Count number of Strings and JSONObjects in JSONArray

Question

I am trying to parse a JSON schema and I need to get all the image links from the JSONArray and store it in a java array. The JSONArray looks like this:

enter image description here

How can I get only the number of strings in the image array for e.g. In this case it should be 4? I know how to get the full length of array but how can I only get the number of strings?

UPDATE:

I am simply parsing it using the standard JSON parser for android. The length of JSONArray can be calculated using:

JSONArray imageArray = hist.getJSONArray("image");
int len = imageArray.length();

len will be equal to 9 in this case.

What JSON parser are you using? Can you clarify what you mean when you say I know how to get the full length of array but how can I only get the number of strings? — mittmemo
– mittmemo, Commented Jun 25, 2015 at 23:36

mittmemo · Accepted Answer · 2015-06-26 00:43:06Z

3

I'm not sure if there's a better way (there probably is), but here's one option:

According to the Android docs, getJSONObject will throw a JSONException if the element at the specified index is not a JSON object. So, you can try to get the element at each index using getJSONObject. If it throws a JSONException, then you know it's not a JSON object. You can then try and get the element using getString. Here's a crude example:

JSONArray imageArray = hist.getJSONArray("image");
int len = imageArray.length();
ArrayList<String> imageLinks = new ArrayList<String>();
for (int i = 0; i < len; i++) {
    boolean isObject = false;
    try {
        JSONArray obj = imageArray.getJSONObject(i);
        // obj is a JSON object
        isObject = true;
    } catch (JSONException ex) {
        // ignore
    }
    if (!isObject ) {
        // Element at index i was not a JSON object, might be a String
        try {
            String strVal = imageArray.getString(i);
            imageLinks.add(strVal);
        } catch (JSONException ex) {
            // ignore
        }
    }
}
int numImageLinks = imageLinks.size();

edited Jun 26, 2015 at 0:43

answered Jun 26, 2015 at 0:00

mittmemo

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1 Comment

newbie Over a year ago

You interpreted it wrong, there is no subArray. There is only 1 array image which contains few strings and few JSONObjects. I can get total number of elements in a JSONArray using imageArray.length(); but if I had to get only the number of strings then how can I get that number?

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