public class HelloNoBase extends Activity {

    private DatabaseHelper databaseHelper = null;

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (databaseHelper != null) {
            OpenHelperManager.releaseHelper();
            databaseHelper = null;
        }
    }

    private DatabaseHelper getHelper() {
        if (databaseHelper == null) {
            databaseHelper = OpenHelperManager.getHelper(this,
                DatabaseHelper.class);
        }
        return databaseHelper;
    }
}