MainActivity:
package com.cscorner.myapplication2

import android.os.Bundle
import android.widget.Button
import android.widget.ImageView
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContentView(R.layout.activity_main)


        val button: Button=findViewById(R.id.button)
        button.setOnClickListener{
            rollDice()
        }
    }
    private fun rollDice(){
        val dice=Dice(6)
        val diceRoll=dice.roll()
        val img :ImageView=findViewById(R.id.imageView)
        val drawableResource = when(diceRoll){
            1->R.drawable.dice1
            2->R.drawable.dice2
            3->R.drawable.dice3
            4->R.drawable.dice4
            5->R.drawable.dice5
            else->R.drawable.dice5
        }
        img.setImageResource(drawableResource)
    }
}
class Dice(private val numsides:Int){
    fun roll():Int{
        return (1..numsides).random()
    }
}
activity_main.xml:
<?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:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.5"
        tools:srcCompat="@drawable/dice_1" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Roll"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.775" />
</androidx.constraintlayout.widget.ConstraintLayout>