v 4

MainActivity.kt

class MainActivity : ComponentActivity(R.layout.activity_main) {

    private lateinit var viewModel: MainViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        viewModel = ViewModelProvider(viewModelStore, ViewModelProvider.NewInstanceFactory())
            .get(MainViewModel::class.java)

        textView.text = "${viewModel.count}"
        button.setOnClickListener {
            viewModel.inc()
            textView.text = "${viewModel.count}"
        }
    }
}