public class MainActivity extends SherlockActivity implements ActionBar.OnNavigationListener,
        OnItemClickListener {

    @Override protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);


        Context context = getSupportActionBar().getThemedContext();
                R.layout.sherlock_spinner_item);
        list.setDropDownViewResource(R.layout.sherlock_spinner_dropdown_item);

        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        getSupportActionBar().setListNavigationCallbacks(list, this);