GSON - Custom serializer in specific case

Question

I have this schema :

public class Student {        public String name;        public School school; }  public class School {        public int id;        public String name; } public class Data {       public ArrayList<Student> students;       public ArrayList<School> schools; } 

I would like to serialize the Data object with Gson, and get something like :

{ "students": [{                   "name":"name1",                  "school": "1"          //the id of the scool, not its entire Json               }],   "school": [{                        //the entire JSON               "id" : "1",               "name": "schoolName"             }] } 

To make that, I must use custom serializer for the student part, so that Gson only print the id of the School. But for the School, I have to have nomal serializer.

How can I do everything with only one Gson object ?

Answer 1

You can write a custom serializer something like this:

public class StudentAdapter implements JsonSerializer<Student> {   @Override  public JsonElement serialize(Student src, Type typeOfSrc,             JsonSerializationContext context) {          JsonObject obj = new JsonObject();         obj.addProperty("name", src.name);         obj.addProperty("school", src.school.id);          return obj;     } } 

Answer 2

Of course wherever you are going to serialize this object you need to add it to the Gson like this:

Gson gson = new GsonBuilder()     .registerTypeAdapter(Student.class, new StudentAdapter())     .create(); return gson.toJson([YOUR_OBJECT_TO_BE_SERIALIZED]);