implementation \"androidx.tonyodev.fetch2:xfetch2:3.1.6\"<\/pre>\nThis library will let you download the video\/pdf\/image and many more files of different formats. Here are the code snippets for downloading the video using the Fetch library.<\/p>\n
First of all, you have to define the fetch configuration like below<\/p>\n
val fetchConfiguration: FetchConfiguration = FetchConfiguration.Builder(this)\r\n .setDownloadConcurrentLimit(1).enableLogging(true)\r\n .enableRetryOnNetworkGain(true)\r\n .build()<\/pre>\nUse Fetch.getInstance<\/mark> to get the fetch instance<\/p>\nfetch = Fetch.getInstance(fetchConfiguration)<\/pre>\nPrepare the request as shown below<\/p>\n
val request = videoUrl?.let { \r\n filePath?.let { \r\n it1 -> Request(it, it1)\r\n } \r\n } <\/pre>\nAfter that, you need to set the priority of the request like mentioned<\/p>\n
request?.priority = Priority.HIGH (It can be high, low, and normal)<\/pre>\nSet the network type of the request<\/p>\n
request?.networkType = NetworkType.ALL (Global off, unmetered, and wifi only)<\/pre>\nAdd header with the clientKey<\/em> as shown<\/p>\nrequest?.addHeader(\"clientKey\", \"*************************\") (You can find the clientKey in Fetch dashboard)<\/pre>\nAfter that you need to put it to the queue by using this code<\/p>\n
request?.let {\r\n fetch!!.enqueue(it,\r\n Func { updatedRequest: Request? -> },\r\n Func { error: Error? -> })\r\n }<\/pre>\nUse the Fetch listeners for more operations<\/p>\n
val fetchListener: FetchListener = object : FetchListener {\r\n override fun onQueued(\r\n @NotNull download: Download,\r\n waitingOnNetwork: Boolean\r\n ) {\r\n if (request?.id == download.id) {\r\n }\r\n }\r\n\r\n override fun onProgress(\r\n @NotNull download: Download,\r\n etaInMilliSeconds: Long,\r\n downloadedBytesPerSecond: Long\r\n ) {}\r\n\r\n override fun onCompleted(@NotNull download: Download) {\r\n Log.d(\"downloadingStatus->>\", \"onCompleted: \")\r\n }\r\n\r\n\r\n override fun onPaused(@NotNull download: Download) {\r\n Log.d(\"downloadingStatus->>\",\"video paused\")\r\n }\r\n\r\n override fun onResumed(@NotNull download: Download) {\r\n Log.d(\"downloadingStatus->>\",\"video resumed\")\r\n }\r\n\r\n override fun onStarted(\r\n download: Download,\r\n downloadBlocks: List,\r\n totalBlocks: Int\r\n ) {\r\n Log.d(\"downloadingStatus->>\",\"video started downloading\")\r\n }\r\n\r\n override fun onWaitingNetwork(download: Download) {}\r\n\r\n override fun onAdded(download: Download) {}\r\n override fun onCancelled(@NotNull download: Download) {\r\n Log.d(\"plae->>\",\"video cancelled\")\r\n }\r\n\r\n override fun onRemoved(@NotNull download: Download) {\r\n Log.d(\"plae->>\",\"video removed\")\r\n }\r\n\r\n override fun onDeleted(@NotNull download: Download) {\r\n Log.d(\"plae->>\",\"video deLeted\")\r\n\r\n }\r\n override fun onDownloadBlockUpdated(\r\n download: Download,\r\n downloadBlock: DownloadBlock,\r\n totalBlocks: Int\r\n ) {\r\n Log.d(\"plae->>\",\"video download block updated\")\r\n\r\n }\r\n\r\n override fun onError(\r\n download: Download,\r\n error: Error,\r\n throwable: Throwable?\r\n ) {\r\n Log.d(\"plae->>\",\"video onError\")\r\n }\r\n }\r\n\r\n fetch!!.addListener(fetchListener)<\/pre>\nMoving on towards the next step- Encrypting the video file that we have just downloaded.<\/p>\n
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\nGet in touch with Bacancy, the best Android App Development Company, to hire android app developers<\/a> without wasting a second.<\/em><\/strong><\/p>\nEncrypt the Video File<\/h2>\n
After downloading and saving the video into the directory, you must encrypt that file. You can use the AES\/GCM\/NoPadding algorithm. In this blog, we will implement the AES algorithm<\/strong>.<\/p>\nFirst of all, you need to get the instance as mentioned<\/p>\n
val encipher = Cipher.getInstance(\"AES\")<\/pre>\nSince we integrate the file encryption feature, we need to define the secret key. For generating the secret key, you can use the below code snippet.<\/p>\n
fun generateKey(): SecretKey? {\r\n \/\/ Generate a 256-bit key\r\n val outputKeyLength = 256\r\n val secureRandom = SecureRandom()\r\n \/\/ Do *not* seed secureRandom! Automatically seeded from system entropy.\r\n val keyGenerator = KeyGenerator.getInstance(\"AES\")\r\n keyGenerator.init(outputKeyLength, secureRandom)\r\n return keyGenerator.generateKey()\r\n }<\/pre>\nAttach the secretKey<\/em> with the encipher <\/p>\nencipher.init(Cipher.ENCRYPT_MODE, generateKey())<\/pre>\nAt last, you need to use CipherInputStream <\/em><\/p>\nval cis = CipherInputStream(fileInputStream, encipher)\r\n val buffer = ByteArray(1024) \/\/ buffer can read file line by line to increase speed\r\n while (cis.read(buffer).also({ read = it }) >= 0) {\r\n read?.let { fos.write(buffer, 0, it) }\r\n fos.flush()\r\n }\r\n fos.close()<\/pre>\nDecrypt the Video File<\/h2>\n
You won\u2019t play the encrypted videos directly in your app. For that, you have to decrypt the video file. Use the below code snippet to decrypt the encrypted video files.<\/p>\n
val fos = FileOutputStream(decOutFile)\r\nval encipher = Cipher.getInstance(\"AES\")\r\n\r\nval encodedKey: ByteArray = android.util.Base64.decode(\r\n getFromPrefs(SECRET_KEY, \"\", \"\"),\r\n android.util.Base64.DEFAULT\r\n)\r\nval originalKey: SecretKey = SecretKeySpec(encodedKey, 0, encodedKey.size, \"AES\")\r\n\r\nencipher.init(Cipher.DECRYPT_MODE, originalKey)\r\n\r\nval cis = CipherInputStream(fileInputStream, encipher)\r\n\r\nval buffer = ByteArray(1024) \/\/ buffer can read file line by line to increase speed\r\n\r\nwhile (cis.read(buffer).also({ read = it }) >= 0) {\r\n read?.let { fos.write(buffer, 0, it) }\r\n fos.flush()\r\n}\r\n\r\nfos.close()\r\n<\/pre>\nSo, this was about how we can build a feature: How to Download and Restrict Video Files in Android App. Here are a few important notes to keep in mind.<\/p>\n
![\"Download](\"https:\/\/www.bacancytechnology.com\/blog\/wp-content\/uploads\/2022\/01\/Download-and-Restrict-Video-Files-in-android-app-min-2.jpg\")
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