Timer - threading

private void startTest()
    {
        bStartTest.setEnabled(false);
        Thread timer = new Thread(){
            public void run(){
                for (int i = 0; i < images.size(); i++)
                {
                    String name = images.get(i).getName();
                    imageViewer.setImageResource(getResources().getIdentifier(name, "drawable", getPackageName()));
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                }
            }
        };
        timer.start();
    }