Why flutter local notifications give exceptions - flutter

Question

I'm trying to send a notification with flutter on android using this dependency:
"flutter_local_notifications: ^9.0.1"
But it gives me this error when I click the button "test".
Anyone has an idea how can I solve it?
////////////////////////////////////////////////////////////////////////
In main.dart:
ElevatedButton(
onPressed: () => NotificationApi.showNotification(
title: 'Samira', body: 'Heyy theree !!!', payload: 'samira'),
child: Text("test"),
In notification.dart:
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
class NotificationApi {
static final _notifications = FlutterLocalNotificationsPlugin();
static Future _notificationDetails() async {
return const NotificationDetails(
android: AndroidNotificationDetails(
'channel id',
'channel name',
channelDescription: 'channel description',
importance: Importance.max,
),
//iOS: IOSNotificationDetails(),
);
}
static Future showNotification({
int id = 0,
String? title,
String? body,
String? payload,
}) async =>
_notifications.show(
id,
title,
body,
await _notificationDetails(),
payload: payload,
);
}
The error in my console:
Performing hot reload...
Syncing files to device Android SDK built for x86...
Reloaded 1 of 1023 libraries in 426ms.
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): Failed to handle method call
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): 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(15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.setSmallIcon(FlutterLocalNotificationsPlugin.java:238)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.createNotification(FlutterLocalNotificationsPlugin.java:180)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.showNotification(FlutterLocalNotificationsPlugin.java:793)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.show(FlutterLocalNotificationsPlugin.java:1056)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.onMethodCall(FlutterLocalNotificationsPlugin.java:949)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:84)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:872)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at android.os.MessageQueue.next(MessageQueue.java:323)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at android.os.Looper.loop(Looper.java:136)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at android.app.ActivityThread.main(ActivityThread.java:6077)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
E/MethodChannel#dexterous.com/flutter/local_notifications(15565): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
E/flutter (15565): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] 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 (15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.setSmallIcon(FlutterLocalNotificationsPlugin.java:238)
E/flutter (15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.createNotification(FlutterLocalNotificationsPlugin.java:180)
E/flutter (15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.showNotification(FlutterLocalNotificationsPlugin.java:793)
E/flutter (15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.show(FlutterLocalNotificationsPlugin.java:1056)
E/flutter (15565): at com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin.onMethodCall(FlutterLocalNotificationsPlugin.java:949)
E/flutter (15565): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
E/flutter (15565): at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:84)
E/flutter (15565): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:872)
E/flutter (15565): at android.os.MessageQueue.nativePollOnce(Native Method)
E/flutter (15565): at android.os.MessageQueue.next(MessageQueue.java:323)
E/flutter (15565): at android.os.Looper.loop(Looper.java:136)
E/flutter (15565): at android.app.ActivityThread.main(ActivityThread.java:6077)
E/flutter (15565): at java.lang.reflect.Method.invoke(Native Method)
E/flutter (15565): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
E/flutter (15565): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
E/flutter (15565): )
E/flutter (15565): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:607:7)
E/flutter (15565): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:167:18)
E/flutter (15565): <asynchronous suspension>
E/flutter (15565): #2 FlutterLocalNotificationsPlugin.show (package:flutter_local_notifications/src/flutter_local_notifications_plugin.dart:194:7)
E/flutter (15565): <asynchronous suspension>
E/flutter (15565):

Answer 1

You should add the notification icon properly. It solved my issue.
static Future _notificationDetails() async {
return const NotificationDetails(
android: AndroidNotificationDetails(
'channel id',
'channel name',
channelDescription: 'channel description',
importance: Importance.max,
icon: "ic_notification", //<-- Add this parameter
),
//iOS: IOSNotificationDetails(),
);
}