Inheritance of the WebChromeClient to intercept the FileChooser event

FileChooserWebChromeClient.cs

public class FileChooserWebChromeClient : WebChromeClient
{
    private Action<IValueCallback, Java.Lang.String, Java.Lang.String> callback;

    public FileChooserWebChromeClient (Action<IValueCallback, Java.Lang.String, Java.Lang.String> callback)
    {
        callback = callback;
    }

    // For Android < 5.0
    [Java.Interop.Export]
    public void openFileChooser (IValueCallback uploadMsg, Java.Lang.String acceptType, Java.Lang.String capture)
    {
        callback (uploadMsg, acceptType, capture);
    }

    // For Android > 5.0
    public override Boolean OnShowFileChooser (Android.Webkit.WebView webView, IValueCallback uploadMsg, WebChromeClient.FileChooserParams fileChooserParams)
    {
        try {
            callback (uploadMsg, null, null);
        } catch (Exception) {

        }
        return true;
    }
}