Constructor with ExportAttribute loses managed parameters

[outring]

Hi!

When a class constructor is decorated with [Export] in order to provide super arguments string, TypeManager.Activate() call loses constructor parameters types info and wrong (parameterless) constructor is being called instead.

MyView.cs:

public class MyView : Android.Views.View {
       public ItemFieldView(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
        {
        }

        [Export(SuperArgumentsString = "p0, null, proj.droid.proj.droid.R.attr.itemFieldStyle")]
        public MyView(Context context)
            : base(context, null, Resource.Attribute.myViewStyle)
        {
        }

        [Export(SuperArgumentsString = "p0, p1, proj.droid.proj.droid.R.attr.itemFieldStyle")]
        public MyView(Context context, IAttributeSet attrs)
            : base(context, attrs, Resource.Attribute.myViewStyle)
        {
        }

        public MyView(Context context, IAttributeSet attrs, int defStyleAttr)
            : base(context, attrs, defStyleAttr)
        {
        }

        public MyView(Context context, IAttributeSet attrs, int defStyleAttr, int defStyleRes)
            : base(context, attrs, defStyleAttr, defStyleRes)
        {
        }
}

The reason is that managedParameters are just not being passed to a new Signature at https://github.com/xamarin/java.interop/blob/master/src/Java.Interop.Tools.JavaCallableWrappers/Java.Interop.Tools.JavaCallableWrappers/JavaCallableWrapperGenerator.cs#L251

[atsushieno]

Export attribute is NOT supported on constructors.

[outring]

Hi, @atsushieno! Since when? Because according to the code it works. And, of course, according to this ticket.

[atsushieno]

It's not supported as in that its implementation is hacky and won't work other than those described on that bug. That cannot be at "supported" state.

Though it's looking something @jonpryor can take a look and fix, if that change makes it to work for you.

[outring]

If it's not so important to you can leave it as is, and I'll fix it when I find some time for it.