Parsing JSON using Google GSON: reading values directly from child objects

Question

I'm having trouble parsing the following JSON with Google's Gson:

{"Name":
    {"object1":   
       {"field1":"17",
        "field2":"360",
        "field3":"19",
        "field4":"sun",
        "field5":"rain"
       }
    }
}

I have tried the following to get the value of field1 but it doesn't work

@SerializedName("Name/object1/field1")
public int fieldOne;

What am I doing wrong?

+1. Kind of surprising that Gson doesn't seem to have a notation like `@SerializedName("Name/object1")` or `@SerializedName("Name.object1")` for getting values from child objects directly. — Jonik, Oct 25 '13 at 15:16
(Btw, removed Android tag as this is not Android specific at all.) — Jonik, Oct 25 '13 at 15:19

score 3 · Accepted Answer · answered Aug 20 '12 at 00:49

Your objects have to conserve the hierarchy of your json instructions. For your example, it would be something like this:

public class Object {

    @SerializedName("field1")
    public String fieldOne;

    @SerializedName("field2")
    public String fieldTwo;

    @SerializedName("field3")
    public String fieldThree;

    @SerializedName("field4")
    public String fieldFour;
}

public class Name {

    @SerializedName("object1")
    public Object obj;
}

public class GsonObj {

    @SerializedName("Name")
    public Name name;
}

Using the following call:

String json = "{\"Name\":{" +
            "\"object1\":{" +
            "\"field1\":\"17\",\"field2\":\"360\",\"field3\":\"19\",\"field4\":\"sun\",\"field5\":\"rain\"}}}";

Gson gson = new Gson();
GsonObj jsonResult = gson.fromJson(json, GsonObj.class);
Log.d("test", "field one: "+jsonResult.name.obj.fieldOne);
Log.d("test", "field two: "+jsonResult.name.obj.fieldTwo);
Log.d("test", "field three: "+jsonResult.name.obj.fieldThree);
Log.d("test", "field four: "+jsonResult.name.obj.fieldFour);

score 1 · Answer 2 · answered Aug 19 '12 at 19:40

1

You have invalid JSON. JSON may either start with { or [ so you need to wrap your string with another pair of {}.

A good practice is to always check your data first. I often use this here: http://jsonlint.com/

answered Aug 19 '12 at 19:40

Kai Mattern

3,090
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sorry i missed those brackets, I do have them – Dave Aug 19 '12 at 19:42
You still miss 1 bracket. Just at the end. – Kai Mattern Aug 19 '12 at 19:44

score 0 · Answer 3 · edited May 23 '17 at 12:23

0

I don't think you can have "Name/object1/field" you have to specify key name directly without hierarchy. refer How to parse dynamic JSON fields with GSON?

edited May 23 '17 at 12:23

Community

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1

answered Aug 19 '12 at 19:47

Taranfx

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Parsing JSON using Google GSON: reading values directly from child objects

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