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I need to be able to create a new JSONArray from the one I already have, in the array I have a whole lot of fields called id, another one on each line, how do I get a list of them?

eg. I get this back 

[{"id":111,"users":"blob"},
 {"id":111,"users":"blob"},
 {"id":111,"users":"blob"},
 {"id":111,"users":"blob"},
 {"id":111,"users":"blob"},
 {"id":111,"users":"blob"}]

How would I get a list of just the ID's ?

  • Edit

Decided to use a for loop straight after this but thanks :D

HttpResponse response = httpclient.execute(httpget); //execute the HttpPost request
JSONArray jsa =  projectResponse(response); //get the json response

for(int i = 0; i < jsa.length(); i++){
    JSONObject jso = jsa.getJSONObject(i);
    publishProgress(jso.getString("id"), jso.getString("name"));
}
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what's wrong building a new JSONArray with a good 'ol fashioned for loop? – Travis Webb Apr 19 '12 at 2:23
See this post. This will help you. stackoverflow.com/questions/2487841/… – Akilan Apr 19 '12 at 2:25

1 Answer

up vote 1 down vote accepted

Try this out:

JSONArray yourJSONArray;
List<String> tempIDStringCollection = new List<String>();
...

for(int i = 0; i < yourJSONArray.length(); i++){
        String id = yourJSONArray.getJSONObject(i).getString("id");
        tempIDStringCollection.add(id);
}

Then to transfer this into another JSONArray, try:

JSONArray newArray = new JSONArray(tempIDStringCollection);

To skip the List creation, try

JSONArray yourJSONArray;
JSONArray newArray = new JSONArray();
...

for(int i = 0; i < yourJSONArray.length(); i++){
        String id = yourJSONArray.getJSONObject(i).getString("id");
        newArray.put(i, id);
}
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