Android create a Json String

Question

I am trying to create a JSON String in the 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);

Which creates a string like this

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

Yashwanth Kumar · Accepted Answer · 2011-11-10 12:12:09Z

20

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 array, i don't see any point in using JSONArray. JSONObject is better in this case. you will see following output as String

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

answered Nov 10, 2011 at 12:12

Yashwanth Kumar

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3 Comments

Yashwanth Kumar Over a year ago

do you mean to say you can't put jsonObject inside a json Object?

Paresh Mayani Over a year ago

Sorry my dear for my mistake. I haven't seen that you have taken jArrayFacebookData is of JSONObject, not of JsonArray.

Yashwanth Kumar Over a year ago

that is because, jsonArray cannot have key value as it's elements , that is why i suggested to use jsonObject

Paresh Mayani · Accepted Answer · 2011-11-10 12:45:44Z

Create JSON objects for the jArrayFacebookData (not JSONArray as you have taken) and put jObjectType and jObjectData inside it.

Check this JSONObject put object method.

Update:

Your JSON is having error:

enter image description here

Valid JSON is:

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

Final Solution:

     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)
  {

  }

Bazzinga... · Accepted Answer · 2016-07-20 11:45:07Z

how i post 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);
 }

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