Question

My class is like:

class Foo {
   public String duration;
   public String height;
}

And my json data looks like

{"duration":"12200000", "height":"162"}

Now I want to deserialize it by

 Foo foo = gson.fromJson(jsonStr, Foo.class);

So that,
foo.duration is “20 mins” (number of minutes),
foo.height is “162cm”

Is this possible to do using Gson?

Thanks!

Answer 1

GSON allows creation of custom deserializers/serializers. Try to read here.

Sorry for without an example.

class FooDeserializer implements JsonDeserializer<Foo>{
   @Override
   public Foo deserialize(JsonElement json, Type typeOfT,
   JsonDeserializationContext context) throws JsonParseException {

    JsonObject jo = (JsonObject)json;
    String a = jo.get("duration").getAsString()+" mins";
    String b = jo.get("height").getAsString() + " cm";

//Should be an appropriate constructor
    return new Foo(a,b);
    }               
}

then:

Gson gson = new GsonBuilder().registerTypeAdapter(Foo.class, foo.new FooDeserializer()).create();

and you should receive result as you wish it to get using fromJson(...).