showing progress bar during network call

I want to show the progress bar during web service call. I called progress bar before calling the service, but it is being called after the service call is finished and i have received the response.

ProgressDialog dialog = ProgressDialog.show(LogIn.this,"","Loading. Please wait...", true);

 status=Loginvalid(method,username,psword); //calling the method for making service call

But, progress dialog is starting after the response is received from the service. Please how can i fix this problem..

  public class Progress extends AsyncTask<String, Void, Void> {



        protected void onPreExecute() {
            ProgressDialog dialog = new MyProgressDialog(MyActivity.this, "Loading.. Wait..");
            dialog.show();
        }

        @Override
        protected Void doInBackground(String... params) {
            // TODO Auto-generated method stub


                    // do your network connection

            return null;
        }

        protected void onPostExecute(Void unused) {
            dialog.dismiss(); 

        }

    }

Use AsyncTask. It is the most effective and painless way of showing a progress dialog during a web service call.

show the progressbar on preexecute, call your webservice in doInBackground method, and dismiss the progressbar onPostexecute.

http://developer.android.com/reference/android/os/AsyncTask.html

In order to properly show the progress dialog it must be executed on UIThread, while all the other work(service call) - in another. See the example here.