Gson Property Order In Android

I have integrated Gson to create the json used in a request for an android application. Here is my model class public class TwitterUser { @Expose public String gid; public String

Solution 1:

Gson doesn't support definition of property order out of the box, but there are other libraries that do. Jackson allows defining this with @JsonPropertyOrder, for example.

But of course Gson has it's way so you can do it by creating your very own Json serializer:

publicclassTwitterUserSerializerimplementsJsonSerializer<TwitterUser> {

    @OverridepublicJsonElementserialize(TwitterUser twitterUser, Type type, JsonSerializationContext context) {
        JsonObjectobject = newJsonObject();
        object.add("gid", context.serialize(twitterUser.getGid());
        object.add("displayName", context.serialize(twitterUser.getDisplayName());
        // ...returnobject;
    }
}

Then of course you need to pass this serializer to Gson during Setup like this:

Gsongson=newGsonBuilder().registerTypeAdapter(TwitterUser.class, newTwitterUserSerializer()).excludeFieldsWithoutExposeAnnotation().create();
Stringjson= gson.toJson(twitterUser);

See also:

• Gson User Guide - Custom serializers and deserializers