encrypt-config.gradle

ext.encryptfile = { buildFlavor, buildVariant ->  
   def fileToBeEncryptedName = 'config.txt' //name of your file to be encrypted   
   def folder = 'confidential-file' // folder where your encrypted file is to be found   def folderPath = "$project.rootDir/${folder}/${buildFlavor}/${buildVariant}/" //this will resolve file path according to build flavor and build variant   String fileContents = new File("$folderPath$fileToBeEncryptedName").text // read contents of this file  // encryption logic   def IV = new byte[16]  
   def encryption = Encryption.getDefault(encryptKey, encryptSalt, IV) //use encryptKey and encryptSalt defined above   def data = encryption == null ? "" : encryption.encryptOrNull(fileContents)  
   // create file in generated assets folder which can be packaged into the selected flavor/variant apk   def file = new File("$buildDir/generated/assets/shaders/$buildFlavor/$buildVariant/$ext.outputConfigFileName")  
   if (!file.getParentFile().exists()) {  
  file.getParentFile().mkdirs()  
  }  
   if (!file.exists()) {  
   try {  
  file.createNewFile()  
  } catch (Exception e) {  
  e.printStackTrace()  
  }  
  }  
  file.write data //write encrypted data in file}