Update alarm notification when app in foreground, background and terminate

lib/product/services/alarm_services.dart

@@ -0,0 +1,34 @@
+import 'dart:io';
+import 'package:alarm/alarm.dart';
+
+class AlarmServices {
+  Future<void> showAlarm(String title, String body) async {
+    final DateTime now = DateTime.now();
+    final AlarmSettings alarmSettings = AlarmSettings(
+      id: 42,
+      dateTime: now,
+      assetAudioPath: 'assets/sounds/warning_alarm.mp3',
+      loopAudio: true,
+      vibrate: true,
+      warningNotificationOnKill: Platform.isIOS,
+      androidFullScreenIntent: true,
+      allowAlarmOverlap: true,
+      volumeSettings: VolumeSettings.fade(
+        volume: 1.0,
+        fadeDuration: const Duration(seconds: 3),
+        volumeEnforced: true,
+      ),
+      notificationSettings: NotificationSettings(
+        title: title,
+        body: body,
+        stopButton: 'Dừng cảnh báo',
+        icon: 'ic_launcher',
+      ),
+    );
+    await Alarm.set(alarmSettings: alarmSettings);
+  }
+
+  void cancelAlarm({int id = 42}) async {
+    await Alarm.stop(id);
+  }
+}