Switched to WorkManager for reliability (#608)

lib/main.dart

@@ -12,7 +12,7 @@ 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:android_alarm_manager_plus/android_alarm_manager_plus.dart';
+import 'package:workmanager/workmanager.dart';
 import 'package:easy_localization/easy_localization.dart';
 // ignore: implementation_imports
 import 'package:easy_localization/src/easy_localization_controller.dart';
@@ -23,7 +23,7 @@ const String currentVersion = '0.14.31';
 const String currentReleaseTag =
     'v$currentVersion-beta'; // KEEP THIS IN SYNC WITH GITHUB RELEASES
 
-const int bgUpdateCheckAlarmId = 666;
+const String bgUpdateTaskId = 'bgUpdate';
 
 List<MapEntry<Locale, String>> supportedLocales = const [
   MapEntry(Locale('en'), 'English'),
@@ -71,6 +71,17 @@ Future<void> loadTranslations() async {
       fallbackTranslations: controller.fallbackTranslations);
 }
 
+@pragma('vm:entry-point')
+void bgTaskDispatcher() {
+  Workmanager().executeTask((taskId, params) {
+    if (taskId == bgUpdateTaskId) {
+      return bgUpdateTask(taskId, params);
+    } else {
+      return Future.value(true);
+    }
+  });
+}
+
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   try {
@@ -88,7 +99,7 @@ void main() async {
     );
     SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);
   }
-  await AndroidAlarmManager.initialize();
+  await Workmanager().initialize(bgTaskDispatcher);
   runApp(MultiProvider(
     providers: [
       ChangeNotifierProvider(create: (context) => AppsProvider()),
@@ -158,7 +169,7 @@ class _ObtainiumState extends State<Obtainium> {
       var actualUpdateInterval = settingsProvider.updateInterval;
       if (existingUpdateInterval != actualUpdateInterval) {
         if (actualUpdateInterval == 0) {
-          AndroidAlarmManager.cancel(bgUpdateCheckAlarmId);
+          Workmanager().cancelByUniqueName(bgUpdateTaskId);
         } else {
           var settingChanged = existingUpdateInterval != -1;
           var lastCheckWasTooLongAgo = actualUpdateInterval != 0 &&
@@ -168,12 +179,10 @@ class _ObtainiumState extends State<Obtainium> {
           if (settingChanged || lastCheckWasTooLongAgo) {
             logs.add(
                 'Update interval was set to ${actualUpdateInterval.toString()} (reason: ${settingChanged ? 'setting changed' : 'last check was ${settingsProvider.lastBGCheckTime.toLocal().toString()}'}).');
-            AndroidAlarmManager.periodic(
-                Duration(minutes: actualUpdateInterval),
-                bgUpdateCheckAlarmId,
-                bgUpdateCheck,
-                rescheduleOnReboot: true,
-                wakeup: true);
+            Workmanager().registerPeriodicTask(
+                bgUpdateTaskId, "BG Update Main Loop",
+                initialDelay: Duration(minutes: actualUpdateInterval),
+                existingWorkPolicy: ExistingWorkPolicy.replace);
           }
         }
         existingUpdateInterval = actualUpdateInterval;