better background tasks

lib/main.dart

@@ -10,6 +10,7 @@ import 'package:disable_battery_optimization/disable_battery_optimization.dart';
 import 'package:flutter_background_service/flutter_background_service.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'dart:math';
+import 'package:workmanager/workmanager.dart';
 
 String formatMinutes(int minutes) {
   int hours = minutes ~/ 60;
@@ -29,6 +30,8 @@ String formatMinutes(int minutes) {
 
 @pragma('vm:entry-point')
 void callbackDispatcher() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
   Map content = await FileHandler.fileContent;
   int id = 15;
   for (String key in content.keys) {
@@ -62,26 +65,26 @@ void callbackDispatcher() async {
   }
 }
 
-@pragma('vm:entry-point')
-void onStart(ServiceInstance service) {
-  Timer.periodic(const Duration(minutes: 15), (timer) {
-    callbackDispatcher();
-  });
-}
+// @pragma('vm:entry-point')
+// void onStart(ServiceInstance service) {
+//   Timer.periodic(const Duration(minutes: 15), (timer) {
+//     callbackDispatcher();
+//   });
+// }
 
-Future<void> initService() async {
-  final service = FlutterBackgroundService();
-
-  await service.configure(
-      iosConfiguration: IosConfiguration(),
-      androidConfiguration: AndroidConfiguration(
-          onStart: onStart,
-          isForegroundMode: false,
-          autoStart: true,
-          autoStartOnBoot: true));
-
-  service.startService();
-}
+// Future<void> initService() async {
+//   final service = FlutterBackgroundService();
+//
+//   await service.configure(
+//       iosConfiguration: IosConfiguration(),
+//       androidConfiguration: AndroidConfiguration(
+//           onStart: onStart,
+//           isForegroundMode: false,
+//           autoStart: true,
+//           autoStartOnBoot: true));
+//
+//   service.startService();
+// }
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -95,7 +98,11 @@ void main() async {
     )
   ]);
 
-  await initService();
+
+  Workmanager().initialize(callbackDispatcher);
+  Workmanager().registerPeriodicTask("1", "notifyTask", frequency: Duration(minutes: 15));
+
+  // await initService();
   runApp(const MyApp());
 }