WorkManger Worker 주기적 반복 실행

package com.anushka.workmanagerdemo1

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.lifecycle.Observer
import androidx.work.*
import kotlinx.android.synthetic.main.activity_main.*
import java.util.concurrent.TimeUnit

class MainActivity : AppCompatActivity() {

    companion object{
    const val KEY_COUNT_VALUE = "key_count"
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        button.setOnClickListener {
            //setOneTimeWorkRequest()
            setPeriodicWorkRequest()
        }
    }



    private fun setPeriodicWorkRequest(){
       val periodicWorkRequest = PeriodicWorkRequest
           .Builder(DownloadingWorker::class.java,16,TimeUnit.MINUTES)
           .build()
      WorkManager.getInstance(applicationContext).enqueue(periodicWorkRequest)
    }
}

Worker

package com.anushka.workmanagerdemo1

import android.content.Context
import android.util.Log
import androidx.work.Data
import androidx.work.Worker
import androidx.work.WorkerParameters
import java.lang.Exception
import java.text.SimpleDateFormat
import java.util.*

class UploadWorker(context: Context,params:WorkerParameters) : Worker(context,params) {

    companion object{
        const val KEY_WORKER = "key_worker"
    }

    override fun doWork(): Result {
        try {
            val count = inputData.getInt(MainActivity.KEY_COUNT_VALUE,0)
            for (i in 0 until count) {
                Log.i("MYTAG", "Uploading $i")
            }

            val time = SimpleDateFormat("dd/M/yyyy hh:mm:ss")
            val currentDate = time.format(Date())

            val outPutData = Data.Builder()
                .putString(KEY_WORKER,currentDate)
                .build()

            return Result.success(outPutData)
        } catch (e:Exception){
            return Result.failure()
        }
    }
}