在 PCL 项目 xamarin 上添加通知

Question

I am trying to understand how notifications work on a pcl project. I followed this tutorial but it refers most on android applications, not so muck on a pcl project. Can i implement notifications from the portable project? First i could use a button that pops a local notification.

For now i am interested in the android implementation more than the ios.

Answer 1

There are plugins to display LocalNotification in XamarinForms PCL

For example LocalNotificationsPlugin

API Usage

Call CrossLocalNotifications.Current from any project or PCL to gain access to APIs.

Display a local notification immediately

CrossLocalNotifications.Current.Show("title", "body");

Display a local notification at a scheduled date/time

CrossLocalNotifications.Current.Show("title", "body", 101, DateTime.Now.AddSeconds(5));

Cancel a local notification

CrossLocalNotifications.Current.Cancel(101);

or

Toasts.Forms.Plugin

Usage

Use dependency service in order to resolve IToastNotificator.

var notificator = DependencyService.Get<IToastNotificator>();

var options = new NotificationOptions()
            {
                Title = "Title",
                Description = "Description"
            };

var result = await notificator.Notify(options);

The result that is returned is a NotificationResult with an Action inside with one of the following values.

[Flags]
public enum NotificationAction
{
    Timeout = 1, // Hides by itself
    Clicked = 2, // User clicked on notification
    Dismissed = 4, // User manually dismissed notification
    ApplicationHidden = 8, // Application went to background
    Failed = 16 // When failed to display the toast
}

If you want the Clicked NotificationAction you must set IsClickable = true in the NotificationOptions.

Another aritchie/notifications

Send a notification

await CrossNotifications.Current.Send("My Title", "My message for the notification");

Send a scheduled notification:

await CrossNotifications.Current.Send("Happy Birthday", "I sent this a long time ago", when = TimeSpan.FromDays(50));

Get a list of scheduled notifications

var list = await CrossNotifications.Current.GetScheduledNotifications();

Cancel a specific notification

var id = await CrossNotifications.Current.Send("Hi", "This is my scheduled notification", when = TimeSpan.FromDays(1));
await CrossNotifications.Current.Cancel(id);

Cancel all scheduled notifications and clear badge:

CrossNotifications.Current.CancelAll();

To set a badge:

Setting badges works on all platforms, though only select flavours of Android. A 3rd party library is used to accomplish this.

await CrossNotifications.Current.SetBadge(4);
await CrossNotifications.Current.GetBadge();

// 0 clears badge