JSON array parsing in android

Question

Here is my JSON object and i want to parse it in android project

{
 "second": {
 "versionInfo": "0.20.3-dev",
 "compileDate": "Mon Mar 12 17:39:23 IST 2012",
 "compileUser": "suraj",
 "trackname": "tracker_localhost:localhost/127.0.0.1:48418"
 },
 "href": {
 "versionInfo": "null",
 "compileDate": "null",
 "compileUser": "null",
 "trackname": "null"
 },
 "first": {
 "key": "['trackname','versionInfo','compileDate','compileUser']"
 }
}

How to compile? i want to first extract attributes of 'first' and using the attributes and then to extract parameters of 'second' using attributes of 'first'.

• assylias: Have you considered using a JSON parser: stackoverflow.com/questions/338586/a-better-java-json-library
• HJW: Also, you can make use of GSON to parse this JSON String into Java object types and manipulate it. java.sg/parsing-a-json-string-into-an-object-with-gson-easily
• waqaslam: the best way would be to use Gson and let it do automatically for you.
• Yaqub Ahmad: stackoverflow.com/questions/9441932/…

Answer 1

Basically it is done like that:

JSONObject jobj = new JSONObject(theString);
JSONObject first = jobj.getJSONObject("first");
JSONObject second = jobj.getJSONObject("second");

If you want more, take a look at the documentation of JSON classes for android.

Edit

Regarding the extraction of the array (in first->key):

String jStr = first.getString("key");
JSONArray jArr = new JSONArray(jStr);

• user1264099: thanks....but how to get values from key 'key' in 'first' object....as there is only one key and value is array of attributes?
• MByD: one at a time :). The value of "key" is NOT an array but a String (that contains a serialized JSON array). I will edit in a few minutes, but if you read the documentation it'll be easier for you in the future.
• user1264099: thank you very much....actually i am new to json and android thats why i dont know the exact concept.........anyway i will keep in mind your suggestion..and again thanks for help :)