JobScheduler jobs = (JobScheduler) getSystemService(JOB_SCHEDULER_SERVICE);
    JobInfo.Builder b = new JobInfo.Builder(SYNC_JOB_ID,
            new ComponentName(this, SyncJobService.class));
    b.setRequiredNetworkType(JobInfo.NETWORK_TYPE_NONE);
    b.setPeriodic(getPeriod(6)) //6 hours
            .setPersisted(true)
    jobs.schedule(b.build());