在flutter中显示通知的最简单方法？

dependencies:
  flutter_local_notifications: ^5.0.0

import 'package:flutter_local_notifications/flutter_local_notifications.dart';

// 创建一个FlutterLocalNotificationsPlugin实例
FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
    FlutterLocalNotificationsPlugin();

// 在初始化方法中配置插件
void initializeNotifications() {
  var initializationSettingsAndroid =
      AndroidInitializationSettings('@mipmap/ic_launcher');
  var initializationSettingsIOS = IOSInitializationSettings();
  var initializationSettings = InitializationSettings(
      android: initializationSettingsAndroid, iOS: initializationSettingsIOS);
  flutterLocalNotificationsPlugin.initialize(initializationSettings);
}

// 显示通知的方法
void showNotification() async {
  var androidPlatformChannelSpecifics = AndroidNotificationDetails(
      'channel_id', 'channel_name', 'channel_description',
      importance: Importance.max, priority: Priority.high);
  var iOSPlatformChannelSpecifics = IOSNotificationDetails();
  var platformChannelSpecifics = NotificationDetails(
      android: androidPlatformChannelSpecifics,
      iOS: iOSPlatformChannelSpecifics);

  await flutterLocalNotificationsPlugin.show(
      0, '通知标题', '通知内容', platformChannelSpecifics,
      payload: 'notification_payload');
}

<uses-permission android:name="android.permission.VIBRATE" />

<application ...>
    <meta-data
        android:name="com.google.firebase.messaging.default_notification_channel_id"
        android:value="channel_id" />
</application>