diff --git a/src/Microsoft.Android.Sdk.TrimmableTypeMap/Generator/TypeMapAssemblyEmitter.cs b/src/Microsoft.Android.Sdk.TrimmableTypeMap/Generator/TypeMapAssemblyEmitter.cs
index 34bfd15a9b6..101eec9618c 100644
--- a/src/Microsoft.Android.Sdk.TrimmableTypeMap/Generator/TypeMapAssemblyEmitter.cs
+++ b/src/Microsoft.Android.Sdk.TrimmableTypeMap/Generator/TypeMapAssemblyEmitter.cs
@@ -207,7 +207,12 @@ void EmitTypeReferences ()
 	void EmitMemberReferences ()
 	{
 		_baseCtorRef = _pe.AddMemberRef (_javaPeerProxyRef, ".ctor",
-			sig => sig.MethodSignature (isInstanceMethod: true).Parameters (0, rt => rt.Void (), p => { }));
+			sig => sig.MethodSignature (isInstanceMethod: true).Parameters (2,
+				rt => rt.Void (),
+				p => {
+					p.AddParameter ().Type ().Type (_systemTypeRef, false);
+					p.AddParameter ().Type ().Type (_systemTypeRef, false);
+				}));
 
 		_getTypeFromHandleRef = _pe.AddMemberRef (_systemTypeRef, "GetTypeFromHandle",
 			sig => sig.MethodSignature ().Parameters (1,
@@ -360,12 +365,24 @@ void EmitProxyType (JavaPeerProxyData proxy, Dictionary<string, MethodDefinition
 			metadata.AddInterfaceImplementation (typeDefHandle, _iAndroidCallableWrapperRef);
 		}
 
-		// .ctor
+		// .ctor — pass TargetType and InvokerType to base ctor
 		_pe.EmitBody (".ctor",
 			MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName,
 			sig => sig.MethodSignature (isInstanceMethod: true).Parameters (0, rt => rt.Void (), p => { }),
 			encoder => {
 				encoder.OpCode (ILOpCode.Ldarg_0);
+				// arg 1: typeof(TargetType)
+				encoder.OpCode (ILOpCode.Ldtoken);
+				encoder.Token (_pe.ResolveTypeRef (proxy.TargetType));
+				encoder.Call (_getTypeFromHandleRef);
+				// arg 2: typeof(InvokerType) or null
+				if (proxy.InvokerType != null) {
+					encoder.OpCode (ILOpCode.Ldtoken);
+					encoder.Token (_pe.ResolveTypeRef (proxy.InvokerType));
+					encoder.Call (_getTypeFromHandleRef);
+				} else {
+					encoder.OpCode (ILOpCode.Ldnull);
+				}
 				encoder.Call (_baseCtorRef);
 				encoder.OpCode (ILOpCode.Ret);
 			});
@@ -373,16 +390,6 @@ void EmitProxyType (JavaPeerProxyData proxy, Dictionary<string, MethodDefinition
 		// CreateInstance
 		EmitCreateInstance (proxy);
 
-		// get_TargetType
-		EmitTypeGetter ("get_TargetType", proxy.TargetType,
-			MethodAttributes.Public | MethodAttributes.Virtual | MethodAttributes.SpecialName | MethodAttributes.HideBySig);
-
-		// get_InvokerType
-		if (proxy.InvokerType != null) {
-			EmitTypeGetter ("get_InvokerType", proxy.InvokerType,
-				MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig);
-		}
-
 		// UCO wrappers
 		foreach (var uco in proxy.UcoMethods) {
 			var handle = EmitUcoMethod (uco);
@@ -646,22 +653,6 @@ MemberReferenceHandle AddActivationCtorRef (EntityHandle declaringTypeRef)
 				}));
 	}
 
-	void EmitTypeGetter (string methodName, TypeRefData typeRef, MethodAttributes attrs)
-	{
-		var handle = _pe.ResolveTypeRef (typeRef);
-
-		_pe.EmitBody (methodName, attrs,
-			sig => sig.MethodSignature (isInstanceMethod: true).Parameters (0,
-				rt => rt.Type ().Type (_systemTypeRef, false),
-				p => { }),
-			encoder => {
-				encoder.OpCode (ILOpCode.Ldtoken);
-				encoder.Token (handle);
-				encoder.Call (_getTypeFromHandleRef);
-				encoder.OpCode (ILOpCode.Ret);
-			});
-	}
-
 	MethodDefinitionHandle EmitUcoMethod (UcoMethodData uco)
 	{
 		var jniParams = JniSignatureHelper.ParseParameterTypes (uco.JniSignature);
diff --git a/src/Mono.Android/Java.Interop/JavaPeerProxy.cs b/src/Mono.Android/Java.Interop/JavaPeerProxy.cs
index 0fe4b72cc48..08bc2c538f1 100644
--- a/src/Mono.Android/Java.Interop/JavaPeerProxy.cs
+++ b/src/Mono.Android/Java.Interop/JavaPeerProxy.cs
@@ -18,32 +18,42 @@ namespace Java.Interop
 	[AttributeUsage (AttributeTargets.Class | AttributeTargets.Interface, Inherited = false, AllowMultiple = false)]
 	public abstract class JavaPeerProxy : Attribute
 	{
+		/// <summary>
+		/// Initializes a new proxy with the specified target and invoker types.
+		/// </summary>
+		/// <param name="targetType">The managed peer type this proxy represents.</param>
+		/// <param name="invokerType">The invoker type for interfaces/abstract classes, or <c>null</c> for concrete types.</param>
+		protected JavaPeerProxy (
+			Type targetType,
+			[DynamicallyAccessedMembers (DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
+			Type? invokerType)
+		{
+			TargetType = targetType;
+			InvokerType = invokerType;
+		}
+
 		/// <summary>
 		/// Creates an instance of the target type using the JNI handle and ownership semantics.
 		/// This replaces the reflection-based constructor invocation used in the legacy path.
 		/// </summary>
-		/// <param name="handle">The JNI object reference handle.</param>
-		/// <param name="transfer">How to handle JNI reference ownership.</param>
-		/// <returns>A new instance of the target type wrapping the JNI handle, or null if activation is not supported.</returns>
 		public abstract IJavaPeerable? CreateInstance (IntPtr handle, JniHandleOwnership transfer);
 
 		/// <summary>
 		/// Gets the target .NET type that this proxy represents.
 		/// </summary>
-		public abstract Type TargetType { get; }
+		public Type TargetType { get; }
 
 		/// <summary>
 		/// Gets the invoker type for interfaces and abstract classes.
 		/// Returns null for concrete types that can be directly instantiated.
 		/// </summary>
 		[DynamicallyAccessedMembers (DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
-		public virtual Type? InvokerType => null;
+		public Type? InvokerType { get; }
 
 		/// <summary>
 		/// Gets a factory for creating containers (arrays, collections) of the target type.
 		/// Enables AOT-safe creation of generic collections without <c>MakeGenericType()</c>.
 		/// </summary>
-		/// <returns>A factory for creating containers of the target type, or null if not supported.</returns>
 		public virtual JavaPeerContainerFactory? GetContainerFactory () => null;
 	}
 
@@ -59,7 +69,9 @@ public abstract class JavaPeerProxy<
 		T
 	> : JavaPeerProxy where T : class, IJavaPeerable
 	{
-		public override Type TargetType => typeof (T);
+		protected JavaPeerProxy (
+			[DynamicallyAccessedMembers (DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)]
+			Type? invokerType) : base (typeof (T), invokerType) { }
 
 		public override JavaPeerContainerFactory GetContainerFactory ()
 			=> JavaPeerContainerFactory<T>.Instance;