Xamarin Android binding class FooInvoker does not implement interface setter

Question

I have a Xamarin Android binding error that makes no sense!

The generated class stubs are:

[global::Android.Runtime.Register ("com/scichart/drawing/common/IRenderSurface", DoNotGenerateAcw=true)]
internal class IRenderSurfaceInvoker : global::Java.Lang.Object, IRenderSurface


[Register ("com/scichart/drawing/common/IRenderSurface", "", "Com.Scichart.Drawing.Common.IRenderSurfaceInvoker")]
public partial interface IRenderSurface : global::Com.Scichart.Core.Framework.IInvalidatableElement, global::Com.Scichart.Core.Framework.IView { } 

// Metadata.xml XPath interface reference: path="/api/package[@name='com.scichart.core.framework']/interface[@name='IView']"
[Register ("com/scichart/core/framework/IView", "", "Com.Scichart.Core.Framework.IViewInvoker")]
public partial interface IView : global::Com.Scichart.Core.Framework.IContextProvider, global::Com.Scichart.Core.Framework.IHitTestable 
{

    int Visibility 
    {
        // Metadata.xml XPath method reference: path="/api/package[@name='com.scichart.core.framework']/interface[@name='IView']/method[@name='getVisibility' and count(parameter)=0]"
        [Register ("getVisibility", "()I", "GetGetVisibilityHandler:Com.Scichart.Core.Framework.IViewInvoker, SciChart.Android.Core")] get;
        // Metadata.xml XPath method reference: path="/api/package[@name='com.scichart.core.framework']/interface[@name='IView']/method[@name='setVisibility' and count(parameter)=1 and parameter[1][@type='int']]"
        [Register ("setVisibility", "(I)V", "GetSetVisibility_IHandler:Com.Scichart.Core.Framework.IViewInvoker, SciChart.Android.Core")] set;
    }
}

What's happening is IView.Visibility (which has get, set) is conflicting with a base class Android.View.Visibility. I've worked around the conflict in additions folder but there is this IRenderSurfaceInvoker class which is generated, and not partial, and isn't implementing the IView interface properly.

Normally I'd ignore the property in metadata.xml and create it manually in a partial class, but that isn't possible as IRenderSurfaceInvoker is not partial.

What is a FooInvoker anyway??!

Any ideas? :)

EDIT: UPDATE

After Sven-Michael Stube's answer below, I have this partial solution:

<!-- In EnumMethods.xml -->
<mapping jni-interface="com/scichart/core/framework/IView">
    <method jni-name="getVisibility" parameter="return" clr-enum-type="Android.Views.ViewStates" />
    <method jni-name="setVisibility" parameter="visibility" clr-enum-type="Android.Views.ViewStates" />
</mapping>

But this results in the IView interface being generated as follows:

    global::Android.Views.ViewStates Visibility {
        // Metadata.xml XPath method reference: path="/api/package[@name='com.scichart.core.framework']/interface[@name='IView']/method[@name='getVisibility' and count(parameter)=0]"
        [Register ("getVisibility", "()I", "GetGetVisibilityHandler:Com.Scichart.Core.Framework.IViewInvoker, SciChart.Android.Core")] get;
    }

and the warning output

<attr path="/api/package[@name='com.scichart.core.framework']/interface[@name='IView']‌/method[@name='setVisibility']/parameter[@name='visibility']"/> matched no nodes

In other words, the EnumMethods.xml declaration above deletes the setter as it cannot find a match.

How can I debug this?

Dr. Andrew Burnett-Thompson · Accepted Answer · 2016-04-14 18:49:58Z

1

I think you don't have to workaround your View vs IView problem. You should override the return value of the getter and the parameter of the setter to be Android.Views.ViewStates in EnumMethods.xml. This may solve your problem if you do it consistently.

<mapping jni-interface="com/scichart/core/framework/IView">
    <method jni-name="getVisibility" parameter="return" clr-enum-type="Android.Views.ViewStates" />
    <method jni-name="setVisibility" parameter="p0" clr-enum-type="Android.Views.ViewStates" />
</mapping>

edited Apr 14, 2016 at 18:49

Dr. Andrew Burnett-Thompson

21.7k9 gold badges93 silver badges187 bronze badges

answered Apr 10, 2016 at 21:14

Sven-Michael Stübe

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4 Comments

Dr. Andrew Burnett-Thompson Over a year ago

One small problem. jni-class should be jni-interface otherwise both nodes cannot be found. But even then it replaces the getVisbility and deletes the setVisibility with the warning <attr path="/api/package[@name='com.scichart.core.framework']/interface[@name='IView']/method[@name='setVisibility']/parameter[@name='visibility']"/> matched no nodes Any ideas?

Sven-Michael Stübe Over a year ago

is the parameter called `visibility? This was just a guess.

Dr. Andrew Burnett-Thompson Over a year ago

In java, yes it is. C# still can't find it. I have however named it to p0 and it randomly worked :0

Dr. Andrew Burnett-Thompson Over a year ago

I edited your answer to fix + accepted. Thanks for help!

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