PeriodicWorkRequestExample.kt

val constraints = Constraints.Builder()
                   .setRequiresCharging(true)
                   .build()

val work = PeriodicWorkRequestBuilder<MyWorker>(
       // repeatInterval (the period cycle), its minimum is 15 minutes
       1, TimeUnit.HOURS, 
       // flexInterval, its minimum is 5 minutes
       15, TimeUnit.MINUTES)
                   .setConstraints(constraints)
                   .build()
                   
val workManager = WorkManager.getInstance(context)

workManager.enqueuePeriodicWork(work)