Try using foreground tasks for reliability

lib/main.dart

@@ -9,16 +9,15 @@ import 'package:obtainium/providers/native_provider.dart';
 import 'package:obtainium/providers/notifications_provider.dart';
 import 'package:obtainium/providers/settings_provider.dart';
 import 'package:obtainium/providers/source_provider.dart';
-import 'package:permission_handler/permission_handler.dart';
 import 'package:provider/provider.dart';
 import 'package:dynamic_color/dynamic_color.dart';
 import 'package:device_info_plus/device_info_plus.dart';
-import 'package:background_fetch/background_fetch.dart';
 import 'package:easy_localization/easy_localization.dart';
 // ignore: implementation_imports
 import 'package:easy_localization/src/easy_localization_controller.dart';
 // ignore: implementation_imports
 import 'package:easy_localization/src/localization.dart';
+import 'package:flutter_foreground_task/flutter_foreground_task.dart';
 
 List<MapEntry<Locale, String>> supportedLocales = const [
   MapEntry(Locale('en'), 'English'),
@@ -86,16 +85,35 @@ Future<void> loadTranslations() async {
 }
 
 @pragma('vm:entry-point')
-void backgroundFetchHeadlessTask(HeadlessTask task) async {
-  String taskId = task.taskId;
-  bool isTimeout = task.timeout;
-  if (isTimeout) {
-    print('BG update task timed out.');
-    BackgroundFetch.finish(taskId);
-    return;
+void startCallback() {
+  FlutterForegroundTask.setTaskHandler(MyTaskHandler());
+}
+
+class MyTaskHandler extends TaskHandler {
+  static const String incrementCountCommand = 'incrementCount';
+
+  // Called when the task is started.
+  @override
+  Future<void> onStart(DateTime timestamp, TaskStarter starter) async {
+    print('onStart(starter: ${starter.name})');
+    bgUpdateCheck('bg_check', null);
   }
-  await bgUpdateCheck(taskId, null);
-  BackgroundFetch.finish(taskId);
+
+  // Called based on the eventAction set in ForegroundTaskOptions.
+  @override
+  void onRepeatEvent(DateTime timestamp) {
+    bgUpdateCheck('Foreground service bg_check', null);
+  }
+
+  // Called when the task is destroyed.
+  @override
+  Future<void> onDestroy(DateTime timestamp, bool isTimeout) async {
+    print('Foreground service onDestroy(isTimeout: $isTimeout)');
+  }
+
+  // Called when data is sent using `FlutterForegroundTask.sendDataToTask`.
+  @override
+  void onReceiveData(Object data) {}
 }
 
 void main() async {
@@ -119,6 +137,7 @@ void main() async {
   }
   final np = NotificationsProvider();
   await np.initialize();
+  FlutterForegroundTask.initCommunicationPort();
   runApp(
     MultiProvider(
       providers: [
@@ -136,7 +155,6 @@ void main() async {
       ),
     ),
   );
-  BackgroundFetch.registerHeadlessTask(backgroundFetchHeadlessTask);
 }
 
 class Obtainium extends StatefulWidget {
@@ -152,32 +170,72 @@ class _ObtainiumState extends State<Obtainium> {
   @override
   void initState() {
     super.initState();
-    initPlatformState();
+    // FlutterForegroundTask.addTaskDataCallback(onReceiveForegroundServiceData);
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      requestNonOptionalPermissions();
+      initForegroundService();
+    });
   }
 
-  Future<void> initPlatformState() async {
-    await BackgroundFetch.configure(
-      BackgroundFetchConfig(
-        minimumFetchInterval: 15,
-        stopOnTerminate: false,
-        startOnBoot: true,
-        enableHeadless: true,
-        requiresBatteryNotLow: false,
-        requiresCharging: false,
-        requiresStorageNotLow: false,
-        requiresDeviceIdle: false,
-        requiredNetworkType: NetworkType.ANY,
+  Future<void> requestNonOptionalPermissions() async {
+    final NotificationPermission notificationPermission =
+        await FlutterForegroundTask.checkNotificationPermission();
+    if (notificationPermission != NotificationPermission.granted) {
+      await FlutterForegroundTask.requestNotificationPermission();
+    }
+    if (!await FlutterForegroundTask.isIgnoringBatteryOptimizations) {
+      await FlutterForegroundTask.requestIgnoreBatteryOptimization();
+    }
+  }
+
+  void initForegroundService() {
+    FlutterForegroundTask.init(
+      androidNotificationOptions: AndroidNotificationOptions(
+        channelId: 'bg_update',
+        channelName: tr('placeholder'),
+        channelDescription: tr('placeholder'),
+        onlyAlertOnce: true,
+      ),
+      iosNotificationOptions: const IOSNotificationOptions(
+        showNotification: false,
+        playSound: false,
+      ),
+      foregroundTaskOptions: ForegroundTaskOptions(
+        eventAction: ForegroundTaskEventAction.repeat(900000),
+        autoRunOnBoot: true,
+        autoRunOnMyPackageReplaced: true,
+        allowWakeLock: true,
+        allowWifiLock: true,
       ),
-      (String taskId) async {
-        await bgUpdateCheck(taskId, null);
-        BackgroundFetch.finish(taskId);
-      },
-      (String taskId) async {
-        context.read<LogsProvider>().add('BG update task timed out.');
-        BackgroundFetch.finish(taskId);
-      },
     );
-    if (!mounted) return;
+  }
+
+  Future<ServiceRequestResult> startForegroundService() async {
+    if (await FlutterForegroundTask.isRunningService) {
+      return FlutterForegroundTask.restartService();
+    } else {
+      return FlutterForegroundTask.startService(
+        serviceTypes: [ForegroundServiceTypes.specialUse],
+        serviceId: 666,
+        notificationTitle: tr('placeholder'),
+        notificationText: tr('placeholder'),
+        notificationIcon: NotificationIcon(
+          metaDataName: 'dev.imranr.obtainium.service.NOTIFICATION_ICON',
+        ),
+        callback: startCallback,
+      );
+    }
+  }
+
+  // void onReceiveForegroundServiceData(Object data) {
+  //   print('onReceiveTaskData: $data');
+  // }
+
+  @override
+  void dispose() {
+    // Remove a callback to receive data sent from the TaskHandler.
+    // FlutterForegroundTask.removeTaskDataCallback(onReceiveForegroundServiceData);
+    super.dispose();
   }
 
   @override
@@ -186,15 +244,14 @@ class _ObtainiumState extends State<Obtainium> {
     AppsProvider appsProvider = context.read<AppsProvider>();
     LogsProvider logs = context.read<LogsProvider>();
     NotificationsProvider notifs = context.read<NotificationsProvider>();
-
+    startForegroundService();
     if (settingsProvider.prefs == null) {
       settingsProvider.initializeSettings();
     } else {
       bool isFirstRun = settingsProvider.checkAndFlipFirstRun();
       if (isFirstRun) {
         logs.add('This is the first ever run of Obtainium.');
-        // If this is the first run, ask for notification permissions and add Obtainium to the Apps list
-        Permission.notification.request();
+        // If this is the first run, add Obtainium to the Apps list
         if (!fdroid) {
           getInstalledInfo(obtainiumId)
               .then((value) {
@@ -236,68 +293,71 @@ class _ObtainiumState extends State<Obtainium> {
       notifs.checkLaunchByNotif();
     });
 
-    return DynamicColorBuilder(
-      builder: (ColorScheme? lightDynamic, ColorScheme? darkDynamic) {
-        // Decide on a colour/brightness scheme based on OS and user settings
-        ColorScheme lightColorScheme;
-        ColorScheme darkColorScheme;
-        if (lightDynamic != null &&
-            darkDynamic != null &&
-            settingsProvider.useMaterialYou) {
-          lightColorScheme = lightDynamic.harmonized();
-          darkColorScheme = darkDynamic.harmonized();
-        } else {
-          lightColorScheme = ColorScheme.fromSeed(
-            seedColor: settingsProvider.themeColor,
+    return WithForegroundTask(
+      child: DynamicColorBuilder(
+        builder: (ColorScheme? lightDynamic, ColorScheme? darkDynamic) {
+          // Decide on a colour/brightness scheme based on OS and user settings
+          ColorScheme lightColorScheme;
+          ColorScheme darkColorScheme;
+          if (lightDynamic != null &&
+              darkDynamic != null &&
+              settingsProvider.useMaterialYou) {
+            lightColorScheme = lightDynamic.harmonized();
+            darkColorScheme = darkDynamic.harmonized();
+          } else {
+            lightColorScheme = ColorScheme.fromSeed(
+              seedColor: settingsProvider.themeColor,
+            );
+            darkColorScheme = ColorScheme.fromSeed(
+              seedColor: settingsProvider.themeColor,
+              brightness: Brightness.dark,
+            );
+          }
+
+          // set the background and surface colors to pure black in the amoled theme
+          if (settingsProvider.useBlackTheme) {
+            darkColorScheme = darkColorScheme
+                .copyWith(surface: Colors.black)
+                .harmonized();
+          }
+
+          if (settingsProvider.useSystemFont) NativeFeatures.loadSystemFont();
+
+          return MaterialApp(
+            title: 'Obtainium',
+            localizationsDelegates: context.localizationDelegates,
+            supportedLocales: context.supportedLocales,
+            locale: context.locale,
+            navigatorKey: globalNavigatorKey,
+            debugShowCheckedModeBanner: false,
+            theme: ThemeData(
+              useMaterial3: true,
+              colorScheme: settingsProvider.theme == ThemeSettings.dark
+                  ? darkColorScheme
+                  : lightColorScheme,
+              fontFamily: settingsProvider.useSystemFont
+                  ? 'SystemFont'
+                  : 'Montserrat',
+            ),
+            darkTheme: ThemeData(
+              useMaterial3: true,
+              colorScheme: settingsProvider.theme == ThemeSettings.light
+                  ? lightColorScheme
+                  : darkColorScheme,
+              fontFamily: settingsProvider.useSystemFont
+                  ? 'SystemFont'
+                  : 'Montserrat',
+            ),
+            home: Shortcuts(
+              shortcuts: <LogicalKeySet, Intent>{
+                LogicalKeySet(LogicalKeyboardKey.select):
+                    const ActivateIntent(),
+              },
+              child: const HomePage(),
+            ),
           );
-          darkColorScheme = ColorScheme.fromSeed(
-            seedColor: settingsProvider.themeColor,
-            brightness: Brightness.dark,
-          );
-        }
-
-        // set the background and surface colors to pure black in the amoled theme
-        if (settingsProvider.useBlackTheme) {
-          darkColorScheme = darkColorScheme
-              .copyWith(surface: Colors.black)
-              .harmonized();
-        }
-
-        if (settingsProvider.useSystemFont) NativeFeatures.loadSystemFont();
-
-        return MaterialApp(
-          title: 'Obtainium',
-          localizationsDelegates: context.localizationDelegates,
-          supportedLocales: context.supportedLocales,
-          locale: context.locale,
-          navigatorKey: globalNavigatorKey,
-          debugShowCheckedModeBanner: false,
-          theme: ThemeData(
-            useMaterial3: true,
-            colorScheme: settingsProvider.theme == ThemeSettings.dark
-                ? darkColorScheme
-                : lightColorScheme,
-            fontFamily: settingsProvider.useSystemFont
-                ? 'SystemFont'
-                : 'Montserrat',
-          ),
-          darkTheme: ThemeData(
-            useMaterial3: true,
-            colorScheme: settingsProvider.theme == ThemeSettings.light
-                ? lightColorScheme
-                : darkColorScheme,
-            fontFamily: settingsProvider.useSystemFont
-                ? 'SystemFont'
-                : 'Montserrat',
-          ),
-          home: Shortcuts(
-            shortcuts: <LogicalKeySet, Intent>{
-              LogicalKeySet(LogicalKeyboardKey.select): const ActivateIntent(),
-            },
-            child: const HomePage(),
-          ),
-        );
-      },
+        },
+      ),
     );
   }
 }