ABS onNavigationItemSelected called twice after change the orientation

Question

Am using Actionbarsherlock to show the listnavigation. When the orientation changed the onNavigationItemSelected method called twice. Let me know what's the issue. below is my sample code.

    private TextView mSelected;
    private String[] mLocations;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        setTheme(SampleList.THEME); //Used for theme switching in samples
        super.onCreate(savedInstanceState);

        setContentView(R.layout.list_navigation);
        mSelected = (TextView)findViewById(R.id.text);

        mLocations = getResources().getStringArray(R.array.locations);

        Context context = getSupportActionBar().getThemedContext();
        ArrayAdapter<CharSequence> list = ArrayAdapter.createFromResource(context, R.array.locations, R.layout.sherlock_spinner_item);
        list.setDropDownViewResource(R.layout.sherlock_spinner_dropdown_item);

        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        getSupportActionBar().setListNavigationCallbacks(list, this);
        getSupportActionBar().setSelectedNavigationItem(1);

    }

    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
        Log.d("ListNavigation", "selected");
        mSelected.setText("Selected: " + mLocations[itemPosition]);
        return true;
    }
}