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import org.bouncycastle.jce.provider.BouncyCastleProvider
import java.security.Security
import javax.crypto.SecretKeyFactory
import javax.crypto.spec.PBEKeySpec
import javax.crypto.spec.SecretKeySpec

private fun getSecretKey(salt: ByteArray): SecretKeySpec {
    // Adicione o provedor Bouncy Castle
    Security.addProvider(BouncyCastleProvider())

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import android.security.keystore.KeyProperties
import androidx.annotation.RequiresApi
import co.tob.charan.constants.EncryptConstants.ENC_VALUE
import co.tob.charan.constants.EncryptConstants.IV_VALUE
import co.tob.charan.constants.EncryptConstants.SALT_VALUE
import co.tob.charan.utils.fromBytetoString
import java.security.Key
import java.security.SecureRandom

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import java.math.BigInteger
import java.security.*
import java.security.cert.Certificate
import java.security.cert.CertificateEncodingException
import java.security.cert.CertificateException
import java.security.cert.CertificateFactory
import java.security.cert.X509Certificate
import java.time.LocalDate
import java.time.ZoneOffset
import java.util.*

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    @TargetApi(23)
    fun signData(data: String, alias: String): String {
        try {
            //We get the Keystore instance
            val keyStore: KeyStore = KeyStore.getInstance(ANDROID_KEYSTORE).apply {
                load(null)
            }

            //Retrieves the private key from the keystore
            val privateKey: PrivateKey = keyStore.getKey(alias, null) as PrivateKey

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fun recoveryPrivateKey(alias: String): PrivateKey {
        val keyStore = createKeyStore()
        val privateKey = keyStore.getKey(alias, null) as PrivateKey
        return privateKey
    }

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fun recoveryPublic(alias: String): PublicKey {
        val keyStore = createKeyStore()
        val cert: Certificate = keyStore.getCertificate(alias)
        val publicKey: PublicKey = cert.publicKey
        return publicKey
    }

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list.adapter = RvAdapter { name ->
            editText.setText(name)
            motionLayout.transitionToEnd()
        }

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package pl.tkadziolka.motionlayout

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.simple_item.view.*

class RvAdapter(private val listener: (String) -> Unit) : RecyclerView.Adapter<SimpleItem>() {

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Don't expose MutableLiveData

Example from Android Jetpack: LiveData

MutableLiveData Example

Fun with LiveData (Android Dev Summit '18)

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