Android dynamic change

int i = 0; onCreate(...){ Thread thr = new Thread(mTask); thr.start(); } .... Runnable mTask = new Runnable() { public void run() { // just sleep for 30 seconds. try { Thread.sleep(2000); i++; runOnUiThread(done); Thread.sleep(3000); i++; runOnUiThread(done); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }; Runnable done = new Runnable() { public void run() { tv_text.setText("" + i); } };