Xamarin表格显示警报消失

Question

i'm developing an app in Xamarin Forms, but i've noticed a strange behavior, when i display an alert, in Android (version major than 4.2.2), if i press outside the alert modal, the alert disappear immediately. There is any way to prevent this? I want that the alert disappear only on user selection.

Many thanks

Answer 1

When a dialog is shown in Android, clicking just outside of it to cancel is pretty standard. To change this behavior you will need to create an interface in your PCL:

public interface ICustomAlert
{
  void ShowAlert(string message);
}

In your Android project create the implementation (something like this):

  [assembly: Xamarin.Forms.Dependency (typeof (AndroidCustomAlert))]   
  public class AndroidCustomAlert : ICustomAlert
    {
      void ShowAlert(string message)
      {
        var builder = new AlertDialog.Builder(Xamarin.Forms.Forms.Context);
        builder.SetMessage(message);
        builder.SetPositiveButton("OK", (sender, args) => { });
        builder.SetCancelable(false);
        builder.Show();
      }
    }

Notice the SetCancelable(false) . That's what makes it so the user can't click outside of the alert and make it disappear.

To use it, get ICustomAlert from the dependency service and call ShowAlert:

DependencyService.Get<ICustomAlert>().ShowAlert("Hello!");

Answer 2

Implement your own DisplayAlert with a PopupLayout.

OR

Make use of ACR User Dialogs Plugin for Xamarin by Allan Ritchie