                  sourceProvider
+                                      .getApp(urlInputController.value.text)
+                                      .then((app) {
+                                    var appsProvider =
+                                        context.read<AppsProvider>();
+                                    var settingsProvider =
+                                        context.read<SettingsProvider>();
+                                    if (appsProvider.apps.containsKey(app.id)) {
+                                      throw 'App already added';
+                                    }
+                                    settingsProvider
+                                        .getInstallPermission()
+                                        .then((_) {
+                                      appsProvider.saveApp(app).then((_) {
+                                        urlInputController.clear();
+                                        Navigator.push(
+                                            context,
+                                            MaterialPageRoute(
+                                                builder: (context) =>
+                                                    AppPage(appId: app.id)));
+                                      });
+                                    });
+                                  }).catchError((e) {
+                                    ScaffoldMessenger.of(context).showSnackBar(
+                                      SnackBar(content: Text(e.toString())),
+                                    );
+                                  }).whenComplete(() {
+                                    setState(() {
+                                      gettingAppInfo = false;
+                                    });
+                                  });
+                                }
+                              },
+                        child: const Text('Add'),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+              Column(crossAxisAlignment: CrossAxisAlignment.center, children: [
+                const Text(
+                  'Supported Sources:',
+                  // style: TextStyle(fontWeight: FontWeight.bold),
+                  // style: Theme.of(context).textTheme.bodySmall,
+                ),
+                const SizedBox(
+                  height: 8,
+                ),
+                ...sourceProvider
+                    .getSourceHosts()
+                    .map((e) => GestureDetector(
+                        onTap: () {
+                          launchUrlString('https://$e',
+                              mode: LaunchMode.externalApplication);
+                        },
+                        child: Text(
+                          e,
+                          style: const TextStyle(
+                              decoration: TextDecoration.underline,
+                              fontStyle: FontStyle.italic),
+                        )))
+                    .toList()
+              ]),
+              if (gettingAppInfo)
+                const LinearProgressIndicator()
+              else
+                Container(),
+            ],
+          )),
+    );
   }
 }

lib/pages/app.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:obtainium/providers/apps_provider.dart';
 import 'package:webview_flutter/webview_flutter.dart';
 import 'package:provider/provider.dart';
@@ -45,11 +46,17 @@ class _AppPageState extends State<AppPage> {
                                             appsProvider
                                                 .checkAppObjectForUpdate(
                                                     app!.app)) &&
-                                        app?.downloadProgress == null
+                                        !appsProvider.areDownloadsRunning()
                                     ? () {
+                                        HapticFeedback.heavyImpact();
                                         appsProvider
                                             .downloadAndInstallLatestApp(
-                                                [app!.app.id], context);
+                                                [app!.app.id],
+                                                context).then((res) {
+                                          if (res && mounted) {
+                                            Navigator.of(context).pop();
+                                          }
+                                        });
                                       }
                                     : null,
                                 child: Text(app?.app.installedVersion == null
@@ -60,6 +67,7 @@ class _AppPageState extends State<AppPage> {
                           onPressed: app?.downloadProgress != null
                               ? null
                               : () {
+                                  HapticFeedback.lightImpact();
                                   showDialog(
                                       context: context,
                                       builder: (BuildContext ctx) {
@@ -70,6 +78,7 @@ class _AppPageState extends State<AppPage> {
                                           actions: [
                                             TextButton(
                                                 onPressed: () {
+                                                  HapticFeedback.heavyImpact();
                                                   appsProvider
                                                       .removeApp(app!.app.id)
                                                       .then((_) {
@@ -82,6 +91,7 @@ class _AppPageState extends State<AppPage> {
                                                 child: const Text('Remove')),
                                             TextButton(
                                                 onPressed: () {
+                                                  HapticFeedback.lightImpact();
                                                   Navigator.of(context).pop();
                                                 },
                                                 child: const Text('Cancel'))

lib/pages/apps.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:obtainium/pages/app.dart';
 import 'package:obtainium/providers/apps_provider.dart';
 import 'package:obtainium/providers/settings_provider.dart';
@@ -21,11 +22,10 @@ class _AppsPageState extends State<AppsPage> {
         floatingActionButton: existingUpdateAppIds.isEmpty
             ? null
             : ElevatedButton.icon(
-                onPressed: appsProvider.apps.values
-                        .where((element) => element.downloadProgress != null)
-                        .isNotEmpty
+                onPressed: appsProvider.areDownloadsRunning()
                     ? null
                     : () {
+                        HapticFeedback.heavyImpact();
                         context
                             .read<SettingsProvider>()
                             .getInstallPermission()
@@ -45,7 +45,10 @@ class _AppsPageState extends State<AppsPage> {
                       style: Theme.of(context).textTheme.headline4,
                     )
                   : RefreshIndicator(
-                      onRefresh: appsProvider.checkUpdates,
+                      onRefresh: () {
+                        HapticFeedback.lightImpact();
+                        return appsProvider.checkUpdates();
+                      },
                       child: ListView(
                         children: appsProvider.apps.values
                             .map(
@@ -55,7 +58,7 @@ class _AppsPageState extends State<AppsPage> {
                                     e.app.installedVersion ?? 'Not Installed'),
                                 trailing: e.downloadProgress != null
                                     ? Text(
-                                        'Downloading - ${e.downloadProgress!.toInt()}%')
+                                        'Downloading - ${e.downloadProgress?.toInt()}%')
                                     : (e.app.installedVersion != null &&
                                             e.app.installedVersion !=
                                                 e.app.latestVersion

lib/pages/home.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:obtainium/pages/add_app.dart';
 import 'package:obtainium/pages/apps.dart';
 import 'package:obtainium/pages/settings.dart';
@@ -20,22 +21,34 @@ class _HomePageState extends State<HomePage> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(title: const Text('Obtainium')),
-      body: pages.elementAt(selectedIndex),
-      bottomNavigationBar: NavigationBar(
-        destinations: const [
-          NavigationDestination(icon: Icon(Icons.settings), label: 'Settings'),
-          NavigationDestination(icon: Icon(Icons.apps), label: 'Apps'),
-          NavigationDestination(icon: Icon(Icons.add), label: 'Add App'),
-        ],
-        onDestinationSelected: (int index) {
-          setState(() {
-            selectedIndex = index;
-          });
-        },
-        selectedIndex: selectedIndex,
-      ),
-    );
+    return WillPopScope(
+        child: Scaffold(
+          appBar: AppBar(title: const Text('Obtainium')),
+          body: pages.elementAt(selectedIndex),
+          bottomNavigationBar: NavigationBar(
+            destinations: const [
+              NavigationDestination(
+                  icon: Icon(Icons.settings), label: 'Settings'),
+              NavigationDestination(icon: Icon(Icons.apps), label: 'Apps'),
+              NavigationDestination(icon: Icon(Icons.add), label: 'Add App'),
+            ],
+            onDestinationSelected: (int index) {
+              HapticFeedback.lightImpact();
+              setState(() {
+                selectedIndex = index;
+              });
+            },
+            selectedIndex: selectedIndex,
+          ),
+        ),
+        onWillPop: () async {
+          if (selectedIndex != 1) {
+            setState(() {
+              selectedIndex = 1;
+            });
+            return false;
+          }
+          return true;
+        });
   }
 }

lib/pages/settings.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:obtainium/providers/apps_provider.dart';
 import 'package:obtainium/providers/settings_provider.dart';
 import 'package:provider/provider.dart';
@@ -118,6 +119,7 @@ class _SettingsPageState extends State<SettingsPage> {
                           onPressed: appsProvider.apps.isEmpty
                               ? null
                               : () {
+                                  HapticFeedback.lightImpact();
                                   appsProvider.exportApps().then((String path) {
                                     ScaffoldMessenger.of(context).showSnackBar(
                                       SnackBar(
@@ -128,6 +130,7 @@ class _SettingsPageState extends State<SettingsPage> {
                           child: const Text('Export Apps')),
                       ElevatedButton(
                           onPressed: () {
+                            HapticFeedback.lightImpact();
                             showDialog(
                                 context: context,
                                 builder: (BuildContext ctx) {
@@ -172,6 +175,13 @@ class _SettingsPageState extends State<SettingsPage> {
                                     actions: [
                                       TextButton(
                                           onPressed: () {
+                                            HapticFeedback.lightImpact();
+                                            Navigator.of(context).pop();
+                                          },
+                                          child: const Text('Cancel')),
+                                      TextButton(
+                                          onPressed: () {
+                                            HapticFeedback.heavyImpact();
                                             if (formKey.currentState!
                                                 .validate()) {
                                               appsProvider
@@ -198,11 +208,6 @@ class _SettingsPageState extends State<SettingsPage> {
                                             }
                                           },
                                           child: const Text('Import')),
-                                      TextButton(
-                                          onPressed: () {
-                                            Navigator.of(context).pop();
-                                          },
-                                          child: const Text('Cancel'))
                                     ],
                                   );
                                 });
@@ -223,6 +228,7 @@ class _SettingsPageState extends State<SettingsPage> {
                           }),
                         ),
                         onPressed: () {
+                          HapticFeedback.lightImpact();
                           launchUrlString(settingsProvider.sourceUrl,
                               mode: LaunchMode.externalApplication);
                         },

lib/providers/apps_provider.dart

@@ -6,6 +6,7 @@ import 'dart:convert';
 import 'dart:io';
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:obtainium/providers/notifications_provider.dart';
 import 'package:provider/provider.dart';
 import 'package:path_provider/path_provider.dart';
@@ -38,14 +39,26 @@ class AppsProvider with ChangeNotifier {
   late Stream<FGBGType> foregroundStream;
   late StreamSubscription<FGBGType> foregroundSubscription;
 
-  AppsProvider({bool bg = false}) {
+  AppsProvider(
+      {bool shouldLoadApps = false,
+      bool shouldCheckUpdatesAfterLoad = false,
+      bool shouldDeleteAPKs = false}) {
     // Subscribe to changes in the app foreground status
     foregroundStream = FGBGEvents.stream.asBroadcastStream();
     foregroundSubscription = foregroundStream.listen((event) async {
       isForeground = event == FGBGType.foreground;
       if (isForeground) await loadApps();
     });
-    loadApps();
+    if (shouldDeleteAPKs) {
+      deleteSavedAPKs();
+    }
+    if (shouldLoadApps) {
+      loadApps().then((_) {
+        if (shouldCheckUpdatesAfterLoad) {
+          checkUpdates();
+        }
+      });
+    }
   }
 
   Future<ApkFile> downloadApp(String apkUrl, String appId) async {
@@ -79,10 +92,14 @@ class AppsProvider with ChangeNotifier {
     return ApkFile(appId, downloadFile);
   }
 
+  bool areDownloadsRunning() => apps.values
+      .where((element) => element.downloadProgress != null)
+      .isNotEmpty;
+
   // Given an AppId, uses stored info about the app to download an APK (with user input if needed) and install it
   // Installs can only be done in the foreground, so a notification is sent to get the user's attention if needed
   // Returns upon successful download, regardless of installation result
-  Future<void> downloadAndInstallLatestApp(
+  Future<bool> downloadAndInstallLatestApp(
       List<String> appIds, BuildContext context) async {
     NotificationsProvider notificationsProvider =
         context.read<NotificationsProvider>();
@@ -91,37 +108,22 @@ class AppsProvider with ChangeNotifier {
       if (apps[id] == null) {
         throw 'App not found';
       }
-      String apkUrl = apps[id]!.app.apkUrls.last;
+      String? apkUrl = apps[id]!.app.apkUrls[apps[id]!.app.preferredApkIndex];
       if (apps[id]!.app.apkUrls.length > 1) {
-        await showDialog(
+        apkUrl = await showDialog(
             context: context,
             builder: (BuildContext ctx) {
-              return AlertDialog(
-                scrollable: true,
-                title: const Text('Pick an APK'),
-                content: Column(children: [
-                  Text(
-                      '${apps[id]!.app.name} has more than one package - pick one.'),
-                  ...apps[id]!.app.apkUrls.map((u) => ListTile(
-                      title: Text(Uri.parse(u).pathSegments.last),
-                      leading: Radio<String>(
-                          value: u,
-                          groupValue: apkUrl,
-                          onChanged: (String? val) {
-                            apkUrl = val!;
-                          })))
-                ]),
-                actions: [
-                  TextButton(
-                      onPressed: () {
-                        Navigator.of(context).pop();
-                      },
-                      child: const Text('Continue'))
-                ],
-              );
+              return APKPicker(app: apps[id]!.app, initVal: apkUrl);
             });
       }
-      appsToInstall.putIfAbsent(id, () => apkUrl);
+      if (apkUrl != null) {
+        int urlInd = apps[id]!.app.apkUrls.indexOf(apkUrl);
+        if (urlInd != apps[id]!.app.preferredApkIndex) {
+          apps[id]!.app.preferredApkIndex = urlInd;
+          await saveApp(apps[id]!.app);
+        }
+        appsToInstall.putIfAbsent(id, () => apkUrl!);
+      }
     }
 
     List<ApkFile> downloadedFiles = await Future.wait(appsToInstall.entries
@@ -131,6 +133,7 @@ class AppsProvider with ChangeNotifier {
       await notificationsProvider.notify(completeInstallationNotification,
           cancelExisting: true);
       await FGBGEvents.stream.first == FGBGType.foreground;
+      await notificationsProvider.cancel(completeInstallationNotification.id);
       // We need to wait for the App to come to the foreground to install it
       // Can't try to call install plugin in a background isolate (may not have worked anyways) because of:
       // https://github.com/flutter/flutter/issues/13937
@@ -144,6 +147,8 @@ class AppsProvider with ChangeNotifier {
       apps[f.appId]!.app.installedVersion = apps[f.appId]!.app.latestVersion;
       await saveApp(apps[f.appId]!.app);
     }
+
+    return downloadedFiles.isNotEmpty;
   }
 
   Future<Directory> getAppsDir() async {
@@ -209,9 +214,12 @@ class AppsProvider with ChangeNotifier {
 
   Future<App?> getUpdate(String appId) async {
     App? currentApp = apps[appId]!.app;
-    App newApp = await sourceProvider().getApp(currentApp.url);
+    App newApp = await SourceProvider().getApp(currentApp.url);
     if (newApp.latestVersion != currentApp.latestVersion) {
       newApp.installedVersion = currentApp.installedVersion;
+      if (currentApp.preferredApkIndex < newApp.apkUrls.length) {
+        newApp.preferredApkIndex = currentApp.preferredApkIndex;
+      }
       await saveApp(newApp);
       return newApp;
     }
@@ -281,3 +289,53 @@ class AppsProvider with ChangeNotifier {
     super.dispose();
   }
 }
+
+class APKPicker extends StatefulWidget {
+  const APKPicker({super.key, required this.app, this.initVal});
+
+  final App app;
+  final String? initVal;
+
+  @override
+  State<APKPicker> createState() => _APKPickerState();
+}
+
+class _APKPickerState extends State<APKPicker> {
+  String? apkUrl;
+
+  @override
+  Widget build(BuildContext context) {
+    apkUrl ??= widget.initVal;
+    return AlertDialog(
+      scrollable: true,
+      title: const Text('Pick an APK'),
+      content: Column(children: [
+        Text('${widget.app.name} has more than one package:'),
+        const SizedBox(height: 16),
+        ...widget.app.apkUrls.map((u) => RadioListTile<String>(
+            title: Text(Uri.parse(u).pathSegments.last),
+            value: u,
+            groupValue: apkUrl,
+            onChanged: (String? val) {
+              setState(() {
+                apkUrl = val;
+              });
+            }))
+      ]),
+      actions: [
+        TextButton(
+            onPressed: () {
+              HapticFeedback.lightImpact();
+              Navigator.of(context).pop(null);
+            },
+            child: const Text('Cancel')),
+        TextButton(
+            onPressed: () {
+              HapticFeedback.mediumImpact();
+              Navigator.of(context).pop(apkUrl);
+            },
+            child: const Text('Continue'))
+      ],
+    );
+  }
+}

lib/providers/source_provider.dart

@@ -29,8 +29,9 @@ class App {
   String? installedVersion;
   late String latestVersion;
   List<String> apkUrls = [];
+  late int preferredApkIndex;
   App(this.id, this.url, this.author, this.name, this.installedVersion,
-      this.latestVersion, this.apkUrls);
+      this.latestVersion, this.apkUrls, this.preferredApkIndex);
 
   @override
   String toString() {
@@ -38,15 +39,19 @@ class App {
   }
 
   factory App.fromJson(Map<String, dynamic> json) => App(
-      json['id'] as String,
-      json['url'] as String,
-      json['author'] as String,
-      json['name'] as String,
-      json['installedVersion'] == null
-          ? null
-          : json['installedVersion'] as String,
-      json['latestVersion'] as String,
-      List<String>.from(jsonDecode(json['apkUrls'])));
+        json['id'] as String,
+        json['url'] as String,
+        json['author'] as String,
+        json['name'] as String,
+        json['installedVersion'] == null
+            ? null
+            : json['installedVersion'] as String,
+        json['latestVersion'] as String,
+        List<String>.from(jsonDecode(json['apkUrls'])),
+        json['preferredApkIndex'] == null
+            ? 0
+            : json['preferredApkIndex'] as int,
+      );
 
   Map<String, dynamic> toJson() => {
         'id': id,
@@ -56,6 +61,7 @@ class App {
         'installedVersion': installedVersion,
         'latestVersion': latestVersion,
         'apkUrls': jsonEncode(apkUrls),
+        'preferredApkIndex': preferredApkIndex
       };
 }
 
@@ -77,7 +83,7 @@ List<String> getLinksFromParsedHTML(
         .toList();
 
 abstract class AppSource {
-  late String sourceId;
+  late String host;
   String standardizeURL(String url);
   Future<APKDetails> getLatestAPKDetails(String standardUrl);
   AppNames getAppNames(String standardUrl);
@@ -85,11 +91,11 @@ abstract class AppSource {
 
 class GitHub implements AppSource {
   @override
-  String sourceId = 'github';
+  late String host = 'github.com';
 
   @override
   String standardizeURL(String url) {
-    RegExp standardUrlRegEx = RegExp(r'^https?://github.com/[^/]*/[^/]*');
+    RegExp standardUrlRegEx = RegExp('^https?://$host/[^/]+/[^/]+');
     RegExpMatch? match = standardUrlRegEx.firstMatch(url.toLowerCase());
     if (match == null) {
       throw 'Not a valid URL';
@@ -99,7 +105,6 @@ class GitHub implements AppSource {
 
   @override
   Future<APKDetails> getLatestAPKDetails(String standardUrl) async {
-    // The GitHub RSS feed does not contain asset download details, so we use web scraping (avoid API due to rate limits)
     Response res = await get(Uri.parse('$standardUrl/releases/latest'));
     if (res.statusCode == 200) {
       var standardUri = Uri.parse(standardUrl);
@@ -144,11 +149,11 @@ class GitHub implements AppSource {
 
 class GitLab implements AppSource {
   @override
-  String sourceId = 'gitlab';
+  late String host = 'gitlab.com';
 
   @override
   String standardizeURL(String url) {
-    RegExp standardUrlRegEx = RegExp(r'^https?://gitlab.com/[^/]*/[^/]*');
+    RegExp standardUrlRegEx = RegExp('^https?://$host/[^/]+/[^/]+');
     RegExpMatch? match = standardUrlRegEx.firstMatch(url.toLowerCase());
     if (match == null) {
       throw 'Not a valid URL';
@@ -158,14 +163,13 @@ class GitLab implements AppSource {
 
   @override
   Future<APKDetails> getLatestAPKDetails(String standardUrl) async {
-    // GitLab provides an RSS feed with all the details we need
     Response res = await get(Uri.parse('$standardUrl/-/tags?format=atom'));
     if (res.statusCode == 200) {
       var standardUri = Uri.parse(standardUrl);
       var parsedHtml = parse(res.body);
       var entry = parsedHtml.querySelector('entry');
       var entryContent =
-          parse(parseFragment(entry!.querySelector('content')!.innerHtml).text);
+          parse(parseFragment(entry?.querySelector('content')!.innerHtml).text);
       var apkUrlList = getLinksFromParsedHTML(
           entryContent,
           RegExp(
@@ -176,7 +180,7 @@ class GitLab implements AppSource {
         throw 'No APK found';
       }
 
-      var entryId = entry.querySelector('id')?.innerHtml;
+      var entryId = entry?.querySelector('id')?.innerHtml;
       var version =
           entryId == null ? null : Uri.parse(entryId).pathSegments.last;
       if (version == null) {
@@ -195,15 +199,142 @@ class GitLab implements AppSource {
   }
 }
 
-class sourceProvider {
+class Signal implements AppSource {
+  @override
+  late String host = 'signal.org';
+
+  @override
+  String standardizeURL(String url) {
+    return 'https://$host';
+  }
+
+  @override
+  Future<APKDetails> getLatestAPKDetails(String standardUrl) async {
+    Response res =
+        await get(Uri.parse('https://updates.$host/android/latest.json'));
+    if (res.statusCode == 200) {
+      var json = jsonDecode(res.body);
+      String? apkUrl = json['url'];
+      if (apkUrl == null) {
+        throw 'No APK found';
+      }
+      String? version = json['versionName'];
+      if (version == null) {
+        throw 'Could not determine latest release version';
+      }
+      return APKDetails(version, [apkUrl]);
+    } else {
+      throw 'Unable to fetch release info';
+    }
+  }
+
+  @override
+  AppNames getAppNames(String standardUrl) => AppNames('Signal', 'Signal');
+}
+
+class FDroid implements AppSource {
+  @override
+  late String host = 'f-droid.org';
+
+  @override
+  String standardizeURL(String url) {
+    RegExp standardUrlRegEx = RegExp('^https?://$host/[^/]+/packages/[^/]+');
+    RegExpMatch? match = standardUrlRegEx.firstMatch(url.toLowerCase());
+    if (match == null) {
+      throw 'Not a valid URL';
+    }
+    return url.substring(0, match.end);
+  }
+
+  @override
+  Future<APKDetails> getLatestAPKDetails(String standardUrl) async {
+    Response res = await get(Uri.parse(standardUrl));
+    if (res.statusCode == 200) {
+      var latestReleaseDiv =
+          parse(res.body).querySelector('#latest.package-version');
+      var apkUrl = latestReleaseDiv
+          ?.querySelector('.package-version-download a')
+          ?.attributes['href'];
+      if (apkUrl == null) {
+        throw 'No APK found';
+      }
+      var version = latestReleaseDiv
+          ?.querySelector('.package-version-header b')
+          ?.innerHtml
+          .split(' ')
+          .last;
+      if (version == null) {
+        throw 'Could not determine latest release version';
+      }
+      return APKDetails(version, [apkUrl]);
+    } else {
+      throw 'Unable to fetch release info';
+    }
+  }
+
+  @override
+  AppNames getAppNames(String standardUrl) {
+    var name = Uri.parse(standardUrl).pathSegments.last;
+    return AppNames(name, name);
+  }
+}
+
+class Mullvad implements AppSource {
+  @override
+  late String host = 'mullvad.net';
+
+  @override
+  String standardizeURL(String url) {
+    RegExp standardUrlRegEx = RegExp('^https?://$host');
+    RegExpMatch? match = standardUrlRegEx.firstMatch(url.toLowerCase());
+    if (match == null) {
+      throw 'Not a valid URL';
+    }
+    return url.substring(0, match.end);
+  }
+
+  @override
+  Future<APKDetails> getLatestAPKDetails(String standardUrl) async {
+    Response res = await get(Uri.parse('$standardUrl/en/download/android'));
+    if (res.statusCode == 200) {
+      var version = parse(res.body)
+          .querySelector('p.subtitle.is-6')
+          ?.querySelector('a')
+          ?.attributes['href']
+          ?.split('/')
+          .last;
+      if (version == null) {
+        throw 'Could not determine the latest release version';
+      }
+      return APKDetails(
+          version, ['https://mullvad.net/download/app/apk/latest']);
+    } else {
+      throw 'Unable to fetch release info';
+    }
+  }
+
+  @override
+  AppNames getAppNames(String standardUrl) {
+    return AppNames('Mullvad-VPN', 'Mullvad-VPN');
+  }
+}
+
+class SourceProvider {
+  List<AppSource> sources = [GitHub(), GitLab(), FDroid(), Mullvad(), Signal()];
+
   // Add more source classes here so they are available via the service
   AppSource getSource(String url) {
-    if (url.toLowerCase().contains('://github.com')) {
-      return GitHub();
-    } else if (url.toLowerCase().contains('://gitlab.com')) {
-      return GitLab();
+    AppSource? source;
+    for (var s in sources) {
+      if (url.toLowerCase().contains('://${s.host}')) {
+        source = s;
+        break;
+      }
     }
-    throw 'URL does not match a known source';
+    if (source == null) {
+      throw 'URL does not match a known source';
+    }
+    return source;
   }
 
   Future<App> getApp(String url) async {
@@ -219,12 +350,15 @@ class sourceProvider {
     AppNames names = source.getAppNames(standardUrl);
     APKDetails apk = await source.getLatestAPKDetails(standardUrl);
     return App(
-        '${names.author.toLowerCase()}_${names.name.toLowerCase()}_${source.sourceId}',
+        '${names.author.toLowerCase()}_${names.name.toLowerCase()}_${source.host}',
         standardUrl,
         names.author[0].toUpperCase() + names.author.substring(1),
         names.name[0].toUpperCase() + names.name.substring(1),
         null,
         apk.version,
-        apk.apkUrls);
+        apk.apkUrls,
+        apk.apkUrls.length - 1);
   }
+
+  List<String> getSourceHosts() => sources.map((e) => e.host).toList();
 }

pubspec.yaml

@@ -17,7 +17,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 0.1.3+4 # When changing this, update the tag in main() accordingly
+version: 0.1.7+8 # When changing this, update the tag in main() accordingly
 
 environment:
   sdk: '>=2.19.0-79.0.dev <3.0.0'
@@ -66,9 +66,9 @@ dev_dependencies:
 
 flutter_icons:
   android: true
-  image_path: "assets/icon.png"
+  image_path: "assets/graphics/icon.png"
   adaptive_icon_background: "#FFFFFF"
-  adaptive_icon_foreground: "assets/icon.png"
+  adaptive_icon_foreground: "assets/graphics/icon.png"
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec