Work Manager with periodic request called multiple times

Question

I'm using work manager for periodic task. I've to execute single instance of worker

my code is below

  val workManager = WorkManager.getInstance()
  val callDataRequest = PeriodicWorkRequest.Builder(MyLoggerWork::class.java,
                15, TimeUnit.MINUTES)
                .addTag(worker)
                .build()
   workManager.enqueueUniquePeriodicWork(worker, ExistingPeriodicWorkPolicy.KEEP, callDataRequest)

and my worker logs as follows

18/09/2018 03:18:19
18/09/2018 03:18:19
18/09/2018 03:18:19
18/09/2018 03:18:19

18/09/2018 03:37:18
18/09/2018 03:37:18
18/09/2018 03:37:18
18/09/2018 03:37:18

here is my MyLoggerWork class

public class MyLoggerWork: Worker(){


override fun doWork(): Result {
    addlog()
    return Worker.Result.SUCCESS
}

private fun addlog() {

    try {

        val directory = File(Environment.getExternalStorageDirectory().path + "/", "Jobs")
        if (!directory.exists()) {
            directory.mkdir()
        }
        val file = File(directory.path, "jobs_.txt")
        if (!file.exists() && directory.exists()) {
            file.createNewFile()
        }
        try {
            val text = SimpleDateFormat("dd/MM/yyyy hh:mm:ss").format(Date())
            val stream = FileOutputStream(file, true)
            stream.write("\r\n".toByteArray())
            stream.write(text.toByteArray())
            stream.close()
        } catch (e: Exception) {
            e.printStackTrace()
        }

    } catch (e: IOException) {
        e.printStackTrace()
    }
}
}

i am using following dependency

 implementation 'android.arch.work:work-runtime:1.0.0-alpha08'

why my work gets called 4 times???

Answer 1

You are using a very old version of WorkManager. You should switch to the latest stable version. You can try using 1.0.1 or better yet, switch to 2.0.1 which includes androidx dependencies.