我有一个 mutableStateListOf(ReturnItemExamples)，列表中的每个对象都显示在 LazyColumn 中。
我遇到的问题是，一旦我使用 OutlinedTextField 更新数量，它会调用 API（在 viewModel 上）来更新记录，在 API 返回成功结果并将其更新到 mutableStateListOf(ReturnItemExamples) 列表之后，数量的更新未显示在 OutlinedTextField 中。我相信更新正在发生，并且它正在触发可组合项的重绘，因为我还有其他字段正在更新，唯一遇到问题的字段是 OutlinedTextField。这是唯一一个没有在屏幕上更新的。
这是具有数量属性的数据模型：
class ReturnItemExample (
val itemCode: String? = null,
val itemDescription: String? = null,
var quantity: Int = 0
)
这是视图模型：
@HiltViewModel
class ReturnsViewModelExample @Inject constructor(
val app: Application,
val authToken: String,
private val repository: ReturnsRepository,
) : AndroidViewModel(app) {
val returnItems = mutableStateListOf<ReturnItemExample>()
private fun updateReturnExample(quantity: Int, index: Int) {
viewModelScope.launch {
// Call to an API here returns the updated ReturnItemExample object and I update it here
// with a function that sets the item from the API response to the item in the array at
// the specified index
returnItems[index] = API.response
}
}
}
这是列表视图：
@Composable
fun ReturnsListViewExample(
viewModel: ReturnsViewModelExample,
) {
val itemIndex = remember { mutableIntStateOf(0) }
Column {
Box() {
LazyColumn(state = rememberLazyListState()) {
itemsIndexed(viewModel.returnItems) { index, _ ->
ReturnItemViewExample(
viewModel = viewModel,
itemIndex = index
)
}
}
}
}
}
这是显示我遇到问题的 OutlinedTextField 的可组合项：
@OptIn(ExperimentalComposeUiApi::class)
@Composable
fun ReturnItemViewExample(
viewModel: ReturnsViewModelExample,
itemIndex: Int
) {
val keyboardController = LocalSoftwareKeyboardController.current
val itemData = viewModel.returnItems[itemIndex]
var testDisplayQuantity by remember { mutableStateOf(itemData.quantity.toString()) }
Row(
modifier = Modifier
.fillMaxWidth()
.padding(horizontal = 16.dp)
.padding(bottom = 8.dp),
horizontalArrangement = Arrangement.Center,
verticalAlignment = Alignment.CenterVertically
) {
Text(
text = "Test Quantity",
fontSize = 14.sp,
fontWeight = FontWeight.SemiBold,
textAlign = TextAlign.Center
)
OutlinedTextField(
value = testDisplayQuantity,
onValueChange = { testDisplayQuantity = it },
textStyle = LocalTextStyle.current.copy(fontSize = 14.sp),
maxLines = 1,
modifier = Modifier
.fillMaxWidth(.5f)
.padding(horizontal = 8.dp)
.onKeyEvent {
if (it.nativeKeyEvent.keyCode == KeyEvent.KEYCODE_ENTER) {
if (validQuantity(testDisplayQuantity.toInt())) {
viewModel.updateReturnExample(testDisplayQuantity.toInt(), itemIndex)
}
}
true
},
keyboardOptions = KeyboardOptions(
keyboardType = KeyboardType.Number,
imeAction = ImeAction.Done
),
keyboardActions = KeyboardActions(
onDone = {
keyboardController?.hide()
if (validQuantity(testDisplayQuantity.toInt())) {
viewModel.updateReturnExample(testDisplayQuantity.toInt(), itemIndex)
}
}),
shape = RoundedCornerShape(10.dp)
)
}
}