为什么局部通知会产生异常

Question

我正在尝试使用此依赖项在android上发送带有flutter的通知:

"flutter_local_notifications: ^ 9.0.1"

但是当我点击"test&quot按钮时，它给了我这个错误。

有谁知道我怎么解决这个问题吗?

////////////////////////////////////////////////////////////////////////

在main.dart:

ElevatedButton(
onPressed: () => NotificationApi.showNotification(
title: 'Samira', body: 'Heyy theree !!!', payload: 'samira'),
child: Text("test"),

在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,
);
}

控制台错误:

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

您应该正确添加通知图标。它解决了我的问题。

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(),
);
}