create an array of all the keys in a JSONObject Android

Question

Hi im wanting to create an array of all the keys in a JSONObject. my understanding (please correct me if i\'m wrong) is that i need to convert the JSONObject to a Map and th

Answer 1

Use the [keys()][1] iterator to iterate over all the properties, and call [get()][2] for each.

Iterator<String> iter = json.keys();
while (iter.hasNext()) {
    String key = iter.next();
    try {
        Object value = json.get(key);
    } catch (JSONException e) {
        // Something went wrong!
    }
}

Answer 2

No need to convert JSONObject to a Map and then create an Array of keys just use JSONObject.names() for getting all keys in an JsonArray then convert it to Array or ArrayList. example:

JSONObject  json = new JSONObject("json object string");
JSONArray namearray=json.names();  //<<< get all keys in JSONArray

Answer 3

Try this:

ArrayList<String> list = new ArrayList<String>();     
JSONArray jsonArray = (JSONArray)jsonObject; 
if (jsonArray != null) { 
   int len = jsonArray.length();
   for (int i=0;i<len;i++){ 
    list.add(jsonArray.get(i).toString());
   } 
} 

String[] array = list.toArray(new String[list.size()]);