개발노트

E/MethodChannel#.com/flutter/local_notifications( 7674): Failed to handle method call
E/MethodChannel#.com/flutter/local_notifications( 7674): java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
E/MethodChannel#.com/flutter/local_notifications( 7674):  at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.setSmallIcon(FlutterLocalNotificationsPlugin.java:76)
E/MethodChannel#.com/flutter/local_notifications( 7674):  at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.createNotification(FlutterLocalNotificationsPlugin.java:88)

FlutterLocalNotificationsPlugin().show(
  notification.hashCode,
  notification.title,
  notification.body,
  const NotificationDetails(
    android: AndroidNotificationDetails(
      'high_importance_channel',
      'High Importance Notifications',
      importance: Importance.max,
      playSound: true,
      enableVibration: true,
      icon: "mipmap/app_icon", //당신의 mipmap 폴더에 있는 보여주려는 아이콘 파일명 입력. 확장자 필요없음
    ),
    iOS: DarwinNotificationDetails(
      presentAlert: true,
      presentBadge: true,
      presentSound: true,
      presentBanner: true,
    ),
  ),
);

flutter:
  assets:
    - assets/images/