Android creates Json String

Question

I am trying to create a JSON string in an Android application.

JSONArray jArrayFacebookData = new JSONArray(); JSONObject jObjectType = new JSONObject(); // put elements into the object as a key-value pair jObjectType.put("type", "facebook_login"); jArrayFacebookData.put(jObjectType); // 2nd array for user information JSONObject jObjectData = new JSONObject(); // Create Json Object using Facebook Data jObjectData.put("facebook_user_id", id); jObjectData.put("first_name", first_name); jObjectData.put("last_name", last_name); jObjectData.put("email", email); jObjectData.put("username", username); jObjectData.put("birthday", birthday); jObjectData.put("gender", gender); jObjectData.put("location", place); jObjectData.put("display_photo", display_photo_url); jArrayFacebookData.put(jObjectData); 

What creates a line like

 [ { "type":"facebook_login" }, { "birthday":"06\/22\/1986", "first_name":"Harsha", "username":"harshamv", "location":"Bangalore, India", "email":" [e-mail] ", "last_name":"Mv", "gender":"male", "facebook_user_id":"1423671254", "display_photo":"http:\/\/graph.facebook.com\/1423671254\/picture?type=large" } ] 

I want to create a JSON string something like this

 [ "system":{ "type":"facebook_login" }, "data":{ "birthday":"06\/22\/1986", "first_name":"Harsha", "username":"harshamv", "location":"Bangalore, India", "email":" [e-mail] ", "last_name":"Mv", "gender":"male", "facebook_user_id":"1423671254", "display_photo":"http:\/\/graph.facebook.com\/1423671254\/picture?type=large" } ] 

Answer 1

 JSONObject jArrayFacebookData = new JSONObject(); JSONObject jObjectType = new JSONObject(); // put elements into the object as a key-value pair jObjectType.put("type", "facebook_login"); jArrayFacebookData.put("system", jObjectType); // 2nd array for user information JSONObject jObjectData = new JSONObject(); // Create Json Object using Facebook Data jObjectData.put("facebook_user_id", id); jObjectData.put("first_name", first_name); jObjectData.put("last_name", last_name); jObjectData.put("email", email); jObjectData.put("username", username); jObjectData.put("birthday", birthday); jObjectData.put("gender", gender); jObjectData.put("location", place); jObjectData.put("display_photo", display_photo_url); jArrayFacebookData.put("data", jObjectData); 

this will give you jsonObject, but not an array, I see no reason to use JSONArray. In this case, JSONObject is better. you will see the following result as String

 { "system":{ "type":"facebook_login" }, "data":{ "birthday":"06\/22\/1986", "first_name":"Harsha", "username":"harshamv", "location":"Bangalore, India", "email":" [e-mail] ", "last_name":"Mv", "gender":"male", "facebook_user_id":"1423671254", "display_photo":"http:\/\/graph.facebook.com\/1423671254\/picture?type=large" } } 

Answer 2

Create JSON objects for the jArrayFacebookData (and not JSONArray as you did) and put jObjectType and jObjectData strong> in it.

Check this JSONObject put object method .

Update:

Your JSON has an error:

Valid JSON:

 { "system": { "type": "facebook_login" }, "data": { "birthday": "06/22/1986", "first_name": "Harsha", "username": "harshamv", "location": "Bangalore, India", "email": " [e-mail] ", "last_name": "Mv", "gender": "male", "facebook_user_id": "1423671254", "display_photo": "http://graph.facebook.com/1423671254/picture?type=large" } } 

Final decision:

  try { JSONObject jArrayFacebookData = new JSONObject(); JSONObject jObjectType = new JSONObject(); jObjectType.put("type", "facebook_login"); JSONObject jObjectData = new JSONObject(); jObjectData.put("facebook_user_id", "2323"); jObjectData.put("first_name", "2323"); jObjectData.put("last_name", "2323"); //put other data here jArrayFacebookData.put("system", jObjectType); jArrayFacebookData.put("data",jObjectData); System.out.println("==========> Final output => "+jArrayFacebookData.toString()); } catch(Exception e) { } 

Answer 3

as I write json string.

 for(int i=0; i<iArr.size(); i++){ if(i==0){ st = "{\"userId\":" + iArr.get(i) + "}"; str += st; }else if(i>0 && i<iArr.size()-1){ st = ",{\"userId\":" + iArr.get(i) + "}"; str+=st; }else if(i==iArr.size()){ st = ",{\"userId\":" + iArr.get(i) + "}]}"; str+=st; } } String myPost = "{\"project\":{\"Name\":"+ "\""+ title + "\"" + ",\"Description\":" + "\""+ desc + "\"" + ",\"createdBy\":" + usrid + "" + ",\"startDate\":" + "\""+ startdate + "\"" + ",\"dueDate\":" + "\""+ duedate + "\"" + ",\"projectLeadId\":" + leadPosition + "" + ",\"QAId\":" + QAssurencePosition + "" + ",\"TotalHour\":" +"\""+ edtHour + "\""+ "},\"members\":["; myPost += str; myPost +="]}"; RequestPackage myPackage = new RequestPackage(); myPackage.setUri(getaddProject); myPackage.setMethod("POST"); myPackage.setParam("My Post",myPost+""); new MyTask().execute(myPackage); Toast.makeText(CreateProject.this,"Testing String: " + myPost,Toast.LENGTH_LONG ).show(); Log.d("My Post :",myPost); }