tutorial - problem mit einer ListActivity

public class MyList extends ListActivity {
    
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        String[] names = new String[] { "Linux", "Windows7", "Eclipse", "Suse", 
                                        "Ubuntu", "Solaris", "Android", "iPhone"};
        //Füllen der Liste
        this.setListAdapter(new ArrayAdapter<String>(this, R.layout.main, names));
    
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id)   {
        super.onListItemClick(l, v, position, id);
        
        Object o = this.getListAdapter().getItem(position);
        String text = o.toString();
        Toast.makeText(this, "Du hast " + text + " ausgewählt!", Toast.LENGTH_LONG).show();
    }
}