faiz786

class Decryptor(private val storage: SharedPreferences) {
    private val ANDROID_KEY_STORE = "AndroidKeyStore"
    private val TRANSFORMATION = "AES/GCM/NoPadding"

    private var keyStore: KeyStore? = null

    init {
        initKeyStore()
    }

faiz786

class Encryptor(private val sharedPreferences: SharedPreferences) {
    private val ANDROID_KEY_STORE = "AndroidKeyStore"

    private var initVector: ByteArray? = null
    private var encryption: ByteArray? = null
    private val TRANSFORMATION = "AES/GCM/NoPadding"

    @Throws(Exception::class)
    fun encryptTextWithAES(alias: String, textToEncrypt: String): ByteArray? {
        var alias = alias

faiz786

override fun onBindViewHolder(holder: ViewHolder,
                              position: Int,
                              payloads: MutableList<Any>) {
    if (!payloads.isEmpty()) {
        // Because these updates can be batched,
        // there can be multiple payloads for a single bind
        when (payloads[0]) {
            Payload.FAVORITE_CHANGE -> {
                // Change only the "favorite" icon,
                // leave background image alone: