Display.getInstance().startBackgroundFetchService(new BackgroundFetchTask() {

    /**
     * Just a null perform fetch that never loads any data.
     * This method must return one of RESULT_NEW_DATA, RESULT_NO_DATA,
     * or RESULT_FAIL.
     */
    @Override
    public int performFetch() {
        System.out.println("In performFetch()");
        return BackgroundFetchTask.RESULT_NO_DATA;

        // Note, you could also perform a network request here, but
        // it must be performed synchronously as the method
        // must return an accurate value when the network
        // request is done.
    }

    /**
     * Returns the preferred interval in seconds in which the update should
     * run. When running in the foreground the actual interval will be pretty
     * close to this preferred interval.  When in the background, there are
     * no guarantees. E.g. on iOS the OS will only fetch new data between 20
     * and 40 times per day per user.
     *
     * Return 0 to automatically set to the OS minimum value (when in
     * foreground, 0 will be rounded up to 1 hour).
     */
    @Override
    public int getPreferredInterval() {
        return 5000;
    }

});