Getting JSONException

I have a json object:

"images":{"1":{"imagename":"image1.gif","url":"image1url"},"2":{"imagename":"image2.gif","url":"image2url"},"3":{"imagename":"image3.gif","url":"image3url"}}

I want to fetch imagename and url from this. I enter into this images. I fetched the values 1,2,3 from images. But I am not able to fetch the json corresponding to this 1,2 and 3.

Its throwing exception stating: No value for 1 or No Value for 2 or No value for 3

What may be the reason for this cause? Please reply..

My present code is:

if(jsonObj.has("images")) {

    JSONArray imagesArray = jsonObj.getJSONOb开发者_开发技巧ject("images").names();
    JSONObject imageDetailsObject;

    for(int i = 0; i < imagesArray.length(); i++) {
       imageDetailsObject = jsonObj.getJSONObject(imagesArray.get(i).toString());
       if(imageDetailsObject.has("imagename")) {
          //perform some actions
       }
       if(imageDetailsObject.has("url")) {
         //perform some actions
       }
    }
}

EDITED:

imageDetailsObject = jsonObj.getJSONObject("images").getJSONObject(imagesArray.get(i).toString());

I got it worked by giving:

if (jsonObj.has("images")) {

    JSONArray imagesArray = jsonObj.getJSONObject("images").names();
    JSONObject imageDetailsObject;

    for (int i = 0; i < imagesArray.length(); i++) {

        imageDetailsObject = jsonObj.getJSONObject("images").getJSONObject(
                                        imagesArray.getString(i));
        if(imageDetailsObject.has("imagename")) {
            //perform some actions
        }
        if (imageDetailsObject.has("url")) {
            //perform some actions
        }
    }                           
}