Can't get the notification

[Nabeel-Shehzad]

Describe the bug
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): Failed to handle method call
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.setSmallIcon(FlutterLocalNotificationsPlugin.java:463)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.createNotification(FlutterLocalNotificationsPlugin.java:364)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.showNotification(FlutterLocalNotificationsPlugin.java:1248)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.show(FlutterLocalNotificationsPlugin.java:1588)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.onMethodCall(FlutterLocalNotificationsPlugin.java:1413)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at android.os.Handler.handleCallback(Handler.java:958)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at android.os.Handler.dispatchMessage(Handler.java:99)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at android.os.Looper.loopOnce(Looper.java:205)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at android.os.Looper.loop(Looper.java:294)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at android.app.ActivityThread.main(ActivityThread.java:8177)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
E/MethodChannel#dexterous.com/flutter/local_notifications(16232): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)
E/flutter (16232): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(error, Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference, null, java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
E/flutter (16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.setSmallIcon(FlutterLocalNotificationsPlugin.java:463)
E/flutter (16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.createNotification(FlutterLocalNotificationsPlugin.java:364)
E/flutter (16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.showNotification(FlutterLocalNotificationsPlugin.java:1248)
E/flutter (16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.show(FlutterLocalNotificationsPlugin.java:1588)
E/flutter (16232): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.onMethodCall(FlutterLocalNotificationsPlugin.java:1413)
E/flutter (16232): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/flutter (16232): at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/flutter (16232): at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/flutter (16232): at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/flutter (16232): at android.os.Handler.handleCallback(Handler.java:958)
E/flutter (16232): at android.os.Handler.dispatchMessage(Handler.java:99)
E/flutter (16232): at android.os.Looper.loopOnce(Looper.java:205)
E/flutter (16232): at android.os.Looper.loop(Looper.java:294)
E/flutter (16232): at android.app.ActivityThread.main(ActivityThread.java:8177)
E/flutter (16232): at java.lang.reflect.Method.invoke(Native Method)
E/flutter (16232): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
E/flutter (16232): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:971)
E/flutter (16232): )
E/flutter (16232): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
E/flutter (16232): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:334:18)
E/flutter (16232):
E/flutter (16232): #2 FlutterLocalNotificationsPlugin.show (package:flutter_local_notifications/src/flutter_local_notifications_plugin.dart:240:7)
E/flutter (16232):

To Reproduce

1. Go to firebase cloud messaging
2. Click on send test message

Sample code to reproduce the problem
import 'dart:math';

import 'package:app_settings/app_settings.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

class NotificationServices {
FirebaseMessaging messaging = FirebaseMessaging.instance;
final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();

void requestNotificationPermission() async {
NotificationSettings settings = await messaging.requestPermission(
alert: true,
announcement: false,
badge: true,
carPlay: false,
criticalAlert: false,
provisional: false,
sound: true,
);
if (settings.authorizationStatus == AuthorizationStatus.authorized) {
print('User granted permission');
} else if (settings.authorizationStatus ==
AuthorizationStatus.provisional) {
print('User granted provisional permission');
} else {
AppSettings.openAppSettings(
type: AppSettingsType.notification,
);
}
}

void initLocalNotifications(
BuildContext context, RemoteMessage message) async {
var androidInit = AndroidInitializationSettings('@drawable/ic_launcher');
var iosInit = DarwinInitializationSettings();

var initSettings = InitializationSettings(
  android: androidInit,
  iOS: iosInit,
);

await _flutterLocalNotificationsPlugin.initialize(initSettings,
    onDidReceiveNotificationResponse: (payload) {});

}

void firebaseInit() {
FirebaseMessaging.onMessage.listen((message) {
showNotification(message);
});
}

Future showNotification(RemoteMessage message) async {
AndroidNotificationChannel channel = AndroidNotificationChannel(
Random.secure().nextInt(1000).toString(),
'High Importance Notifications',
description: 'This channel is used for important notifications',
importance: Importance.max,
playSound: true,
enableVibration: true,
);
var androidDetails = AndroidNotificationDetails(
channel.id,
channel.name,
channelDescription: channel.description,
importance: Importance.max,
playSound: true,
enableVibration: true,
ticker: 'ticker',
);

DarwinNotificationDetails iosDetails = DarwinNotificationDetails(
  presentAlert: true,
  presentBadge: true,
  presentSound: true,
);

var platformChannelSpecifics = NotificationDetails(
  android: androidDetails,
  iOS: iosDetails,
);

Future.delayed(Duration.zero, () {
  _flutterLocalNotificationsPlugin.show(
    0,
    message.notification!.title.toString(),
    message.notification!.body.toString(),
    platformChannelSpecifics,
  );
});

}

Future<String?> getDeviceToken() async {
return await messaging.getToken();
}

//if token refresh
void onTokenRefresh() async {
messaging.onTokenRefresh.listen((event) {
event.toString();
});
}
}

[Nabeel-Shehzad]

added
icon: '@drawable/ic_launcher',
in AndroidNotificationDetails