使用“flutter_local_notifications”包时出现“无效通知（无有效小图标）”错误

Question

我想在 flutter 中显示一个简单的通知。这是我的源代码：

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

class MyScreen extends StatefulWidget {
  const MyScreen({Key? key}) : super(key: key);

  @override
  State<MyScreen> createState() => _MyScreenState();
}

class _MyScreenState extends State<MyScreen> {

  FlutterLocalNotificationsPlugin? flutterLocalNotificationsPlugin;
  var initializationSettings;

  @override
  void initState() {
    super.initState();
    flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
    initializePlatformSpecifics();
  }

  initializePlatformSpecifics() {
    var initializationSettingsAndroid = AndroidInitializationSettings('assets/logo128.ico');
    initializationSettings =
        InitializationSettings(android: initializationSettingsAndroid);
  }

  Future<void> showNotification() async {
    var androidChannelSpecifics = AndroidNotificationDetails(
      'CHANNEL_ID',
      'CHANNEL_NAME',
      //"CHANNEL_DESCRIPTION",
      importance: Importance.max,
      priority: Priority.high,
      playSound: true,
      timeoutAfter: 5000,
      styleInformation: DefaultStyleInformation(true, true),
    );
    var platformChannelSpecifics =
        NotificationDetails(android: androidChannelSpecifics);
    await flutterLocalNotificationsPlugin!.show(
      0, // Notification ID
      'Test Title', // Notification Title
      'Test Body', // Notification Body, set as null to remove the body
      platformChannelSpecifics,
      payload: 'New Payload', // Notification Payload
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Color.fromARGB(255, 239, 241, 249),
      body: GestureDetector(
        onTap: () {
          showNotification();
        },
        child: Text(
          "Show Notification!",
          style: TextStyle(fontSize: 40, backgroundColor: Colors.redAccent),
        ),
      ),
    );
  }
}

但是点击“显示通知！”后出现此错误：

发生异常。
平台异常（平台异常（错误， 无效通知（无有效小图标）： 通知（通道=CHANNEL_ID 快捷方式=null contentView=null 振动=空声音=空默认= 0x0 标志= 0x10 颜色= 0x00000000 vis=PRIVATE), null, java.lang.IllegalArgumentException: 无效 通知（无有效小图标）：通知(channel=CHANNEL_ID 快捷方式=空 contentView=空 振动=空 声音=空 默认=0x0 标志=0x10 颜色=0x00000000 vis=私人）

请帮助我。

我也使用了这些命令，但问题没有解决：

var initializationSettingsAndroid = AndroidInitializationSettings('app_icon');

var initializationSettingsAndroid = AndroidInitializationSettings('android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png');

var initializationSettingsAndroid = AndroidInitializationSettings('@mipmap/ic_launcher');

这是我的 vs 代码截图：

vs代码截图

Answer 1

问题是

FlutterLocalNotificationsPlugin

的初始化函数没有被调用。尝试这样的事情：

  FlutterLocalNotificationsPlugin? flutterLocalNotificationsPlugin;
  late final InitializationSettings initializationSettings;

  _initializeFlutterLocalNotifications() async {
    flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();

    const initializationSettingsAndroid = AndroidInitializationSettings('@mipmap/ic_launcher');

    await flutterLocalNotificationsPlugin?.initialize(
      const InitializationSettings(
        android: initializationSettingsAndroid,
      ),
    );
  }

  @override
  void initState() {
    super.initState();

    _initializeFlutterLocalNotifications();
  }

我记得有一个问题，因为我如何通过

defaultIcon

路径，并通过

'@mipmap/ic_launcher'

解决了问题。