플러터 로컬 푸시 아이콘 질문있습니다.

import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:permission_handler/permission_handler.dart';

class FlutterLocalNotification {
  FlutterLocalNotification._();

   static FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

   static init() async {
    AndroidInitializationSettings androidInitializationSettings =
        const AndroidInitializationSettings('mipmap/ic_launcher');


    InitializationSettings initializationSettings = InitializationSettings(
        android: androidInitializationSettings);
    await flutterLocalNotificationsPlugin.initialize(initializationSettings);
  }


  static Future<void> showNotification() async {
    const AndroidNotificationDetails androidNotificationDetails =
        AndroidNotificationDetails('channel id', 'channel name',
            channelDescription: 'channel description',
            importance: Importance.max,
            priority: Priority.max,
            showWhen: false);

    const NotificationDetails notificationDetails = NotificationDetails(
      android: androidNotificationDetails,
    );
    await flutterLocalNotificationsPlugin.show(
        0, 'test title', 'test body', notificationDetails);

    //await flutterLocalNotificationsPlugin.cancel(0); 아이디가 0인 알람 삭제
  }


  static Future<PermissionStatus> requestNotificationPermissions() async {
    final status = await Permission.notification.request();
    return status;
  }


}

다른 사람들 보면 아이콘도 같이 나오는데 저는 아이콘이 나오지 않아서 이렇게 질문드려요 어디가 이상한지 모르겠습니다.