Check for ContainsGenericParameters

03-13 17:12:03.271 14568 14588 E NUnit   :  : System.NotSupportedException : 'Java.InteropTests.GenericHolder`1[T]' contains a generic type definition. This is not supported.
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.Interop.JniRuntime.JniTypeManager.GetTypeSignature(Type )
03-13 17:12:03.274 14568 14588 E NUnit   :    at Android.Runtime.JNIEnv.GetJniName(Type )
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.Interop.TypeManager.RegisterType(String , Type )
03-13 17:12:03.274 14568 14588 E NUnit   :    at Android.Runtime.JNIEnvInit.RegisterJniNatives(IntPtr , Int32 , IntPtr , IntPtr , Int32 )
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.Interop.JniEnvironment.Object.AllocObject(JniObjectReference )
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.Interop.JniType.AllocObject()
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.Interop.JniPeerMembers.JniInstanceMethods.StartCreateInstance(String , Type , JniArgumentValue* )
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.Lang.Object..ctor()
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.InteropTests.GenericHolder`1[[System.Int32, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]..ctor()
03-13 17:12:03.274 14568 14588 E NUnit   :    at Java.InteropTests.JnienvTest.NewClosedGenericTypeWorks()
03-13 17:12:03.274 14568 14588 E NUnit   :    at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
03-13 17:12:03.274 14568 14588 E NUnit   :    at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object , BindingFlags )

Author: jonathanpeppers

src/Mono.Android/Android.Runtime/JNIEnv.cs

@@ -477,7 +477,10 @@ public static string GetJniName (Type type)
 			if (type == null)
 				throw new ArgumentNullException ("type");
 
-			var sig  = JNIEnvInit.androidRuntime?.TypeManager.GetTypeSignature (type) ?? default;
+			JniTypeSignature sig = default;
+			if (!type.ContainsGenericParameters)
+				sig = JNIEnvInit.androidRuntime?.TypeManager.GetTypeSignature (type) ?? default;
+
 			return sig == null
 				? JavaNativeTypeManager.ToJniName (type)
 				: sig.Name;