Progress Dialog and Threads

private ProgressDialog dialog;

private Handler handlerRefresh = new Handler()
{
     @Override
     public void handleMessage(Message msg)
     {
          Bundle resBundle = (Bundle) msg.obj;
          String question = resBundle.getString("key");
     }
}

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();