java.lang.illegalstateException：在滚动式的懒惰列中，应将layoutnode附加到所有者
我正在使用lazycolumn和第3页上的lazycolumn来加载联系人，当我滚动列表时，有时会引发以下例外，
java.lang.IllegalStateException: LayoutNode should be attached to an owner
at androidx.compose.ui.node.LayoutNodeKt.requireOwner(LayoutNode.kt:1407)
at androidx.compose.ui.node.ModifierLocalConsumerNode.notifyConsumerOfChanges(ModifierLocalConsumerNode.kt:42)
以下是LazyColumn的代码：
val contactsFlow= viewModel.fetchContacts(context)
val lazyContacts = contactsFlow.collectAsLazyPagingItems()
LazyColumn(
modifier = Modifier.padding(top = 8.dp),
verticalArrangement = Arrangement.spacedBy(8.dp)) {
items(lazyContacts) { contact ->
if(contact != null)
{
Contact(contact = contact, onContactClick = {
viewModel.addMemberFrom(it) { member ->
onContactClick(member)
}
})
}
}
}
这是ViewModel代码：
fun fetchContacts(context: Context): Flow<PagingData<Contact>> {
return Pager(
PagingConfig(10, enablePlaceholders = true, initialLoadSize = 20)
) {
ContactsPagingSource(contactManager, context)
}.flow.cachedIn(viewModelScope)
}
I am using LazyColumn with Paging 3 to load contacts, when I scroll the list its laggy and sometimes it throws the following exception
java.lang.IllegalStateException: LayoutNode should be attached to an owner
at androidx.compose.ui.node.LayoutNodeKt.requireOwner(LayoutNode.kt:1407)
at androidx.compose.ui.node.ModifierLocalConsumerNode.notifyConsumerOfChanges(ModifierLocalConsumerNode.kt:42)
Following is the code for LazyColumn:
val contactsFlow= viewModel.fetchContacts(context)
val lazyContacts = contactsFlow.collectAsLazyPagingItems()
LazyColumn(
modifier = Modifier.padding(top = 8.dp),
verticalArrangement = Arrangement.spacedBy(8.dp)) {
items(lazyContacts) { contact ->
if(contact != null)
{
Contact(contact = contact, onContactClick = {
viewModel.addMemberFrom(it) { member ->
onContactClick(member)
}
})
}
}
}
Here is the viewModel code:
fun fetchContacts(context: Context): Flow<PagingData<Contact>> {
return Pager(
PagingConfig(10, enablePlaceholders = true, initialLoadSize = 20)
) {
ContactsPagingSource(contactManager, context)
}.flow.cachedIn(viewModelScope)
}
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评论（3）
当您使用LazyColumn中的项目列表时，您无法使用NULL检查跳过项目。尝试在您的“联系人”中显示一些东西。它可以是“加载”或默认值。
When you use list of items in LazyColumn you can't skip items with null check. Try show something in your "contact". It can be 'Loading' or default value.
我认为当我尝试在约束布局中使用AnimatedVisibily时，我会遇到同样的崩溃，这是一个错误
I think it's a BUG in compose that I get the same crash when I try to use AnimatedVisibility in ConstraintLayout layout, repeatedly controlling AnimatedVisibility to show and hide
如果您是HorizontalPager，请记住PAGERSTATE，请从Androidx.com.pose.found.pager导入它们，而不是com.google.accompanist：cancerist-page
If you youse HorizontalPager, rememberPagerstate, import them from androidx.compose.foundation.pager, not from com.google.accompanist:accompanist-page