Insert a background image in xamarin

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C#

Android

Xamarin

Hello everybody,

I have a from where i have several fields,
Now i want to add a Background image on the form, but after did it the whole fields on the form moved down:
This is the code:

<Image Source="fondopantalla.png" 
                        AbsoluteLayout.LayoutBounds="0,0,0,0"
                        AbsoluteLayout.LayoutFlags="All"
                        VerticalOptions="FillAndExpand"
                        Aspect="AspectFill"
                        IsVisible="true"
                        HeightRequest="650"
                    />

How can i do it?

What I have tried:

Trying to insert a background image