android mapping JSONObject

I am downloading an object from a service with jsonObjectRequest and this object contains a byte [] in its properties, but in the class I use to map (in android), it does not let me pick up a byte []. This is the constructor of the class:

public DocumentoObject(JSONObject o)
{
    try
    {          
        if(!o.isNull("ID")) this.ID = o.getInt("ID");
        if(!o.isNull("Contenido")) this.Contenido = o.get...
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
}

in that this.Contenido = o.get... is where I'm interested in doing o.getByteArray . Is there any chance to do something like that?

The code of the download is:

jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, uri, parametros, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            DocumentoObject documento = new DocumentoObject(response);

and in that documento is where I want to get the Contenido .

Thanks in advance!