How to add a Snackbar in Android

 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:id="@+id/layout"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Open Snackbar"
        android:textAllCaps="false"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

 </androidx.constraintlayout.widget.ConstraintLayout>

 import android.annotation.SuppressLint
 import android.os.Bundle
 import android.widget.Button
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import androidx.constraintlayout.widget.ConstraintLayout
 import com.google.android.material.snackbar.Snackbar


 class MainActivity : AppCompatActivity() {
    var layout: ConstraintLayout? = null
    lateinit var button: Button

    @SuppressLint("MissingInflatedId")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        button = findViewById(R.id.button)
        layout = findViewById(R.id.layout);
        val text = "Candidroot Solutions"
        button.setOnClickListener {
            showToast(text)
        }
    }

    @SuppressLint("ResourceType")
    private fun showToast(text: String) {
        val snackbar = layout?.let {
            Snackbar
                .make(
                    it,
                    text,
                    Snackbar.LENGTH_LONG
                )
                .setAction(
                    "UNDO"

                )

                {
                    Toast
                        .makeText(
                            this@MainActivity,
                            "Undo Clicked",
                            Toast.LENGTH_SHORT
                        )
                         .show()
                 }
         }
 
         snackbar?.show()

     }
 }