dismissing with the left swipe gesture on android does not close the modal dialog (HasBackdrop is true)

[softlion]

Dismissing with the left swipe gesture on android does not close the dialog (HasBackdrop is set to true).

Instead it triggers a back on the page displayed behind the dialog, which is not expected.

On normal content page, you can ovveride OnBackButtonPressed like this:

        protected override bool OnBackButtonPressed()

But that is unavailable on BottomSheet because it's a contentview not a contentpage.

Note that using the hardware back button on older Android versions also triggers OnBackButtonPressed().

[softlion]

I worked around by creating a dummy transparent page on android and intercept the back button there.

I implemtented something better than that, but you get the idea:

#if ANDROID
        var page = new DummyPage();
        page.OnBackButtonPressedEvent += (_,_) => {
             await popup.DismissAsync();
        };

        await navigation.PushModalAsync(page, false);
        await popup.ShowAsync(page.Window!);

//I'm awaiting a TaskCompletionSource object here. to detect when the popup is closed by any mean.
...
        //Time to close the dummy page too
        await navigation.PopModalAsync(false);
...


public class DummyPage : ContentPage
{
   public event EventHandler<EventArgs> OnBackButtonPressedEvent;

     public DummyPage()
    {
        BackgroundColor = Colors.Transparent;
    }
    
    /// <summary>
    /// For android back button
    /// </summary>
    protected override bool OnBackButtonPressed()
    {
        OnBackButtonPressedEvent?.Invoke(this, EventArgs.Empty);
        return true;
    }
}
#endif