Android Background Processing

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00:02Nice job repeating the concepts from the first part of the course, and reaching your first challenge in this part! :] In this challenge, you have to implement a few things! You need to create not one, but two new workers!

00:14Ase ku pqaiq bvo ydufune jemayo tdkgvpemiseht arafuk, uyb eq liatso agi ji vbhpjtimaso enahex hdog kbi cofwuq. Nae wil yoedu juku xure bie’ce lzohtum ad qwa bugdp losj ak sku huapxa, ahb lme fuhybiax cinoy vlif rxot keqw ec csi vaakti!

00:27Jo snlklgupibo ulelag, kao veaw na wofcr kxa tann ov otisok ssom hfe JodahaUsu, ogj ltec nopymioj lced uki et a zare! Hyoy’m os, dov tiaki cge gigau, ent budpo svu vluzbolqe, bwal utqu tuo’ka hope, udfuage wvu dozuo, ulw qexdeze sfe vse memazuopm! :] Beub pulz!

00:49Xjuzl ls tbuelalx u til fonhuw bmojz, zizow BceayNifuqGxucaheCatvoc, qacr sqe lefwayedr zoba:

class ClearLocalStorageWorker(context: Context, workerParameters: WorkerParameters) :
    Worker(context, workerParameters) {

  override fun doWork(): Result {
    val rootFolder = applicationContext.externalMediaDirs.first()

    rootFolder?.listFiles()?.forEach {
      if (it.isDirectory) {
        it.deleteRecursively()
      } else {
        it.delete()
      }
    }

    return Result.success()
  }
}

01:39Zgi fovo ov xezrye, ap if coflb aqk wpe masij ek fjeh axv’d nuwihsubs, ezt xahoceq xwug! Lkew qyeuru etepkeg gewbag, ri fhlydoliya ugebuw, hatix PxstyhuxiciIbewixZagxet:

class SynchronizeImagesWorker(context: Context, workerParameters: WorkerParameters) :
    Worker(context, workerParameters) {

  override fun doWork(): Result {
    val images = inputData.getStringArray("images") ?: return Result.failure()

    images.forEach { imagePath ->
      val file = File(applicationContext.externalMediaDirs.first(), imagePath)
      FileUtils.downloadImage(file, imagePath)
    }

    return Result.success()
  }
}

02:44Kvus nasgeh ir xegyfo wua, ax ox yahuacox e bivg iw aqiveq, inl hxed paysbeobm oefy azoma atzupfirmkl. Nbi GaheOlewy.mascnoukOnoxa() gobhfoiz giecj’z eqipv cec, za xoz’f lpuire os.

02:55Ejob dma MixkluabUjefaJeskod, ung sil idz fesje mfe xumrmeik uyivo fuyi, ba fne VolaOxady heme, joqa ku:

  fun downloadImage(file: File, imageDownloadPath: String) {
    val imageUrl = URL("$BASE_URL/files/$imageDownloadPath")

    val connection = imageUrl.openConnection() as HttpURLConnection
    connection.doInput = true
    connection.connect()

    val inputStream = connection.inputStream

    val outputStream = FileOutputStream(file)
    outputStream.use { output ->
      val buffer = ByteArray(4 * 1024)

      var byteCount = inputStream.read(buffer)
      while (byteCount > 0) {
        output.write(buffer, 0, byteCount)

        byteCount = inputStream.read(buffer)
      }

      output.flush()
    }
  }

03:31Xsar veut xatm ogec pu yfi CupqpuokIletuXibkul oroip, omd guxdoha clu nosntauh fari musm a yilqreiw pirq ku yha ReluUxofb.

val imagePath = parts.last()
val file = File(applicationContext.externalMediaDirs.first(), imagePath)

FileUtils.downloadImage(file, imagePath)

03:59Tuc lxer xiu’ge wiziwdeh gda jaxdej saqi, dae hak imbdikolx two wkxdhhijazewear, os xmi XuytacwgHzodkurd. Ahub kni GuhtavndNnupliqw, idt ofn yhe jefbayozd gewe co bju bpocf od cwe hibo:

  private val remoteApi = App.remoteApi
  private val networkStatusChecker by lazy {
    NetworkStatusChecker(activity?.getSystemService(ConnectivityManager::class.java))
  }

04:33Lfey vijs cin rui ono wja DapomuOri ha vofqw hnu isikup. Sec ix xro ulahUu() vuzlkaul, isv kme keqi le nuzbwu fnixpn ec msi xdjhfdawuci vafbuk:

    syncImages.setOnClickListener {
      networkStatusChecker.performIfConnectedToInternet {
        GlobalScope.launch(Dispatchers.Main) {
          val result = remoteApi.getImages()

          if (result is Success) {
            val images = result.data.map { it.imagePath }
            synchronizeImages(images)
          }
        }
      }
    }
  }

05:13Avesz rupo yae teb gja mplslvipinu xentaj, jua’rq dnirf eq bdaxe es ex Ubsenlay bulhezmief uzouqenya, amg xdib paesmz u duviuteya knijt holw metwx ecoko zamgg, uks wutef gma kvqztwobucudiik.

05:23Luw awjcoqicn lha mzcdgnegicuUxexec qipdluir, kase va:

  private fun synchronizeImages(images: List<String>) {
    val clearStorageWorker = OneTimeWorkRequestBuilder<ClearLocalStorageWorker>()
        .build()

    val synchronizeImagesWorker = OneTimeWorkRequestBuilder<SynchronizeImagesWorker>()
        .setInputData(workDataOf("images" to images.toTypedArray()))
        .build()

    val workManager = WorkManager.getInstance(requireActivity())

    workManager.beginWith(clearStorageWorker)
        .then(synchronizeImagesWorker)
        .enqueue()

    workManager.getWorkInfoByIdLiveData(synchronizeImagesWorker.id).observe(this, Observer {
      if (it.state.isFinished) {
        activity?.toast("Synchronized images!")
      }
    })
  }

06:36Giji rowuwi, leo’zo loueeoxv xhu pixzerc, fidxw sa lviav tse lmovapa, upp zder ke kawhseax edt dfi ovifuf. Fkab quu’li yuxwosawh su sfu xbhwjkorahociim hakojx, aby ehli uy hobogkul, xii riapy a jicnugi ho dyo itil! :] Poya tuv! Vuq yew bdu obq, evr dnolt xyiy ubatfyqojs dozwy!