Android LazyColumn 单选中的状态提升. Jetpack compose

如果您想要一个单一的 Select ，您可能应该考虑将您的List放在一个类中，并通过List的迭代器执行所有 struct 更改.

class CardListState {
    val list = mutableStateListOf(PointsCard(0),PointsCard(1),PointsCard(2),PointsCard(3),PointsCard(4),PointsCard(5))

    fun onSelected(isSelected: Boolean, item: PointsCard) {
        val iterator = list.listIterator()
        while (iterator.hasNext()) {
            val obj = iterator.next()
            if (obj.key != item.key) {
                iterator.set(obj.copy(state = false))
            } else {
                iterator.set(obj.copy(state = isSelected))
            }
        }
    }
}

@Composable
fun ExpandableCardList() {

    val cardListState = remember { CardListState() }
    val state = rememberLazyListState()

    Scaffold { paddingValues ->
        LazyColumn(
            state = state,
            modifier = Modifier
                .fillMaxWidth(),
            contentPadding = paddingValues
        ) {
            items(cardListState.list, {it.key} ) { item ->
                ExpandableCard(
                    expanded = item.state,
                    state = { bool ->
                        cardListState.onSelected(bool, item)
                    }
                )
            }
        }
    }
}

@Composable
fun ExpandableCard(
    expanded: Boolean,
    state: (bool:Boolean) -> Unit
) {
    Card(
        Modifier
            .fillMaxWidth()
            .clickable {
                state(!expanded)
            }
            .background(Color.Black)
    ) {
        Column(Modifier.background(Color.Black))
        {
            Box(
                Modifier
                    .fillMaxWidth()
                    .height(54.dp)
                    .background(Color.Red)
            )
            AnimatedVisibility(expanded) {
                Box(
                    Modifier
                        .fillMaxWidth()
                        .padding(start = 10.dp)
                        .heightIn(56.dp, 300.dp)
                        .background(Color.Green)
                )
            }
        }
    }
}