how to create a pojo class with dynamic key for arrayname

Question

I am working with Rxandroid and retrofit. I have a json with dynamically changing array name like this,

{
  "2016-10-02": [
    {
      "name": "foo",
      "id": "1",
      "category": "bar"

    },
    {
     "name": "foo",
      "id": "2",
      "category": "bar"
    },
    {
     "name": "foo",
      "id": "3",
      "category": "bar"
    },
    {
      "name": "foo",
      "id": "4",
      "category": "bar"
    }
  ],
  "2016-10-01": [
    {
      "name": "foo",
      "id": "5",
      "category": "bar"
    },
    {
      "name": "foo",
      "id": "6",
      "category": "bar"
    },
  ],
 "2016-10-03": [
    {
      "name": "foo",
      "id": "5",
      "category": "bar"
    }
  ]
}

The date key name for each array changes automatically and the number of array changes. In this example there are 3 arrays with date key. But the number of these array varies.

I have been through various links in stackoverflow but could not solve the issue.

You can go 2 ways. Implement your own deserializer or tell Retrofit that you want JsonObject(GSON library) as response and get the inner arrays from that object. — loshkin, Sep 29 '16 at 08:32
Check [this answer](http://stackoverflow.com/questions/7304002/how-to-parse-a-dynamic-json-key-in-a-nested-json-result) — Burak Cakir, Sep 29 '16 at 08:40
@Suresh Basnet : Check the below answer with complete parsing for your json response — Jai, Sep 29 '16 at 08:52
@jai I have copied my response string and each time it shows the values form the response string not from the server. we cannot directly set Name,Id and Category for mCategory. It should first set the array with dynamic key. — Suresh Basnet, Sep 30 '16 at 05:54
@Jai thanks.. forgot to replace the callback with responseBody — Suresh Basnet, Sep 30 '16 at 07:10

Jai · Accepted Answer · 2016-09-29T08:51:35.860

Use JSONObject keys() to get the key and then you could iterate each key to get the dynamic values :

    JSONObject object = new JSONObject("your response string")
    Iterator keys = object.keys();

    //Let's consider your POJO class is CategoryClass
    // Let's take HashMap to store your POJO class for specific KEY
    HashMap<String, ArrayList<CategoryClass>> mMap = new HashMap<String, ArrayList<CategoryClass>>();

    while(keys.hasNext()) {
        // here you will get dynamic keys
        String dynamicKey = (String)keys.next();

        // get the value of the dynamic key
        JSONArray dynamicValue = object.getJSONArray(currentDynamicKey);

        //Let's store into POJO Class and Prepare HashMap.
         ArrayList<CategoryClass> mCategoryList = new ArrayList<CategoryClass>();
         for(int i = 0 ; i < dynamicValue.length(); i++){

             CategoryClass mCategory = new CategoryClass();
             mCategory.setName(dynamicValue.getString("name"));
             mCategory.setId(dynamicValue.getString("id"));
             mCategory.setCategory(dynamicValue.getString("category"));

             mCategoryList.add(mCategory);


         }
        //Add Into Hashmap
        mMap.put(dynamicKey, mCategoryList);

    }

score 1 · Answer 2 · answered Sep 29 '16 at 10:50

1

From my point of view,this format is not recommended.The date should be value such as "date":"2016-10-01" instead of json key.

answered Sep 29 '16 at 10:50

Qian Sijianhao

564
7
19

It is not really an answer to the question, but it is a damn valid point! A key should not be dynamic – WarrenFaith Dec 07 '16 at 10:55

how to create a pojo class with dynamic key for arrayname

2 Answers2