Realm, GSON and primitive JSON arrays

CustomTypeAdapter.java

// Make a custom Gson instance, with a custom TypeAdapter for each wrapper object.
// In this instance we only have RealmList<RealmInt> as a a wrapper for RealmList<Integer>
Type token = new TypeToken<RealmList<RealmInt>>(){}.getType();
Gson gson = new GsonBuilder()
        .setExclusionStrategies(new ExclusionStrategy() {
            @Override
            public boolean shouldSkipField(FieldAttributes f) {
                return f.getDeclaringClass().equals(RealmObject.class);
            }

            @Override
            public boolean shouldSkipClass(Class<?> clazz) {
                return false;
            }
        })
        .registerTypeAdapter(token, new TypeAdapter<RealmList<RealmInt>>() {

            @Override
            public void write(JsonWriter out, RealmList<RealmInt> value) throws IOException {
                // Ignore
            }

            @Override
            public RealmList<RealmInt> read(JsonReader in) throws IOException {
                RealmList<RealmInt> list = new RealmList<RealmInt>();
                in.beginArray();
                while (in.hasNext()) {
                    list.add(new RealmInt(in.nextInt()));
                }
                in.endArray();
                return list;
            }
        })
        .create();

// Convert JSON to objects as normal
List<MainObject> objects = gson.fromJson(json, new TypeToken<List<MainObject>>(){}.getType());

// Copy objects to Realm
realm.beginTransaction();
realm.copyToRealm(objects);
realm.commitTransaction();

example.json

[
    { "name"  : "Foo",
      "ints" : [1, 2, 3]
    },
    { "name"  : "Bar",
      "ints" : []
    }
]  

MainObject.java

public class MainObject extends RealmObject {

    private String name;
    private RealmList<RealmInt> ints;

    // Getters and setters
}

RealmInt.java

public class RealmInt extends RealmObject {
    private int val;

    public RealmInt() {
    }

    public RealmInt(int val) {
        this.val = val;
    }

    // Getters and setters
}

Nevermind, I figured it out myself..
instead of using default gson builder, I used like below:

 Gson gson = RealmParserUtil.getGson();
        retrofit = new Retrofit.Builder()
                .baseUrl(Res.string(R.string.appconfig_api_base_url))
                .addConverterFactory(GsonConverterFactory.create(gson))
                .client(builder.build())
                .build();

My Custom RealmParser:

public class RealmParserUtil {
    public static Gson getGson(){
        Gson gson = new GsonBuilder()
                .setLenient()
                .setExclusionStrategies(new ExclusionStrategy() {
                    @Override
                    public boolean shouldSkipField(FieldAttributes f) {
                        return f.getDeclaringClass().equals(RealmObject.class);
                    }


                    @Override
                    public boolean shouldSkipClass(Class<?> clazz) {
                        return false;
                    }
                })
                .create();
        return gson;
    }


    public static String serialize(Object object) {
        return getGson().toJson(object);
    }

    public static Object deserialize(String objectString, Type type) {
        Log.i("SuperCustomer", "Deserializing json response");
        return getGson().fromJson(objectString, type);
    }


    public static class ArrayToStringTypeAdapter extends TypeAdapter<RealmList<RealmString>> {

        @Override
        public void write(JsonWriter out, RealmList<RealmString> value) throws IOException {
            //out.value(String.valueOf(value));
        }

        @Override
        public RealmList<RealmString> read(JsonReader in) throws IOException {
            RealmList<RealmString> list = new RealmList<RealmString>();

            boolean isArray = (in.peek() == JsonToken.BEGIN_ARRAY);

            if(isArray) {
                in.beginArray();
                while (in.hasNext()) {
                    list.add(new RealmString(in.nextString()));
                }
                in.endArray();
            }
            return list;
        }
    };
}

In my model class I used this:

    @JsonAdapter(RealmParserUtil.ArrayToStringTypeAdapter.class)
    private RealmList<RealmString> strInterests;

Thank you @Joisar for your gist, it helped me a lot.

@cmelchior
I implemented your solution but its not working for me. Do you have an update code for parsing primitive array string or int?
thanks!