[HELP] Android Tablet, resizing App calls CreateWindow, losing Navigation History and everything

[bnSonic]

Since MAUI we should use the App.xaml.cs

protected override Window CreateWindow(IActivationState activationState)

instead of setting MainPage

Now I have a problem on Android Tablets.
I have tested on a Samsung Tablet in Dex-Mode (this Desktop Mode)

When the user resizes the App-Window it happens, that the CreateWindow is called (not every time but very very often)
That's a problem (currently) because in the CreateWindow I expected the App to run into on the first start. So I create a Blank Page here … (when app starts fresh, the app.xaml.cs is calling an automated login on a first-welcome screen with a login later … all with doing a navigation or resetting the Windows[0].Page after a Login/Connection finished etc.)

And of course I don't want the App to completely start from scratch only because the user tries to resize the window ;)

I can see, that when the 'CreateWindow' is called because of a resize-action, the activationState-Parameter is set and filled with stuff. Maybe something with that could help?

I've already tried to save my current Window[0] and reuse it like:

private Page _myCurrentRoot;
...

protected override Window CreateWindow(IActivationState activationState)
{
 ...
 var window = new Window(_myCurrentRoot);
}

But then I got a "MauiContext is null" exception.

So my questions are:
a) why is the CreateWindow called on a resize in the first place?
b) is it possible to avoid that? It's a single-window-app and it's able to resize its content (XAML is doing a good job here). I like the app to be resized - but I don't want it to create a new window for that
c) if b) is not possible - then how could I return a Window in CreateWindow that contains the "old" MasterDetail-Page with it's FlyoutMenu and it's Detail-Page with all it's Navigation-Stack?

I'm not using the Shell but classic Navigation Pages

I yet have to test if this problem occurs in the simpler split-screen-view on that android tablet too and if such problem could be solved by using MainPage again … but that's deprecated, right? so …

Thank you very much - I really hope there is an (easy?) solution to this.

EDIT:
Sure enough:

• same problem with simple Split-Screen on Android; As soon as you put another App side-by-side to the Maui-App, the CreateWindow is called and I don't know how to maintain the current Main-Page
• Switching Back to the old MainPage = ... WORKS! It gives compiler warnings (obsolete, deprecated) but it works in side-by-side mode and in Dex-Mode with resizing Windows.

So current workaround is to use the good old MainPage-approach … but this cannot be the solution as this is deprecated already.

I still hope that anyone knows how to do this with the CreateWindow logic (or even better: knows how to avoid getting a createWindow Call when the window is resized.

[PySom]

hi @bnSonic, could try looking up the window life cycle event. You may be able to see an event to hook on to achieve your result.