[Mono.Android] Root Mono.Android.Export from the [Export]/[ExportField] loader, not the attributes

src/Mono.Android/Android.Runtime/AndroidRuntime.cs

@@ -311,6 +311,7 @@ public override void DeleteWeakGlobalReference (ref JniObjectReference value)
 	}
 
 	[UnconditionalSuppressMessage ("Trimming", "IL2026", Justification = "Temporary suppression for Java.Interop reflection manager base.")]
+	[RequiresUnreferencedCode ("AndroidTypeManager is reflection-backed (it loads Mono.Android.Export for [Export] members) and is not trimming-compatible.")]
 	class AndroidTypeManager : JniRuntime.ReflectionJniTypeManager {
 		bool jniAddNativeMethodRegistrationAttributePresent;
 
@@ -401,9 +402,10 @@ protected override IEnumerable<string> GetSimpleReferences (Type type)
 
 		static MethodInfo? dynamic_callback_gen;
 
-		// See ExportAttribute.cs
-		[UnconditionalSuppressMessage ("Trimming", "IL2026", Justification = "Mono.Android.Export.dll is preserved when [Export] is used via [DynamicDependency].")]
-		[UnconditionalSuppressMessage ("Trimming", "IL2075", Justification = "Mono.Android.Export.dll is preserved when [Export] is used via [DynamicDependency].")]
+		// See ExportAttribute.cs. The [DynamicDependency] roots Mono.Android.Export only when this
+		// loader is kept by the linker (the managed/reflection [Export] path). The trimmable type map
+		// generates JavaPeerProxy code instead and never calls this, so it does not pull in the assembly.
+		[DynamicDependency (DynamicallyAccessedMemberTypes.All, "Java.Interop.DynamicCallbackCodeGenerator", "Mono.Android.Export")]
 		static Delegate CreateDynamicCallback (MethodInfo method)
 		{
 			if (dynamic_callback_gen == null) {

src/Mono.Android/Android.Runtime/JNIEnvInit.cs

@@ -168,6 +168,7 @@ internal static unsafe void Initialize (JnienvInitializeArgs* args)
 		[UnmanagedCallConv (CallConvs = new[] { typeof (CallConvCdecl) })]
 		private static unsafe partial void xamarin_app_init (IntPtr env, delegate* unmanaged <int, int, int, IntPtr*, void> get_function_pointer);
 
+		[UnconditionalSuppressMessage ("Trimming", "IL2026", Justification = "The AndroidTypeManager branch is only reached when RuntimeFeature.TrimmableTypeMap is false; the linker substitutes the feature switch and trims this branch in trimmable apps.")]
 		internal static JniRuntime.JniTypeManager CreateTypeManager (JnienvInitializeArgs args)
 		{
 			if (RuntimeFeature.TrimmableTypeMap) {

src/Mono.Android/ApiCompatLinesToAdd.txt

@@ -0,0 +1,2 @@
+CannotRemoveAttribute : Attribute 'System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute' exists on 'Java.Interop.ExportAttribute' in the contract but not the implementation.
+Total Issues: 1

src/Xamarin.Android.NamingCustomAttributes/Java.Interop/ExportAttribute.cs

@@ -1,26 +1,20 @@
 using System;
-using System.Diagnostics.CodeAnalysis;
 
 namespace Java.Interop {
 
 	[Serializable]
 	[AttributeUsage (AttributeTargets.Method | AttributeTargets.Constructor, 
 			AllowMultiple=false, 
 			Inherited=false)]
-#if !NETSTANDARD2_0
-	[RequiresUnreferencedCode ("[ExportAttribute] uses dynamic features.")]
-#endif
 #if !JCW_ONLY_TYPE_NAMES
 	public
 #endif  // !JCW_ONLY_TYPE_NAMES
 	partial class ExportAttribute : Attribute {
 
-		[DynamicDependency (DynamicallyAccessedMemberTypes.All, "Java.Interop.DynamicCallbackCodeGenerator", "Mono.Android.Export")]
 		public ExportAttribute ()
 		{
 		}
 
-		[DynamicDependency (DynamicallyAccessedMemberTypes.All, "Java.Interop.DynamicCallbackCodeGenerator", "Mono.Android.Export")]
 		public ExportAttribute (string name)
 		{
 			Name = name;

tests/api-compatibility/acceptable-breakages-vReference-net11.0.txt

@@ -48,3 +48,4 @@ MembersMustExist : Member 'public void Android.Telecom.CallControl.RequestVideoS
 TypesMustExist : Type 'Android.Text.IInputType' does not exist in the implementation but it does exist in the contract.
 TypesMustExist : Type 'Xamarin.Android.Net.AndroidClientHandler' does not exist in the implementation but it does exist in the contract.
 CannotRemoveBaseTypeOrInterface : Type 'Android.Views.InputMethods.EditorInfo' does not implement interface 'Android.Text.IInputType' in the implementation but it does in the contract.
+CannotRemoveAttribute : Attribute 'System.Diagnostics.CodeAnalysis.RequiresUnreferencedCodeAttribute' exists on 'Java.Interop.ExportAttribute' in the contract but not the implementation.