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How do I convert a JSON string to a JSON object?

I have problem with converting json string to Json Object
I Receive this Json Result from my server :
{"type":"news","items":[{"id": "867","title": "مخيّم_بساط_الرّيح - مخيّم_كان_ياما_كان","content": " في المركز الجماهيري ابوسنان ..  اليوم الخامس على التوالي .. ","fromDate": false,"toDate": false,"image": "productImages2/105/2017/07/13/image1499940076.jpg","imageAlt": "مخيّم_بساط_الرّيح - مخيّم_كان_ياما_كان","exLink":"http://www.mas.org.il/page.php?type=page&id=2477&ht=#navbar","price": false}]}
and I want to put the result into list view
I have tried many methods which eventually failed

simply you can take that received string as string and then convert it
String json ={"type":"news","items":[{"id": "867","title": "مخيّم_بساط_الرّيح - مخيّم_كان_ياما_كان","content": " في المركز الجماهيري ابوسنان .. اليوم الخامس على التوالي .. ","fromDate": false,"toDate": false,"image": "productImages2/105/2017/07/13/image1499940076.jpg","imageAlt": "مخيّم_بساط_الرّيح - مخيّم_كان_ياما_كان","exLink":"http://www.mas.org.il/page.php?type=page&id=2477&ht=#navbar","price": false}]}
and now convert in json object
JSONObject jsonObj = new JSONObject(json);
now you can use it as jsonobject

Try this
JSONObject jsonObj = new JSONObject(json);
JSONArray jsonArry = jsonObj.getJSONArray("items");
JSONObject jsonObj1 = jsonArry.getJSONObject(0);
String id = jsonObj1.getString("id");
String title= jsonObj1.getString("title");
..
..
..
String price = jsonObj1.getString("price");

How to parse JSON structured-JSON Array Object in Java

i'm trying to parse this JSON code
{
"resultCode":"350",
"message":"OK",
"result":1,
"data":
{
"totalCount":"2",
"videos":[
{
"videoId":"73bfedf534",
"VideoUrl":"www.videourlexample.com",
"title":"vbsample1",
"description":""
},
{
"videoId":"73bfedf534",
"VideoUrl":"www.videourlexample.com",
"title":"vbsample2",
"description":""
}
]
}
}
I was able to parse only this.
"resultCode":"350",
"message":"OK",
"result":1,
this is the java code
JSONObject jsonObject = (JSONObject)
//return the JSON code above.
jsonParser.parse(getHTML("...httpRequest..."));
// get a String from the JSON object
String resultCode = (String) jsonObject.get("resultCode");
System.out.println("[RESULTCODE] The message is: " + resultCode);
// get a String from the JSON object
String message = (String) jsonObject.get("message");
System.out.println("[MESSAGE] The message is: " + message);
// get a number from the JSON object
long result = (long) jsonObject.get("result");
System.out.println("[RESULT] The resultCode is: " + result);
I can't parse the "data". Someone can help me?
I would like to take each value from the json array separately... like resultCode, message and result.
Thank you.

JSONObject mainObj= new JSONObject(yourJSON);
String resultCode= mainObj.get("resultCode");
String message= mainObj.get("message");
String result= mainObj.get("result");
JSONObject dataObj = mainObj.get("data");
JSONArray jsonArray = (JSONArray) dataObj.get("videos");
for (int i = 0; i <jsonArray.length(); i++) {
JSONObject obj= jsonArray.get(i);
String videoId=obj.get("videoId");
String videoUrl=obj.get("VideoUrl");
String title=obj.get("title");
String description=obj.get("description");
System.out.println("videoId="+videoId +"videoUrl="+videoUrl+"title=title"+"description="+description);
}
System.out.println("resultCode"+resultCode+"message"+message+"result"+result);

You can try using this:-
JSONObject dataObj = (JSONObject)dataObj .get("data");
JSONArray jsonArray = (JSONArray) dataObj.get("videos");
for (int i = 0; i <jsonArray.length(); i++) {
System.out.println(((JSONObject)jsonArray.get(i)).get("videoUrl"));
}
Currently I have just printes videoUrl, you can similarly get other attributes for videos.

for data use:
int totalCount = (int) ((Map) jsonObject.get("data")).get("totalCount");
JSONArray videos = (JSONArray) jsonObject.get("data")).get("videos");
and then parse videos JSONArray.

Android json parsing without array name

I have a Json Array as string without name and I want to parse it how can i do it in android ?
My array :
{"emp_info":[
{"id":"1","groupe":"1","professeur":"1"},
{"id":"2","groupe":"2","professeur":"1"}
]}

This is how you can parse it
Assuming your json string is data
JSONObject jsonObj = new JSONObject(data);
JSONArray empInfo = jsonObj.getJSONArray("emp_info");
for(int i = 0; i < empInfo.length(); i++){
JSONObject obj = empInfo.getJSONObject(i);
String id = obj.getString("id");
String groupe = obj.getString("groupe");
String professeur = obj.getString("professeur");
}

The example json you gave has a name, but if it doesn't this is how I do it. Using Gson to parse JSON, I use TypeToken to tell the gson builder it's an array.
List<MyObject> jsonObject = new Gson().fromJson(json, new TypeToken<List<MyObject>>().getType());
With the following code you'll have an object representation of your json array.

how to parse a JSON string which is inside a array

I have a json of following format:
{
"Result": {
"question": "Barack Obama vs Mitt Romney?",
"option": [
"Barack Obama",
"Mitt Romney",
"Other"
],
"percentage": [
20,
40,
80
]
}
}
and I am using following code to parse it but this giving null pointer exception at option array.
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONObjectFromUrl(url);
Log.e("json",json.toString());
Log.e("-------url-------", ""+url);
String resultStr = json.getString("Result");
Log.e("result string ",resultStr);
JSONObject jsonObject2 = new JSONObject(resultStr);
String question_string = jsonObject2.getString("question");
Log.e("question String ",question_string);
String option_str = jsonObject2.getString("option");
JSONArray optionArray = new JSONArray(option_str);
Log.d("option array", String.valueOf(optionArray.length()));

You need to get the json array this way:
JSONArray optionArray = jsonObject2.getJSONArray("option");
Log.d("option array", String.valueOf(optionArray.length()));
check http://www.androidhive.info/2012/01/android-json-parsing-tutorial/

Use:
JSONArray optionArray = jsonObject2.getJSONArray("option");
as "option" key points to an array and not to a String.

You're going way too complicated here, and not using those lovely GetJSONObject and getJSONArray functions, which will cause you to double parse a lot. Try this
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONObjectFromUrl(url);
Log.e("json",json.toString());
Log.e("-------url-------", ""+url);
JSONObject jsonObject2 = json.getJSONObject("Result");
String question_string = jsonObject2.getString("question");
Log.e("question String ",question_string);
JSONArray optionArray = jsonObject2.getJSONArray("option");

Instead of using
String option_str = jsonObject2.getString("option");
use this :
JSONARRAY optionArray = jsonObject2.getJSONAray("option");
for(int i=0;i<optionArray.length; i++){
String option = optionArray[i].getString();}
Try this..

Parsing String to JsonObject using GSON gives IllegalStateException: This is not a JSON Object

I have the following code:
JsonParser parser = new JsonParser();
System.out.println("gson.toJson: " + gson.toJson(roomList));
JsonObject json2 = parser.parse("{\"b\":\"c\"}").getAsJsonObject();
System.out.println("json2: " + json2);
JsonObject json = parser.parse(gson.toJson(roomList)).getAsJsonObject();
System.out.println("json: " + json);
It gives me the following output:
gson.toJson: [{"id":"8a3d16bb328c9ba201328c9ba5db0000","roomID":9411,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328b9f3a01328b9f3bb80000","roomID":1309,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328ba09101328ba09edd0000","roomID":1304,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bb8af640000","roomID":4383,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd271fe0001","roomID":5000,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd2e0e30002","roomID":2485,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd3087b0003","roomID":6175,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd35a840004","roomID":3750,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd366250005","roomID":370,"numberOfUsers":4,"roomType":"BigTwo"},{"id":"402881e4328bb83601328bd3807d0006","roomID":9477,"numberOfUsers":4,"roomType":"BigTwo"}]
json2: {"b":"c"}
java.lang.IllegalStateException: This is not a JSON Object.
Can someone please help me parse my Json string to JsonObject? I have checked in http://jsonlint.com/ that my json is valid though.

It's because due to the JSON structure..
I have to put it into a JSONObject first, like so
JsonObject jsonObj = new JsonObject();
jsonObj.addProperty(ServerConstants.JSONoutput, gson.toJson(roomList));
Then I would deserialize like
List<RoomData> roomList = gson.fromJson(jsonObj.get(CardGameConstants.JSONoutput).toString(), listType);
for (RoomData roomData : roomList) {
System.out.println(roomData.getRoomID());
}

This should give you some basic idea.
ArrayList<String> roomTypes = new ArrayList<String>();
JSONArray jsonArray = new JSONArray(jsonString);
for(int i =0; i<jsonArray.length(); i++){
roomTypes.add(jsonArray.getJSONObject(i).getString("roomType"));
}

The problem with the code is that roomList is not a JsonObject as evident in the printed output. It's actually a JsonArray.
To fix the code, call .getAsJsonArray() (instead of .getAsJsonObject())
JsonParser parser = new JsonParser();
System.out.println("gson.toJson: " + gson.toJson(roomList));
JsonObject json2 = parser.parse("{\"b\":\"c\"}").getAsJsonObject();
System.out.println("json2: " + json2);
JsonArray json = parser.parse(gson.toJson(roomList)).getAsJsonArray();
System.out.println("json: " + json);