ContactList.kt

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            Stability_ImmutabilityTheme {
                val (isChecked, onChecked) = remember { mutableStateOf(false) }
                Column(
                    modifier = Modifier
                        .fillMaxSize()
                        .background(MaterialTheme.colorScheme.background),
                ) {
                    Checkbox(
                        checked = isChecked,
                        onCheckedChange = onChecked
                    )
                    ContactList(
                        contactListState = ContactListState(
                            names = listOf("name1", "name2", "name3", "name4"),
                        )
                    )
                }
            }
        }
    }
}


@Composable
fun ContactList(
    contactListState: ContactListState
) {
    if (contactListState.isLoading) {
        CircularProgressIndicator()
    } else {
        Text(text = contactListState.names.toString())
    }
}

data class ContactListState(
    val names: List<String>,
    val isLoading: Boolean = false,
)