Inherit class from AndroidJavaObject

Hi, I have a class defined like this:

 public class JavaIntent : AndroidJavaObject {    
     public JavaIntent () : base("android.content.Intent")
     {
     }
 }

And using it like:

 public static void StartIntentChooser(JavaIntent intent)
 {
     var player = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
     var activity = player.GetStatic<AndroidJavaObject>("currentActivity");
     activity.Call("startActivity", intent); 
 }

I'm trying to make wrappers to Android SDK's classes, but I'm getting this error:

JNI: Unknown signature for type 'JavaIntent' (obj = JavaIntent) instance

Does any one have a clue of what's going on?

Thanks, Martín.

EDIT

Inspecting the assmebly browser I found that calls to AndroidJavaObject make a type check like this one:

 if (typeof(ReturnType) == typeof(AndroidJavaObject))
 {
     IntPtr jobject = AndroidJNI.CallObjectMethod (this.m_jobject, cachedMethodID, args2);
     return (ReturnType)new AndroidJavaObject (jobject);
 }

My JavaIntent class, derived from AndroidJavaObject doesn't pass this check.

I thought about making a custom AndroidJavaObject class, but that may be hard. Does any one have a better approach?

Thanks again, Martín.