Progress Dialog and Threads

private Handler handlerRefresh = new Handler()
{
    @Override
    public void handleMessage(Message msg)
    {
         // Code to process the response and update UI.
         Bundle resBundle = (Bundle) msg.obj;
         String question = resBundle.getString(BUNDLE_QUESTION);
    }
}
   		

...

dialog = ProgressDialog.show(CurrentActivity.this, "","Posting to twitter...", true);

       	new Thread(new Runnable()
       	{
   			public void run()
   			{
   				TwitterPost.Post(getBaseContext(), tweetString);
   				
   				Message myMessage=new Message();
   				Bundle resBundle = new Bundle();
   				resBundle.putString(BUNDLE_USER_ANSWER, tweetString);
   				myMessage.obj=resBundle;
   				handlerTwitterPost.sendMessage(myMessage);
   				dialog.dismiss();
   			}
       	}).start();

...

private ProgressDialog dialog;