class MainActivity : AppCompatActivity() { lateinit var binding: ActivityMainBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityMainBinding.inflate(layoutInflater) setContentView(binding.root) binding.btnRoll.setOnClickListener { rollDice() } } private fun rollDice() { val random = Random().nextInt(6) + 1 binding.txt_random.setText("random") } }