To get all the keys in JSONObject into String array

Question

I want to create a json object from existing json object. For this i want to get all the keys in JSONObject to a String[] array. Is there any default method to get the keys into a String array. I found there exists a static method here getNames() but it's not working.

I can go over each key using iterator and can construct a keys String array but i want any default method if exists.

Could you provide a code snippet so we could understand what's wrong with the `getNames()` methos? — aga, Dec 06 '13 at 08:27
getNames() doesn't exist at all i get a error telling the method doesn't exist — kishore, Dec 06 '13 at 08:35
@kishore getNames() does exist, it depends on which library you are using. what are your imports? — Jhanvi, Dec 07 '13 at 11:59
org.json.JSONObject is the package i am using in my android application. — kishore, Dec 09 '13 at 05:18

score 12 · Answer 1 · answered Dec 06 '13 at 08:40

To construct JSONObject from other JSONObject you can use constructor that accept JSONObject and array of keys names that should be copied. To do it:

Iterator keysToCopyIterator = firstJSONObject.keys();
List<String> keysList = new ArrayList<String>();
while(keysToCopyIterator.hasNext()) {
    String key = (String) keysToCopyIterator.next();
    keysList.add(key);
}
String[] kesyArray = keysList.toArray(new String[keysList.size()]);
JSONObject secondJSONObject = new JSONObject(firstJSONObject, );

score 11 · Answer 2 · answered Sep 18 '14 at 18:29

11

There is not getNames(), but there is Names()

answered Sep 18 '14 at 18:29

Iriminage

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To get all the keys in JSONObject into String array

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