How can I make my app send out notifications when it's loaded but not running in the foreground?

Question

I have an app that I use sometimes. I must have left it there in the background before I slept. When I woke up I saw this notification on my screen.

Does anyo

Answer 1

You can use Notifications to achieve this function. From document Local notifications in Xamarin.Forms,we will find:

Local notifications are alerts sent by applications installed on a mobile device. Local notifications are often used for features such as:

• List item
• Calendar events
• Reminders

Location-based triggers Each platform handles the creation, display, and consumption of local notifications differently.

You can defines a cross-platform API that the application can use to interact with notifications.

  public interface INotificationManager
{
    event EventHandler NotificationReceived;

    void Initialize();

    int ScheduleNotification(string title, string message);

    void ReceiveNotification(string title, string message);
}

For more details, you can check above document, and this link also contains a sample about Notifications.It should be helpful for you.

Of course, if you want your app send notification when app is in background, you can use background-tasks.

For more details,you can check:

https://xamarinhelp.com/xamarin-background-tasks/

https://docs.microsoft.com/zh-cn/xamarin/ios/app-fundamentals/backgrounding/

https://docs.microsoft.com/en-ie/xamarin/android/app-fundamentals/services/creating-a-service/