Android :: ListView OnListItemClick Setcontentview Crash?

I have been trying to set a new xml layout, when a particular item on this list is clicked.
Am I missing something, because the emulator crashes when clicked?! setContentViewById(R.id.newxml file)

public class intentProject extends ListActivity
{

ListView list;
ArrayAdapter<String> aa;
List<String> data = new ArrayList<String>();

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);........................