WorkManagerSchedulers.kt

fun getSchedulers(): List<Scheduler> {
    if (mSchedulers == null) {
        mSchedulers = Arrays.asList(
                Schedulers.createBestAvailableBackgroundScheduler(mContext),
                GreedyScheduler(mContext, this))
    }
    return mSchedulers
}

internal fun createBestAvailableBackgroundScheduler(context: Context): Scheduler {
    var scheduler: Scheduler
    var enableFirebaseJobService = false
    var enableSystemAlarmService = false

    if (Build.VERSION.SDK_INT >= WorkManagerImpl.MIN_JOB_SCHEDULER_API_LEVEL) {
        scheduler = SystemJobScheduler(context)
        setComponentEnabled(context, SystemJobService::class.java, true)
    } else {
        try {
            scheduler = tryCreateFirebaseJobScheduler(context)
            enableFirebaseJobService = true
        } catch (e: Exception) {
            scheduler = SystemAlarmScheduler(context)
            enableSystemAlarmService = true
        }

    }

    setComponentEnabled(context, FIREBASE_JOB_SERVICE_CLASSNAME, enableFirebaseJobService)
    setComponentEnabled(context, SystemAlarmService::class.java, enableSystemAlarmService)

    return scheduler
}