MainActivityCompose.kt

class MainActivity : AppCompatActivity() {

    private val viewModel by viewModels<MainViewModel>()

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

        setContent {
            val count by viewModel.count.collectAsState()
            MdcTheme {
                Row(
                    modifier = Modifier
                        .fillMaxSize()
                        .padding(horizontal = 16.dp),
                    verticalAlignment = Alignment.CenterVertically
                ) {
                    Button(onClick = { viewModel.decrease() }) {
                        Text("Kurang")
                    }

                    Text(
                        "Jumlah: $count",
                        modifier = Modifier
                            .weight(1f)
                            .align(Alignment.CenterVertically),
                        textAlign = TextAlign.Center
                    )

                    Button(onClick = { viewModel.increase() }) {
                        Text("Tambah")
                    }
                }
            }
        }
    }
}