Gson add field during serialization

Question

I can\'t find a simple way to add a custom field during serialization in Gson and I was hoping someone else may be able to help.

Here is a sample class to show my is

Answer 1

Use Gson.toJsonTree to get a JsonElement, with which you can interact dynamically.

A a = getYourAInstanceHere();
Gson gson = new Gson();
JsonElement jsonElement = gson.toJsonTree(a);
jsonElement.getAsJsonObject().addProperty("url_to_user", url);
return gson.toJson(jsonElement);