Parsing JSON api starting from an array - [

Parsing JSON api starting from an array - [

I am having trouble parsing my JSON API -

[     {        "Id":1,        "FirstName":"admin",        "LastName":"admin",        "Mobile":null,        "Email":"rajaish.rolen@gmail.com",        "UserName":"admin",        "password":"admin",        "RoleID":0,        "CreationDate":"2013-11-15T00:00:00",        "ModificationDate":"2013-11-15T00:00:00"     }  ]  

I've read some tutorials online, with a JSONParser class in which there is a getJSONFromURL method which returns JSONObject. But in all these tutorials their API starts from a JSON Object {, whereas mine starts from an array [. What changes do I need to make so that I can parse this api? Any other way of doing it? Please help me out, its been a head-scratcher for 3 days.

Here is my JSONParser class -

package com.example.projectfortab;  import java.io.BufferedReader;  import java.io.IOException;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.io.UnsupportedEncodingException;    import org.apache.http.HttpEntity;  import org.apache.http.HttpResponse;  import org.apache.http.client.ClientProtocolException;  import org.apache.http.client.methods.HttpPost;  import org.apache.http.impl.client.DefaultHttpClient;  import org.json.JSONArray;  import org.json.JSONException;  import org.json.JSONObject;    import android.util.Log;    public class JSONParser {      static InputStream is = null;      static JSONArray jObj = null;      static String json = "";        // constructor      public JSONParser() {      }        public JSONArray getJSONFromUrl(String url) {            // Making HTTP request          try {              // defaultHttpClient              DefaultHttpClient httpClient = new DefaultHttpClient();              HttpPost httpPost = new HttpPost(url);              httpPost.setHeader("Accept", "application/json");              httpPost.setHeader("Content-type", "application/json");                HttpResponse httpResponse = httpClient.execute(httpPost);              HttpEntity httpEntity = httpResponse.getEntity();              is = httpEntity.getContent();                       } catch (UnsupportedEncodingException e) {              e.printStackTrace();          } catch (ClientProtocolException e) {              e.printStackTrace();          } catch (IOException e) {              e.printStackTrace();          }            try {              BufferedReader reader = new BufferedReader(new InputStreamReader(                      is, "iso-8859-1"), 8);              StringBuilder sb = new StringBuilder();              String line = null;              while ((line = reader.readLine()) != null) {                  sb.append(line + "\n");              }              is.close();              json = sb.toString();          } catch (Exception e) {              Log.e("Buffer Error", "Error converting result " + e.toString());          }            // try parse the string to a JSON object          try {              jObj = new JSONArray(json);          } catch (JSONException e) {              Log.e("JSON Parser", "Error parsing data " + e.toString());          }            // return JSON String          return jObj;      }  }  

and here is what I am doing to parse it -

private static final String url = (Some url);                                 private static final String TAG_ID = "CreationDate";  private static final String TAG_FIRSTNAME = "password";  private static final String TAG_LASTNAME = "LastName";  String id;  JSONArray user = null; here      private class JSONParse extends AsyncTask {      private ProgressDialog pDialog;        @Override      protected JSONArray doInBackground(String... params) {      JSONParser jParser = new JSONParser();       JSONArray json = jParser.getJSONFromUrl(url);          System.out.println("LENGTH" + json.length());      try {          JSONObject json1 = json.getJSONObject(0);          if(json1.has(TAG_ID))              id = json1.getString(TAG_ID);          else              System.out.println("NO SUCH KEY");      } catch (JSONException e) {          e.printStackTrace();      }      Log.d("anush", "ID From JSON : " + id);      return json;  }  

when I tried this, logcat showing -

11-19 12:39:44.812: E/JSON Parser(29746): Error parsing data org.json.JSONException: Value {"ExceptionType":"System.NullReferenceException","Message":"An error has occurred.","StackTrace":"   at Lifestyle.Models.UserLoginRepository.Save(UserLogin item) in D:\\project\\LifestyleSolution2\\LifestyleSolution\\LifestyleSolution\\Lifestyle\\Models\\Repository\\UserLoginRepository.cs:line 83\r\n   at Lifestyle.Controllers.UserController.Post(UserLogin user) in D:\\project\\LifestyleSolution2\\LifestyleSolution\\LifestyleSolution\\Lifestyle\\Controllers\\UserController.cs:line 51","ExceptionMessage":"Object reference not set to an instance of an object."} of type org.json.JSONObject cannot be converted to JSONArray  

and

11-19 12:39:44.842: E/AndroidRuntime(29746): FATAL EXCEPTION: AsyncTask #1  11-19 12:39:44.842: E/AndroidRuntime(29746): java.lang.RuntimeException: An error occured while executing doInBackground()  11-19 12:39:44.842: E/AndroidRuntime(29746):    at android.os.AsyncTask$3.done(AsyncTask.java:299)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.setException(FutureTask.java:219)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.run(FutureTask.java:239)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.lang.Thread.run(Thread.java:856)  11-19 12:39:44.842: E/AndroidRuntime(29746): Caused by: java.lang.NullPointerException  11-19 12:39:44.842: E/AndroidRuntime(29746):    at com.example.projectfortab.FirstActivity$JSONParse.doInBackground(FirstActivity.java:260)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at com.example.projectfortab.FirstActivity$JSONParse.doInBackground(FirstActivity.java:1)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at android.os.AsyncTask$2.call(AsyncTask.java:287)  11-19 12:39:44.842: E/AndroidRuntime(29746):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)  11-19 12:39:44.842: E/AndroidRuntime(29746):    ... 4 more  

Answer by Suneel Prakash for Parsing JSON api starting from an array - [

Read the response to a String and then use the following code.

    try {          JSONObject jsonObject = new JSONArray("ResponseString").getJSONObject(0);          jsonObject.getString("RequiredStrings");                      ----                      ----       } catch (JSONException e) {          // TODO Auto-generated catch block          e.printStackTrace();      }  

Answer by Shani Goriwal for Parsing JSON api starting from an array - [

try to this..

  String request = value[0];    response = webAPIRequest.performPost_String(request,null);    if(response != null)      {                  Log.i("Message Send Respopnce:==",response);                  try {                      JSONObject j_object_main=new JSONObject(response);                      JSONObject j_object_data=j_object_main.optJSONObject("data");                        success=j_object_data.optString("Success");                        if(success.equalsIgnoreCase("1"))                      {                            JSONArray jarray_news=j_object_data.optJSONArray("newInfo");                for(int i=0;i

Answer by GrIsHu for Parsing JSON api starting from an array - [

Try out as below:

JSONArray m_arry = new JSONArray("your response");      for (int i = 0; i < m_arry.length(); i++)         {      JSONObject m_mydetail = m_arry.getJSONObject(i);                String id=m_mydetail.getString("Id");              String firstName=m_mydetail.getString("FirstName");              String lastName=  m_mydetail.getString("LastName");               String email =m_mydetail.getString("Email");             ...............................              //and so on.       }  

For more check HERE

Answer by Jhanvi for Parsing JSON api starting from an array - [

Try this:

        URL url1 = new URL("YOUR_URL");          HttpURLConnection request1 = (HttpURLConnection) url1.openConnection();          request1.setRequestMethod("GET");          request1.connect();          String responseBody = convertStreamToString(request1.getInputStream());          JSONArray jsonArray = new JSONArray(responseBody);          for (int i = 0; i < jsonArray.length(); i++) {              String email = jsonArray.getJSONObject(i).getString("Email");              System.out.println(email);                //... Similarly you can parse all the objects..          }  

Method used in above class:

private static String convertStreamToString(InputStream is) {          BufferedReader reader = new BufferedReader(new InputStreamReader(is));          StringBuilder sb = new StringBuilder();          String line = null;          try {              while ((line = reader.readLine()) != null) {                  sb.append(line).append("\n");              }          } catch (IOException e) {          } finally {              try {                  is.close();              } catch (IOException e) {              }          }            return sb.toString();      }  

Answer by SHASHIDHAR MANCHUKONDA for Parsing JSON api starting from an array - [

 try {          JSONArray jarray = new JSONArray(Resoponsedata);         JSONObject jobject = jarray.getJSONObject(0);          String id =  jobject .getString("Id");                  ---------------      } catch (JSONException e) {          e.printStackTrace();      }  

refer http://jsontree.com/

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