Create your foreground task

ReposForegroundService.kt

class ReposForegroundService : ForegroundTaskService() {

    override fun getNotification(): Notification {
        // create channel
        val channelId = resources.getString(R.string.my_channel)
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            val notificationChannel = NotificationChannel(channelId, channelId, NotificationManager.IMPORTANCE_DEFAULT)
            notificationChannel.setSound(null, null)
            val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            notificationManager.createNotificationChannel(notificationChannel)
        }

        return NotificationCompat.Builder(this, channelId)
            .setContentTitle(resources.getString(R.string.my_title))
            .setContentText(resources.getString(R.string.my_body))
            .setSmallIcon(R.drawable.ic_launcher_foreground)
            .build() 
    }

    // Called from a background thread
    override fun doWork(): Result {
        return try { 
            val repos = GitHubRepo(getNetworkService()).getRepos().execute()
            Result.Success 
        } catch (e: Exception) { 
            if (foregroundTaskInfo.retryCount >= MAX_RETRIES) { 
                Result.Failed 
            } else { 
                Result.Retry 
            } 
        } 
    }

    override fun onStop(stoppedCause: StoppedCause): Result {
        return when (stoppedCause) {
            StoppedCause.Timeout -> onTimeout() // called when timeout was reached according to ForegroundTaskInfo.timeoutMillis
            StoppedCause.ConnectionNotAllowed -> Result.Retry // called when connection type was changed while work is being executed
            StoppedCause.TerminatedBySystem -> Result.Failed // called when the system decided to stop the task while work is being executed 
        } 
    }

    private fun onTimeout(): Result {
        return if (foregroundTaskInfo.retryCount >= MAX_RETRIES) { 
            Result.Failed 
        } else { 
            Result.Retry 
        } 
    }
}