Note
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Example message
warning XA4257: Skipping Java peer type 'Google.Android.Material.Shadow.ShadowDrawableWrapper' from assembly 'Xamarin.Google.Android.Material' because referenced type 'AndroidX.AppCompat.Graphics.Drawable.DrawableWrapper' from assembly 'Xamarin.AndroidX.AppCompat.AppCompatResources' could not be resolved in '/home/user/.nuget/packages/xamarin.androidx.appcompat.appcompatresources/1.6.0/lib/net6.0-android31.0/Xamarin.AndroidX.AppCompat.AppCompatResources.dll'. This type will not be included in the trimmable type map.
Issue
The trimmable type map found a Java peer type whose managed base type, implemented interface, or generic parameter constraint references a type that is not present in the resolved assembly set.
This can happen when NuGet packages in the Android binding graph were built against different versions of another binding package. The type may be unused by the app, but NativeAOT compiles a closed world and must resolve rooted managed types eagerly.
Solution
If your app uses the skipped type, update the affected NuGet packages so the referenced type exists, or update to versions of the binding packages that are compatible with each other.
If your app does not use the skipped type, no action is required. The type is omitted from the trimmable type map so NativeAOT does not fail while resolving unused stale metadata.