java - ProgressBar is not stopped after Completing Background Execution in Android -

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I am working in Android technology. In my application, I am bringing data from the web service. Service. It is true that there is a wrong data on the toast or the right but my progress bar continues to run, when the background work is completed its execution, then I dismissed the method in the transmitted piecetext (). But it failed to dismiss the progress bar.

Can you tell me what I did wrong in my code. Please solve my problem ..

I am attaching source code here

async work

  public class MyTask AsyncTask and lt; String, zero, string & gt; {@Override protected void onPostExecute (string result) {// TODO automatically generated method stub super.onPostExecute (results); Pd.dismiss (); Toast. Make text (getApplicationContext (), "" + result, toast.lNGTH_LONG) .show (); } @ Override Protected Zero on PreExecute () {// TODO Automatically generated method stub super.onPreExecute (); PD = new progress DIOL Ogh (main activity.); Pd.setMessage ("Please Wait"); Pd.setCancelable (wrong); Pd.setIndeterminate (wrong); Pd.show (); } @ Override protected string doInBackground (string ... arg0) {// TODO auto-generated method stub V = new valid (); String result; Results = v.SendParam (URL, user, passed); Return result; }}  

ID valid here. Java code

  class valid {ArrayList & lt; NameValuePair & gt; Namevaluepair; InputStream is; String rays; Send Public StringParam (String URL, String Username, String Password) {Try {HTTP Client Client = New Default HTTP Client}; HTTP Post Post = New HTTP Post (URL); // add parameter here namevaluepair = new ArrayList & lt; NameValuePair & gt; (); Namevaluepair.add (new BasicNameValuePair ("id", user name)); Namevaluepair.add (New BasicNameValuePair ("password", password)); Post.setEntity (new UrlEncodedFormEntity (namevaluepair)); HttpResponse response = client.execute (post); HttpEntity unit = response.getEntity (); Is = entity.getContent (); } Hold (exception e) {log d. ("Http connection", "error", e); } // Read the answer from the attempt {BufferedReader Reader = New BufferedReader (New InputStreamRadder ("ISO-885 9-1"), 8); Stringbuilder builder = new stringbiller (); String line; While ((line = reader. Readline ()) = null) {builder.append (row + "\ n"); }               is close(); Race = builder.toString (); } Hold (exception e) {log d. ("Reading input stream", "", e); } Return Ridge; }}