FileDownloadWorker.kt

override suspend fun doWork(): Result {

    val fileUrl = inputData.getString(FileParams.KEY_FILE_URL) ?: ""
    val fileName = inputData.getString(FileParams.KEY_FILE_NAME) ?: ""
    val fileType = inputData.getString(FileParams.KEY_FILE_TYPE) ?: ""

    Log.d("TAG", "doWork: $fileUrl | $fileName | $fileType")


    if (fileName.isEmpty()
        || fileType.isEmpty()
        || fileUrl.isEmpty()
    ){
        Result.failure()
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){

        val name = NotificationConstants.CHANNEL_NAME
        val description = NotificationConstants.CHANNEL_DESCRIPTION
        val importance = NotificationManager.IMPORTANCE_HIGH
        val channel = NotificationChannel(NotificationConstants.CHANNEL_ID,name,importance)
        channel.description = description

        val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager?

        notificationManager?.createNotificationChannel(channel)

    }

    val builder = NotificationCompat.Builder(context,NotificationConstants.CHANNEL_ID)
        .setSmallIcon(R.drawable.ic_launcher_foreground)
        .setContentTitle("Downloading your file...")
        .setOngoing(true)
        .setProgress(0,0,true)

    NotificationManagerCompat.from(context).notify(NotificationConstants.NOTIFICATION_ID,builder.build())

    val uri = getSavedFileUri(
        fileName = fileName,
        fileType = fileType,
        fileUrl = fileUrl,
        context = context
    )

    NotificationManagerCompat.from(context).cancel(NotificationConstants.NOTIFICATION_ID)
    return if (uri != null){
        Result.success(workDataOf(FileParams.KEY_FILE_URI to uri.toString()))
    }else{
        Result.failure()
    }

}