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How to get array number JSON android

I have JSON :
{"elements":[{"id":5,"name":"Mathematics","shortName":"math","links":{"courses":[15,30,46,47]}}]}
My code :
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
//Log.d("All Products: ", json.toString());
try {
products = json.getJSONArray("elements");
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
int ids = c.getInt(TAG_PID);
String id = String.valueOf(ids);
if (id.compareTo(id_kh) == 0) {
object = c.getJSONObject("links");
JSONArray courses = object.getJSONArray("courses");///???????????
//result = courses.split("[,]");
Toast.makeText(getBaseContext(),"abc",Toast.LENGTH_LONG).show();
break;
}
}
} catch (JSONException e) {
e.printStackTrace();
}
I dont know to get array number after "courses".

I would use HashMaps. Here you have an example (creating Hashmap from a JSON String
) how to get it from a JSON String.
Particularly for the "courses", once you have been parsed until there, I would use a HashMap<String,List<Integer>>

courses is a JSONArray, so you can do like that:
JSONArray coursesArray = linksObject.getJSONArray("courses");
UPDATE:
To get values from coursesArray :
int value = coursesArray.optInt(position);

Almost there. Once you get your
JSONArray courses = object.getJSONArray("courses");
simply iterate over its values:
// you wanted these numbers in an array
// so let's create one, with size being number of elements in
// JSONArray courses
int[] courseIds = new int[courses.length()];
for (int j=0; j<courses.length(); j++) {
// assign current number to the appropriate element in your array of ints
coursesId[j] = courses.getInt(j);
Log.d("TAG", "number: " + number);
}
The above will save these numbers in an array and print them too:
number: 15
number: 30
number: 46
number: 47
Just keep in mind that "courses" key might not exist, the array might be empty etc.

How to parse json response in android which is of the following format

I am trying to parse a json response in android for my android application. I am getting org.json.JSONException. The response is as shown below:
{
id: "12345"
email:"abc#gmail.com"
firstName:"abcd"
lastName:"efgh"
userName:"abc123"
}
I am trying to parse the response as shown below:
if (response != null) {
try {
//JSONObject jsonObj = new JSONObject(text);
// Getting JSON Array node
JSONArray contacts = new JSONArray(response.toString());
// looping through All Contacts
for (int i = 0; i < contacts.length(); i++) {
JSONObject c = contacts.getJSONObject(i);
id = c.getString("_id");
email = c.getString("email");
firstName = c.getString("firstName");
lastName = c.getString("lastName");
userName = c.getString("userName");
}
} catch (JSONException e) {
e.printStackTrace();
}
Can any one let me know what mistake am I doing in parsing the response. All suggestions are welcome.

Simply replace this you are using "_id" instead of "id"
id = c.getString("id");
email = c.getString("email");
firstName = c.getString("firstName");
lastName = c.getString("lastName");
userName = c.getString("userName");

Change this id = c.getString("_id"); to id = c.getString("id");
in the future, you may show error in logcat when parsing like this:
catch (JSONException e) {
e.printStackTrace();
Log.e("TAG", e.getMessage());
}

There are two things I can think of , first of all you should get to know that what are [] , {} . The square brackets are arrays in json and curly demonstrate the object , so I think you are casting it wrong
1>
JSONArray contacts = new JSONArray(response.toString()); "this is culprit"
You should change it to
JSONObject. Use JSONObject in place of JSONArray
and Secondly
2> change this key id = c.getString("_id");to
id = c.getString("id");
Make sure You are getting and writing spellings of all keys right else it would generate exception.

data from a jsonobject in android

The below is called from a string url and returns a json object which has an json array inside, but something else is not working, can anyone show me how to access the data inside?
{"data":[{"8196":{"booking_id":"8150","client_id":"107","venue_id":null}}]

String jsonStr = "{\"data\":[{\"8196\":{\"booking_id\": \"8150\",\"client_id\": \"107\",\"venue_id\": null}}]}";
try {
JSONObject json = new JSONObject(jsonStr);
JSONArray array = json.getJSONArray("data");
for (int i = 0; i < array.length(); i++) {
JSONObject o = array.getJSONObject(i);
Iterator it = o.keys();
while (it.hasNext()) {
String name = (String) it.next();
o = o.getJSONObject(name);
int bookingId = o.getInt("booking_id");
int clientId = o.getInt("client_id");
int venueId = o.optInt("venue_id");
Log.v("TEST", String.format("Booking ID: %s -- Client ID: %s -- Venue ID: %s", bookingId, clientId, venueId));
}
}
} catch (JSONException e) {
e.printStackTrace();
}
I guess this is what you'll want. By the way, the JSON you posted is malformed. It's missing a } in the end.

You first need to decode the JSON string. The JSON sting you got in return is actually a serialized version of a JSON object.
You need to decode that string into a native Java Object.
There are a number of methods to this in Java. You can start by checking out the Java section at json.org.

I think the problem is that the value of key venue_id is null. You can replace null value with empty string(""), try it.

JSON parsing returning a null value

I am trying to parse the response i get from the network database. I am getting only one value i.e. seller id in response. When i try to pass it in JSON Object, somehow the toast after it doesn't execute and the toast after it is not executed.
I know there are many related questions but i can't find whats wrong... please help. Thanks.
try {
JSONArray jArray = new JSONArray(stuff.toString());
Toast.makeText(this, "len: " + jArray.length(), 1000).show(); // length is 1
for (int i = 0; i < jArray.length(); i++) {
Toast.makeText(this, "Arr: " + stuff, 1000).show();
// Arr: [{"seller_id":"5"}]
JSONObject jObject = jArray.getJSONObject(i);
j_id = jObject.getString(stuff);
// not getting executed
Toast.makeText(this, "JSON: " + j_id, 1000).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
Toast.makeText(this, "View: " + j_id, 1000).show(); // j_id is giving null value
This is my json data [{"seller_id":"5"}] i am trying to get the value of seller id (ie 5 here) out of it.

There is a problem in jObject.getString() method args
JSONObject jObject = jArray.getJSONObject(i);
j_id = jObject.getString(stuff);
Your giving the array. It should the name of the object i.e seller_id
so after the modification your code would be j_id = jObject.getString("seller_id");

After the following code:
j_id = jObject.getString(stuff);
add textview.settext(j_id);
and change this textview with your textview name
and if its not working than show your complete json data.

Json Without Key to Parse in Android

I have this below Json which I'm getting from a .Net Web service:
[["Developer","test","developer#test.com"]]
I checked with jsonlint validator and It shows above json fine.
Because it is not having any key I don't know how to parse it in Android.
Can someone please help me how to parse this json without key.
If it had keys, I would have tried this:
{"first":"somevalue","last":"someothervalue"} // Json response
JSONObject json_obj = new JSONObject(resp); //response is the json array
String first = json_obj.getString("first");
String last = json_obj.getString("last");
String test = "Hello! " + first + " " + last;
Hope someone helps :)
Regards,
Praveen
MY SOLUTION
JSONArray respo = new JSONArray(resp); //resp is Json Array
respo = respo.getJSONArray(0);
String test = respo.getString(2);
test = "Your Email Address is " + test;

in Android (Java) parsing this line looks like:
String jsonString="[[\"Developer\",\"test\",\"developer#test.com\"]]";
try {
JSONArray jsonArray=new JSONArray(jsonString);
JSONArray jsonArray2=jsonArray.getJSONArray(0);
for (int i = 0; i < jsonArray2.length(); i++) {
String valueString=jsonArray2.getString(i);
Log.e("json", i+"="+valueString);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Use JSONArray instead of JSONObject. Then use the getJSONArray() function to get the array inside the array. After that you can access all values with their index and getString().