How to add a method to a Binding Library in Xamarin.Android?

I've been fixing a library in Xamarin.Android:

https://stackoverflow.com/a/56778629/2889347

However, I found that an important method is missing in my code:

/**
 * Sets a custom adapter for suggestions list view.
 *
 * @param suggestionAdapter customized adapter
 */
public void setCustomSuggestionAdapter(SuggestionsAdapter suggestionAdapter) {
    this.adapter = suggestionAdapter;
    RecyclerView recyclerView = findViewById(R.id.mt_recycler);
    recyclerView.setAdapter(adapter);
}

I tried to implement a partial class:

using System;
using System.Collections.Generic;
using Android.Runtime;
using Java.Interop;

namespace Com.Mancj.Materialsearchbar
{

    public partial class MaterialSearchBar
    {
    }
}

But I get a message like this one:

Partial class with single part.

The generated class is this one: https://www.dropbox.com/s/cb9oqtp6efys843/Com.Mancj.Materialsearchbar.MaterialSearchBar.cs?dl=0

I experienced in the past still a very specific issue that I couldn't use the FindViewByID since it was not able to find anything and I also tried a code like this one in my Metadata.xml:

<add-node path="/api/package[@name='com.mancj.materialsearchbar.adapter']/class[@name='MaterialSearchBar']/method[@name='setCustomSuggestionAdapter'] and count(parameter)=1 and parameter[1][@type='Com.Mancj.Materialsearchbar.Adapter.SuggestionsAdapter']" />

But the VS crashes:

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Bindings.targets(5,5):
Error MSB6006: "generator.exe" exited with code 1. (MSB6006)
(Xamarin-SearchBar-V2)

If you want to test my current version of the code:

https://github.com/FANMixco/Xamarin-SearchBar

Thanks for any idea.

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