Json get JsonArray from JsonArray

Question

I have the following Json. link

I would like to get image_hall_list and image_place_list all url value.
I tried with the following code but no any result.

JSONObject JO = new JSONObject(result);
JSONArray ja = JO.getJSONArray("image_place_list"); //get the array

 for (int i = 0; i < ja.length(); i++) {
    JSONObject jo = null;
    try {
        jo = ja.getJSONObject(i);                    
        jsonurl.add(jo.getString("url"));
    } catch (JSONException e1) {
        e1.printStackTrace();
    }
}

nandsito · Accepted Answer · 2016-10-26 21:57:51Z

2

Try this:

JSONObject JO = new JSONObject(result);
JSONArray ja = JO.getJSONArray("place_list"); //get the array
for (int i = 0; i < ja.length(); i++) {
    JSONObject jo = null;
    try {
        jo = ja.getJSONObject(i);
        JSONArray imageHallList = jo.getJSONArray("image_hall_list");
        for (int j = 0; j < imageHallList.length(); j++) {
            JSONObject oneImageHallList = imageHallList.getJSONObject(j);
            jsonurl.add(oneImageHallList.getString("url"));
        }
        JSONArray imagePlaceList = jo.getJSONArray("image_place_list");
        for (int j = 0; j < imagePlaceList.length(); j++) {
            JSONObject oneImagePlaceList = imagePlaceList.getJSONObject(j);
            jsonurl.add(oneImagePlaceList.getString("url"));
        }
    } catch (JSONException e1) {
        e1.printStackTrace();
    }
}

answered Oct 26, 2016 at 21:57

nandsito

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Comments

OneCricketeer · Accepted Answer · 2016-10-26 22:10:27Z

I would recommend some methods.

One to extract all the URLs for a given object.

public ArrayList<String> getURLs(JSONObject jo, String key) throws JSONException {
    List<String> urls = new ArrayList<String>();
    JSONArray arr = jo.getJSONArray(key);
    for (int j = 0; j < arr.length(); j++) {
        JSONObject innerObj = arr.getJSONObject(j);
        urls.add(innerObj.getString("url"));
    }
    return urls;
}

Then, you can use that twice for the respective keys. You also need to first get "place_list" based if your result variable is directly from that link.

try {
    JSONObject jsonResponse = new JSONObject(result);
    JSONArray ja = jsonResponse.getJSONArray("place_list"); //get the array

     for (int i = 0; i < ja.length(); i++) {
        JSONObject jo = ja.getJSONObject(i);                    
        jsonurl.addAll(getURLs(jo, "image_hall_list"));
        jsonurl.addAll(getURLs(jo, "image_place_list"));
    }
} catch (JSONException e1) {
    e1.printStackTrace();
}

OneCricketeer · Accepted Answer · 2016-10-26 22:03:09Z

0

Use a nested for-loop. First grab the items before the image_hall_list and image_place_list, and then once you have the values stored, loop through image_hall_list, and image_place_list by getting that JSON object and loop through the elements in the JSON objects.

edited Oct 26, 2016 at 22:03

OneCricketeer

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answered Oct 26, 2016 at 21:44

hwhong

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