kotlin 使用无穷大高度约束测量了垂直可滚动组件,这是不允许的

g52tjvyc  于 2023-02-24  发布在  Kotlin
关注(0)|答案(2)|浏览(485)

我正在使用我的recyclerview项目布局中的ComposeView来处理jetpack组合。当我打开屏幕时,我遇到了奇怪的问题

    • 错误**
java.lang.IllegalStateException: Vertically scrollable component was measured with an infinity maximum height constraints, which is disallowed. One of the common reasons is nesting layouts like LazyColumn and Column(Modifier.verticalScroll()). If you want to add a header before the list of items please add a header as a separate item() before the main items() inside the LazyColumn scope. There are could be other reasons for this to happen: your ComposeView was added into a LinearLayout with some weight, you applied Modifier.wrapContentSize(unbounded = true) or wrote a custom layout. Please try to remove the source of infinite constraints in the hierarchy above the scrolling container.

我尝试跟踪此stack overflow,但没有成功

    • 主要活动. xml**
<androidx.recyclerview.widget.RecyclerView
            android:id="@+id/list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="parent" />
    • 项目布局. xml**
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <androidx.compose.ui.platform.ComposeView
        android:id="@+id/itemComposable"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

</androidx.constraintlayout.widget.ConstraintLayout>
    • 视图夹. kt**
class OptionsViewHolder(val binding: ItemLayoutBinding) : Recyclerview.ViewHolder(binding.root) {

    private val context = binding.root.context

    companion object {
        fun from(parent: ViewGroup): OptionsViewHolder {
            return OptionsViewHolder(
                ItemLayoutBinding.inflate(
                    LayoutInflater.from(parent.context),
                    parent,
                    false
                )
            )
        }
    }

    fun bindChoice() {
        binding.itemComposable.setContent {
            BoxWithConstraints {
                LazyColumn(
                    modifier = Modifier
                        .fillMaxWidth()
                        .height(this@BoxWithConstraints.maxHeight)
                        .verticalScroll(rememberScrollState())
                ) {
                    items(getOptions()) { option ->
                        Text(text = option)
                    }
                }
            }
        }
    }

    private fun getOptions() = mutableListOf(
        context.getString(R.string.monitor),
        context.getString(R.string.pressure),
        context.getString(R.string.not_sure)
    )
}
hwamh0ep

hwamh0ep1#

您正在RecyclerView中使用LazyColumn,这是不允许的。LazyColumn等效于合成中的RecyclerView。因此,您正在嵌套RecyclerView或LazyColumn。

68bkxrlz

68bkxrlz2#

在Jetpack合成中制作一个嵌套的垂直列表。
嘿,这很简单,我想出来了..假设我们有一个数据结构(在Kotlin)

val allTransactions = List<Transaction>

val monthlyTransaction = Transaction(monthName: String, monthlyTransactions: List< MonthlyTransactions>)

val monthlyTransaction = MonthlyTransaction(amount: String, date: String)

首先有一个LazyColumn

@Composable
fun mainFunction (){
    LazyColumn {
        if (allTransactions.isNotEmpty()) {
            items(allTransactions.size) { index ->
                // pass each model 
                TransactionComposable(model = allTransactions[index])
            }
        }
    }
}

@Composable
fun TransactionComposable(transaction: Transaction) {
    
    // make the title outside the column so it will be on top of the list
    Text(text = transaction.monthName)  

    Column {
        // make a for each loop inside the column
        transaction.monthlyTransactions.forEach { monthlyTransaction ->
                // for each of your iteration, call your inner list item inside a a row
                Row {
                    TransactionDetailComponent (monthlyTransaction)
                }
            }
        }
    }
}

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