Convert JSON key value pairs into JSON Array Android

Question

I have an array of key-value pairs like this:

{
  "320x240":"http:\/\/static.example.com\/media\/content\/2012\/Jul\/mercedes-benz-a-klasse-red-t_320x240.jpg",
  "300x225":"http:\/\/static.zigwheels.com\/media\/content\/2012\/Jul\/mercedes-benz-a-klasse-red-t_300x225.jpg",
  "200x150":"http:\/\/static.zigwheels.com\/media\/content\/2012\/Jul\/mercedes-benz-a-klasse-red-t_200x150.jpg"
}

What I'm doing currently is this:

   try {

      images_object = new JSONObject(imageList);//imageList is a String of the above array //of key value pairs

            Iterator<?> keys = images_object.keys();
            String string_images = "";
           if(keys.hasNext()) {
               String key = (String)keys.next();
                String value = (String)images_object.get(key);
                string_images = "[" + value;  
           }
            while( keys.hasNext() ){
                String key = (String)keys.next();
                String value = (String)images_object.get(key);
                string_images = string_images + "," + value;

            }
            string_images = string_images + "]";
            String encoded_json_string = JSONObject.quote(string_images);
            images = new JSONArray(encoded_json_string);//images is of type JSONArray but it is null
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

But, images, is NULL. Why's that? What am I missing?

Because you're not creating valid JSON. string_images will in no way resemble valid JSON which requires strings to be quoted. — Brian Roach
– Brian Roach, Commented May 9, 2013 at 5:28
Could you tell me what is wrong? I also tried removing the square brackets. — Namratha
– Namratha, Commented May 9, 2013 at 5:31
@Namratha What is your problem with the below answer? Have you tried that? — Pragnani Kinnera
– Pragnani Kinnera, Commented May 9, 2013 at 7:07

Raptor · Accepted Answer · 2014-01-20 07:06:27Z

4

you can get all values from current JSONObject in JSONArray as:

Iterator<String> keys = images_object.keys();
JSONArray images = new JSONArray();
while( keys.hasNext() ){
    String key = keys.next();
    String value = images_object.optString(key);
    //add value to JSONArray from JSONObject
    images.put(value);
}

EDIT

Simplified solution is get the keys with images_object.names() and you can pass JSONArray of keys to toJSONArray method to get the value with respect to keys in JSONArray

JSONArray keys=images_object.names();
JSONArray values=images_object.toJSONArray(keys);

To Summing up simplified solution is:

JSONArray images=images_object.toJSONArray(images_object.names());

edited Jan 20, 2014 at 7:06

Raptor

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answered May 9, 2013 at 5:31

ρяσѕρєя K

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13 Comments

Namratha Over a year ago

The method add(String) is undefined for the type JSONArray.

ρяσѕρєя K Over a year ago

@Namratha : then you can use JSONArray.put . see my edit answer

ρяσѕρєя K Over a year ago

@Pragnani : hi, but i think requirement is to get value associated with name or keys in JSONArray

Pragnani Kinnera Over a year ago

@ρяσѕρєяK Please include above comment in answer so that it will help others..It will do the things in one line

Pragnani Kinnera Over a year ago

@ρяσѕρєяK Above solution will give values in JSONArray format not keys

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