android os NetworkOnMainThreadException with android 4 2

Question

Here i am using this code load Json  It is work fine with android 2 2 but when i am using android 4 2 it throws android os NetworkOnMainThreadException   exception please give me solution   public class JSONParser        static InputStream is   null   static JSONObject jObj   null  static String json           constructor public JSONParser         public JSONObject getJSONFromUrl String url            Making HTTP request     try              defaultHttpClient         DefaultHttpClient httpClient   new DefaultHttpClient            HttpGet httpPost   new HttpGet url                HttpResponse getResponse   httpClient execute httpPost              final int statusCode   getResponse getStatusLine   getStatusCode                if  statusCode    HttpStatus SC OK                   Log w getClass   getSimpleName                        Error     statusCode     for URL     url                  return null                           HttpEntity getResponseEntity   getResponse getEntity               HttpResponse httpResponse   httpClient execute httpPost             HttpEntity httpEntity   httpResponse getEntity            is   getResponseEntity getContent                       catch  UnsupportedEncodingException e            e printStackTrace          catch  ClientProtocolException e            e printStackTrace          catch  IOException e            Log d  IO   e getMessage   toString             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 JSONObject json         catch  JSONException e            Log e  JSON Parser    Error parsing data     e toString                   return JSON String     return jObj          i am also using google api

User · Answer

Please make sure that you don t do any network access on UI Thread  instead  do it in  Async Task  The reason why your application crashes on Android versions 3 0 and above  but works fine on Android 2 x is because  since HoneyComb are much stricter about abuse against the UI Thread  For example  when an Android device running HoneyComb or above detects a network access on the UI thread  a NetworkOnMainThreadException will be thrown   See this

User · Answer

This is the correct way   public class JSONParser extends AsyncTask  lt String  Void  String gt        static InputStream is   null   static JSONObject jObj   null  static String json           constructor public JSONParser         Override protected String doInBackground String    params             Making HTTP request     try              defaultHttpClient         DefaultHttpClient httpClient   new DefaultHttpClient            HttpGet httpPost   new HttpGet url                HttpResponse getResponse   httpClient execute httpPost              final int statusCode   getResponse getStatusLine   getStatusCode                if  statusCode    HttpStatus SC OK                   Log w getClass   getSimpleName                        Error     statusCode     for URL     url                  return null                           HttpEntity getResponseEntity   getResponse getEntity               HttpResponse httpResponse   httpClient execute httpPost             HttpEntity httpEntity   httpResponse getEntity            is   getResponseEntity getContent                       catch  UnsupportedEncodingException e            e printStackTrace          catch  ClientProtocolException e            e printStackTrace          catch  IOException e            Log d  IO   e getMessage   toString             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 JSONObject json         catch  JSONException e            Log e  JSON Parser    Error parsing data     e toString                   return JSON String     return jObj      protected void onPostExecute String page             onPostExecute          To call it  from main    mJSONParser   new JSONParser    mJSONParser execute

User · Answer

Write below code into your MainActivity file after setContentView R layout activity main    if  android os Build VERSION SDK INT  gt  9        StrictMode ThreadPolicy policy   new StrictMode ThreadPolicy Builder   permitAll   build        StrictMode setThreadPolicy policy       And below import statement into your java file   import android os StrictMode

User · Answer

android os NetworkOnMainThreadException occurs when you try to access network on your main thread  You main activity execution   To avoid this  you must create a separate thread or AsyncTask or Runnable implementation to execute your JSON data loading  Since HoneyComb you can not further execute the network task on main thread   Here is the implementation using AsyncTask for a network task execution

User · Answer

Use StrictMode Something like this -      if  android os Build VERSION SDK INT  gt  9            StrictMode ThreadPolicy policy   new StrictMode ThreadPolicy Builder   permitAll   build             StrictMode setThreadPolicy policy

[android] android.os.NetworkOnMainThreadException with android 4.2

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