#码力全开·技术π对#Jetpack Compose列表项复用导致状态错乱如何根治？

LazyColumn {
    items(
        items = specList,
        key = { spec -> 
            // 复合键防哈希碰撞
            "${spec.groupId}_${spec.itemId}_${spec.lastModified}"
        }
    ) { spec ->
        SpecItem(spec)
    }
}

@Composable
fun SpecItem(spec: ProductSpec) {
    // 把spec的ID焊死在状态上
    val expanded = remember(spec.uniqueKey) { mutableStateOf(false) }
    
    // 复杂状态用自定义remember
    val selectionState = remember(spec.uniqueKey) { 
        SelectionState(initial = spec.selected)
    }
    
    // 状态变更必须回写数据源
    LaunchedEffect(selectionState.current) {
        viewModel.updateSelection(spec.id, selectionState.current)
    }
}

interface ItemKeyScope {
    @Composable
    fun <T : Any> rememberItemKey(item: T): String {
        return remember(item) { UUID.randomUUID().toString() }
    }
}

@Composable
fun DebugStateWatcher(vararg keys: Any?) {
    if (BuildConfig.DEBUG) {
        LaunchedEffect(keys) {
            Log.d("StateTracker", "Keys changed: ${keys.joinToString()}")
        }
    }
}
// 使用：
DebugStateWatcher(spec.uniqueKey)

val localCoroutineScope = rememberCoroutineScope()
val stateMap = remember { mutableStateMapOf<String, Boolean>() }

Button(onClick = {
    localCoroutineScope.launch {
        stateMap[spec.id] = !stateMap.getOrDefault(spec.id, false)
    }
})