Gists to embed in WorkManager blog. Full code is available at https://github.com/aruke/WorkManagerDemo.

NetworkWorker_PeriodicRequest.kt

fun buildPeriodicRequest(secretKey: String, userData: Array<String>): PeriodicWorkRequest {
    
    val inputData = Data.Builder()
            .putString(KEY_SECRET_KEY, secretKey)
            .putStringArray(KEY_USER_DATA, userData)
            .build()
    val constraints = Constraints.Builder()
            .setRequiredNetworkType(NetworkType.CONNECTED)
            .setRequiresCharging(true).build()

    return PeriodicWorkRequest.Builder(NetworkWorker::class.java, 6, TimeUnit.HOURS)
            .setInputData(inputData)
            .setConstraints(constraints)
            .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 15, TimeUnit.MINUTES)
            .build()
}