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[Android AppCompat] Add defensive code to prevent NRE in GetNativeSize #14933

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Dec 1, 2021
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[Android AppCompat] Add defensive code to prevent NRE in GetNativeSize #14933

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6 changes: 5 additions & 1 deletion Xamarin.Forms.Platform.Android/AppCompat/Platform.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -184,9 +184,13 @@ public static SizeRequest GetNativeSize(VisualElement view, double widthConstrai
{
Performance.Start(out string reference);

// FIXME: potential crash
IVisualElementRenderer visualElementRenderer = Android.Platform.GetRenderer(view);

if (visualElementRenderer == null || visualElementRenderer.View.IsDisposed())
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Do we know when this happen?

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Not really, I see it in the stack traces of the mentioned issues and this code was implemented for the fast renderers but not here. So I guess it doesn't hurt :)

{
return new SizeRequest(Size.Zero, Size.Zero);
}

var context = visualElementRenderer.View.Context;

// negative numbers have special meanings to android they don't to us
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