How to convert HashMap to json Array in android?

Question

I want to convert HashMap to json array my code is as follow:

Map map = new HashMap();

map.put(         


        

Answer 1

A map consists of key / value pairs, i.e. two objects for each entry, whereas a list only has a single object for each entry. What you can do is to extract all Map.Entry and then put them in the array:

Set entries = map.entrySet();
JSONArray mJSONArray = new JSONArray(entries);

Alternatively, sometimes it is useful to extract the keys or the values to a collection:

Set keys = map.keySet();
JSONArray mJSONArray = new JSONArray(keys);

or

List values = map.values();
JSONArray mJSONArray = new JSONArray(values);

Note: If you choose to use the keys as entries, the order is not guaranteed (the keySet() method returns a Set). That is because the Map interface does not specify any order (unless the Map happens to be a SortedMap).