First v

MainActivity.kt

class MainActivity : ComponentActivity(R.layout.activity_main) {
    private var count: Int = 0
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        
        textView.text = "$count"
        button.setOnClickListener {
            count++
            textView.text = "$count"
        }
    }
}