GSON parsing dynamic JSON field

Question

I can't seem to figure this out. I've looked at a couple SO posts (here, and here), and my situation is just a little different.

I'm not sure if I have to register a new TypeToken or what. But my JSON object looks like this:

{
    "id": 6,
    "error": "0",
    "dates": {
        34234 : "2011-01-01" // I want to parse the date into a string.
        87474 : "2011-08-09" // The first values are all unique.
        .                    //this can be any number of entries.
        .
        .
        74857 : "2011-09-22"
    }
}

I've created both of my objects like this:

public class Response {

    public Integer id;
    public String error;
    public DateList dates;
}

Separate file:

public class DateList {

    public List<Map<Integer, String>> dateString;
}

I'm not sure how to tweek it to get it right. Documentation doesn't seem to help... And the other examples I've seen are parsing a custom object, not a string type.

Thanks!

I don't know what GSON is, but List<Map<Integer, String> is at least missing a >. Also, shouldn't it be just a map and not a list of maps? — svens
– svens, Commented Oct 4, 2011 at 18:16
Sorry I didn't copy and pasted that code. Thanks for the help! — Matt W.
– Matt W., Commented Oct 4, 2011 at 18:44

M.L. · Accepted Answer · 2011-10-04 18:22:17Z

14

I tried it in this form:

The Json

{
    "id": 6,
    "error": "0",
    "dates": {
        "34234" : "2011-01-01"
        "87474" : "2011-08-09"
        "74857" : "2011-09-22"
    }
}

And the Response.java

public class Response {
    public Integer id;
    public String error;
    public Map<Integer, String> dates;
}

At least that seemed to work out of the box.

answered Oct 4, 2011 at 18:22

M.L.

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2 Comments

Matt W. Over a year ago

Thanks!! I knew it was something easy!

terencey Over a year ago

Worked for me too. I thought I had to write a custom TypeAdapter or something magical.

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