This gist is part of https://github.com/widiarifki/android-playground/tree/master/compose

ShoppingListActivity.kt

class ShoppingListActivity : ComponentActivity() {

    private val viewModel by viewModels<ShoppingListViewModel>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            // observeAsState() hanya bisa dipanggil dari fungsi Composable
            // tujuannya a/ utk mengobserve LiveData dan direpresentasikan ke dalam State
            val shoppingItemsState = viewModel.shoppingItems.observeAsState(listOf())
            val shoppingItems by rememberSaveable { shoppingItemsState }
            
            MaterialTheme {
                ShoppingListScreen(
                    isLoading = viewModel.isLoading,
                    shoppingItems = shoppingItems,
                    onAddItem = viewModel::addItem,
                    onToggleTickItem = viewModel::toggleTickItem,
                    onDeleteItem = viewModel::deleteItem
                )
            }
        }
    }
}