How to get a particular object from JSON array [Android] [duplicate]

Question

I have a response json like this,

[{
  "userId": 1,
  "id": 1,
  "title": "quidem molestiae enim"
},
{
  "userId": 2,
  "id": 2,
  "title": "sunt qui excepturi placeat culpa"
},
{
  "userId": 3,
  "id": 3,
  "title": "omnis laborum odio"
}]

I want to show detail from userId = 3, I wasn't provided an endpoint to get detail. So I want to get detail from this endpoint.

in App:

I've shown the data for dashboard (using recyclerview/list)
After that, I want to go to detail from one data that I selected.
Case: I'm using 1 endpoint (like above)

Go over the JSON Array and check for the property userId and see if it equals 3. — tomerpacific
– tomerpacific, Commented Mar 11, 2019 at 11:36
No it's json already. The case, I just want to get {"userId" : 3, "id" : 3, "title" : "omnis laborum odio"} — yoppie97
– yoppie97, Commented Mar 11, 2019 at 11:47

song bo · Accepted Answer · 2019-03-11 12:07:55Z

0

        JSONArray jsonArray = (JSONArray) JSON.parse(str);
        Map map = jsonArray.stream().map( obj -> {JSONObject jsonobject = (JSONObject) obj;return jsonobject;}).collect(Collectors.toMap(obj->obj.getIntValue("userId"),obj->obj.toJSONString()));
        System.out.println(map.get(3));

answered Mar 11, 2019 at 12:07

song bo

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Comments

SinaMN75 · Accepted Answer · 2019-03-11 11:57:41Z

-2

the start point of json must always be a jsonObject not jsonArray. head to your backend developer and ask him or her to put your jsonArray inside a jsonObject.

{
    "docs":[{
        "userId": 1,
        "id": 1,
        "title": "quidem molestiae enim"
      },
      {
        "userId": 2,
        "id": 2,
        "title": "sunt qui excepturi placeat culpa"
      },
      {
        "userId": 3,
        "id": 3,
        "title": "omnis laborum odio"
      }]
}

answered Mar 11, 2019 at 11:57

SinaMN75

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