Flutter Firebase foreground push notification not showing but background is working

It's been few days since I've been trying to solve this problem. I have implemented firebase messaging for push notification, as a result, I am able to receive notification when the app is in background, but not able to receive it when the app is in foreground. I tried every solution possible or on stackoverflow/github but nothing worked so far. The following are the sources which I tried:

stackoverflow solution 1

stackoverflow solution 2

Current code =>

NotificationService.dart:

class NotificationService {
  static final FlutterLocalNotificationsPlugin
      _flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

  static Future initialize() async {
    final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
        FlutterLocalNotificationsPlugin();

    AndroidInitializationSettings androidInitializationSettings =
        AndroidInitializationSettings('@mipmap/ic_launcher');

    InitializationSettings initializationSettings =
        InitializationSettings(android: androidInitializationSettings);

    await flutterLocalNotificationsPlugin.initialize(
      initializationSettings,
      // onSelectNotification: doSomething(),
    );
  }

  static Future showNotification(RemoteMessage message) async {
    AndroidNotificationDetails androidDetails = AndroidNotificationDetails(
      "default_notification_channel_id",
      "channel",
      enableLights: true,
      enableVibration: true,
      priority: Priority.high,
      importance: Importance.max,
      largeIcon: DrawableResourceAndroidBitmap("ic_launcher"),
      styleInformation: MediaStyleInformation(
        htmlFormatContent: true,
        htmlFormatTitle: true,
      ),
      playSound: true,
    );

    await _flutterLocalNotificationsPlugin.show(
        message.data.hashCode,
        message.data['title'],
        message.data['body'],
        NotificationDetails(
          android: androidDetails,
        ));
  }
}

main.dart:

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  print('Handling a background message ${message.messageId}');
  print('Notification Message: ${message.data}');
  NotificationService.showNotification(message);
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
  runApp(
    MyApp(),
  );
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  @override
  void initState() {
    super.initState();
    NotificationService.initialize();
    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      NotificationService.showNotification(message);
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(...)

One more point to add, when the app is in background (the case where I can receive notification), I get the output of the first 2 print statements i.e. message.messageId and message.data:

I/flutter ( 3363): Handling a background message 0:1637822186109880%5dd28a92f9fd7ecd
I/flutter ( 3363): Notification Message: {body: Price is at Bull! Buy Now!, title: Hello Traders!}

But when the app is in foreground (the case where I do not receive notification), I get the following output: D/FLTFireMsgReceiver( 3363): broadcast received for message

It would really help if someone could help me out, It's been days debugging, finding solution. Thank you!

AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.trading_app">

  <uses-permission android:name="android.permission.VIBRATE"/>
  <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
  <uses-permission android:name="android.permission.INTERNET"/>

   <application
        android:label="TradingApp"
        android:icon="@mipmap/ic_launcher">

        <meta-data
            android:name="com.google.firebase.messaging.default_notification_icon"
            android:resource="@mipmap/ic_launcher" />

        <meta-data         
            android:name="com.google.firebase.messaging.default_notification_channel_id"                 
            android:value="@string/default_notification_channel_id" />

        <receiver android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationBootReceiver">
        <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED"></action>
        </intent-filter>
        </receiver>
        <receiver android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationReceiver" />

        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">

            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />

            <meta-data
              android:name="io.flutter.embedding.android.SplashScreenDrawable"
              android:resource="@drawable/launch_background"
              />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
            <!-- <meta-data
            android:name="com.google.firebase.messaging.default_notification_channel_id"
            android:value="high_importance_channel" /> -->
    </application>
</manifest>