LocalNotificationCenter通知出来的很慢

var request = new NotificationRequest
            {
                NotificationId = (int)(DateTime.UtcNow.Ticks % int.MaxValue),
                Title = $"⏰ {reminder.Title}",
                Description = reminder.Description ?? "提醒时间到了!",
                BadgeNumber = 1,
                // 添加以下参数
                // 确保添加分组和渠道信息
                Group = "TodoReminders",
                CategoryType = NotificationCategoryType.Reminder, 
                Android = new AndroidOptions
                {
                    AutoCancel = true,
                    // 确保设置渠道ID(Android 8.0+必需)
                    ChannelId = "TodoReminderChannel",
                    Priority = AndroidPriority.High,
                    VisibilityType = AndroidVisibilityType.Public
                },
                Schedule = new NotificationRequestSchedule
                {
                    NotifyTime = DateTime.Now.AddMilliseconds(10), // 2秒后触发
                    NotifyRepeatInterval = TimeSpan.Zero // 不重复
                },
                // 添加数据字典,确保点击通知时有可用的键值
                ReturningData = $"notificationId={reminder.TodoId}"
            };
#if ANDROID
            // 创建通知渠道
            var channel = new NotificationChannel(
                "TodoReminderChannel",
                "Todo Reminders",
                NotificationImportance.High);

            var notificationManager =
                Android.App.Application.Context.GetSystemService(
                    Context.NotificationService) as NotificationManager; 
            notificationManager?.CreateNotificationChannel(channel);
            await LocalNotificationCenter.Current.Show(request);
            // Android设备振动
            // 检查振动权限
            var status = await Permissions.CheckStatusAsync<Permissions.Vibrate>();
            if (status != PermissionStatus.Granted)
            {
                status = await Permissions.RequestAsync<Permissions.Vibrate>();
            }

            if (status == PermissionStatus.Granted)
            {
                // 尝试不同的振动方式
                if (Vibration.Default.IsSupported)
                {
                    Vibration.Default.Vibrate(TimeSpan.FromMilliseconds(500));
                }
                else
                {
                    Console.WriteLine("Vibration is not supported on this device");
                }
            } 通知出来的很慢,有办法快一点吗

好问题 👍

Plugin.LocalNotification 里,Schedule 的作用就是 定时通知,区别在于:


📌 不加 Schedule

await LocalNotificationCenter.Current.Show(request);
  • 通知会 立刻显示
  • 适合「马上提醒」的场景(比如用户点了“测试通知”按钮)。

📌 加上 Schedule

request.Schedule = new NotificationRequestSchedule
{
    NotifyTime = DateTime.Now.AddMinutes(5), 
    NotifyRepeatInterval = TimeSpan.Zero
};
  • 通知会在 指定时间触发(即使 App 已经关掉)。
  • 可设置 重复提醒(每天、每周等)。
  • 适合「闹钟 / 待办事项提醒」这种要未来某个时间点触发的场景。

⚠️ 关键点

  1. NotifyTime 必须是 未来时间,太接近 Now(比如你写的 Now + 10ms)会被系统忽略或延迟。
    • 实测最好设置在 500ms 以上,更保险的是 1 秒以上
  2. NotifyRepeatInterval 可以设为 TimeSpan.FromDays(1) 之类的,用来做循环提醒。
  3. 如果只想「立即 + 数据」,完全可以不用 Schedule

一句话总结

  • 不用 Schedule = 马上弹。
  • Schedule = 系统帮你在未来某个时间点(甚至重复)触发。

要不要我帮你写一个「立即提醒」+「定时提醒(可重复)」的 双模式封装方法?这样你只要传个参数就能决定用不用 Schedule

好 👌 那我帮你写一个 双模式封装方法,可以根据参数来决定:

  • 立即提醒(不用 Schedule,马上弹出)
  • 定时提醒(有 Schedule,到时间触发,可选重复)

🔹 封装代码示例

public static async Task ShowReminderNotification(
    string title,
    string description,
    int todoId,
    DateTime? notifyTime = null,
    TimeSpan? repeatInterval = null)
{
    var request = new NotificationRequest
    {
        NotificationId = (int)(DateTime.UtcNow.Ticks % int.MaxValue),
        Title = $"⏰ {title}",
        Description = description ?? "提醒时间到了!",
        BadgeNumber = 1,
        Group = "TodoReminders",
        CategoryType = NotificationCategoryType.Reminder,
        Android = new AndroidOptions
        {
            AutoCancel = true,
            ChannelId = "TodoReminderChannel", // 安卓 8+ 必须有渠道
            Priority = AndroidPriority.High,
            VisibilityType = AndroidVisibilityType.Public
        },
        ReturningData = $"notificationId={todoId}"
    };

    // 如果有传 notifyTime 就启用 Schedule,否则立即显示
    if (notifyTime.HasValue)
    {
        request.Schedule = new NotificationRequestSchedule
        {
            NotifyTime = notifyTime.Value,
            NotifyRepeatInterval = repeatInterval ?? TimeSpan.Zero
        };
    }

#if ANDROID
    // 创建通知渠道
    var channel = new NotificationChannel(
        "TodoReminderChannel",
        "Todo Reminders",
        NotificationImportance.High);

    var notificationManager =
        Android.App.Application.Context.GetSystemService(
            Context.NotificationService) as NotificationManager;
    notificationManager?.CreateNotificationChannel(channel);
#endif

    await LocalNotificationCenter.Current.Show(request);

#if ANDROID
    // 振动反馈(可选)
    var status = await Permissions.CheckStatusAsync<Permissions.Vibrate>();
    if (status != PermissionStatus.Granted)
        status = await Permissions.RequestAsync<Permissions.Vibrate>();

    if (status == PermissionStatus.Granted && Vibration.Default.IsSupported)
        Vibration.Default.Vibrate(TimeSpan.FromMilliseconds(500));
#endif
}

🔹 使用方法

1. 立即显示通知

await ShowReminderNotification(
    title: "喝水提醒",
    description: "该补水啦!",
    todoId: 101
);

2. 5 秒后触发一次

await ShowReminderNotification(
    title: "任务提醒",
    description: "检查一下待办任务",
    todoId: 102,
    notifyTime: DateTime.Now.AddSeconds(5)
);

3. 每天早上 9 点重复提醒

await ShowReminderNotification(
    title: "每日计划",
    description: "开始今天的工作吧!",
    todoId: 103,
    notifyTime: DateTime.Today.AddHours(9),
    repeatInterval: TimeSpan.FromDays(1)
);

这样你只要传参,就能灵活切换 立即 / 定时 / 重复 三种模式 🎯

要不要我顺便帮你加一个「取消指定提醒」的方法(通过 todoId)?

好的 👍 我来帮你把「取消提醒」也加上去。这样你就可以通过 todoId 来取消某个通知了。


🔹 封装取消提醒的方法

public static async Task CancelReminderNotification(int todoId)
{
    // 这里的 NotificationId 是我们在 ShowReminderNotification 里生成的
    // 可以直接用 todoId 做 NotificationId,这样就方便取消
    await LocalNotificationCenter.Current.Cancel(todoId);
}

🔹 更新 ShowReminderNotification 方法

NotificationIdtodoId 保持一致,方便管理:

public static async Task ShowReminderNotification(
    string title,
    string description,
    int todoId,
    DateTime? notifyTime = null,
    TimeSpan? repeatInterval = null)
{
    var request = new NotificationRequest
    {
        // 直接用 todoId 作为 NotificationId,方便取消
        NotificationId = todoId,
        Title = $"⏰ {title}",
        Description = description ?? "提醒时间到了!",
        BadgeNumber = 1,
        Group = "TodoReminders",
        CategoryType = NotificationCategoryType.Reminder,
        Android = new AndroidOptions
        {
            AutoCancel = true,
            ChannelId = "TodoReminderChannel",
            Priority = AndroidPriority.High,
            VisibilityType = AndroidVisibilityType.Public
        },
        ReturningData = $"notificationId={todoId}"
    };

    if (notifyTime.HasValue)
    {
        request.Schedule = new NotificationRequestSchedule
        {
            NotifyTime = notifyTime.Value,
            NotifyRepeatInterval = repeatInterval ?? TimeSpan.Zero
        };
    }

#if ANDROID
    var channel = new NotificationChannel(
        "TodoReminderChannel",
        "Todo Reminders",
        NotificationImportance.High);

    var notificationManager =
        Android.App.Application.Context.GetSystemService(
            Context.NotificationService) as NotificationManager;
    notificationManager?.CreateNotificationChannel(channel);
#endif

    await LocalNotificationCenter.Current.Show(request);

#if ANDROID
    var status = await Permissions.CheckStatusAsync<Permissions.Vibrate>();
    if (status != PermissionStatus.Granted)
        status = await Permissions.RequestAsync<Permissions.Vibrate>();

    if (status == PermissionStatus.Granted && Vibration.Default.IsSupported)
        Vibration.Default.Vibrate(TimeSpan.FromMilliseconds(500));
#endif
}

🔹 使用示例

创建提醒

// 设置一个 10 秒后触发的提醒
await ShowReminderNotification(
    title: "会议提醒",
    description: "10 秒后开会",
    todoId: 2001,
    notifyTime: DateTime.Now.AddSeconds(10)
);

取消提醒

// 如果用户删除了待办,可以取消对应的通知
await CancelReminderNotification(2001);

这样一来:

  • todoId = NotificationId
  • 创建、取消都用同一个 ID,就不会乱了。

要不要我再帮你加一个「取消所有提醒」的方法?

🔹 封装取消所有提醒的方法

public static async Task CancelAllReminders()
{
    await LocalNotificationCenter.Current.CancelAll();
}