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.

Answer 1

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);

    }