在Jetpack中相当于[NestedScrollView + RecyclerView]或[Nested RecyclerView(另一台回收站内的回收站) [英] What is the equivalent of [NestedScrollView + RecyclerView] or [Nested RecyclerView (Recycler inside another recycler) in Jetpack compose

问题描述

我想在Jetpack compose中创建以下布局.

我尝试在垂直的可滚动框内创建两个列表，但是由于出现此错误，所以这是不可能的:" java.lang.IllegalStateException:不允许嵌套可滚动的相同方向的布局，例如ScrollableContainer和LazyColumn.如果要在项目列表之前添加标头，请查看LazyColumn组件，该组件具有DSL api，该API允许首先通过item()函数添加标头，然后通过items()添加项目列表./p>

我尝试使用以下代码在父列表中创建两个不同的列表，但这也不起作用.

  @Composable有趣的MainList(){LazyColumn(){物品 {/* LazyRow代码在这里*/}物品 {/* LazyColumn代码在这里*/}}} 

现在，我对于在同一活动中还能实现两个列表(一个垂直和一个水平)并使该活动垂直滚动的其他方式一无所知.

解决方案

我认为最好的选择是 LazyVerticalGrid 允许在每个项目上使用某种扩展逻辑，但看起来并非如此还受支持(测试版03).

因此，我将在这里使用一个单独的 LazyColumn 表示整个列表，并使用 LazyRow 表示我的书"；部分.

  LazyColumn(修饰符= Modifier.fillMaxSize()，){//我的书籍部分物品 {列(修饰符= Modifier.fillMaxWidth()){文字(我的书")LazyRow {项(书){项->//每个物品}}}}//收藏清单书名物品 {文字(收藏清单"，样式= MaterialTheme.typography.h4)}//在每个都有两个元素的列表的列表中翻转列表items(wishlisted.windowed(2，2，true)){item->排 {//绘制项目[0]//绘制项目[1]}}} 

这是我的

I want to create the following layout in Jetpack compose.

I've tried creating two lists inside a vertical scrollable Box but that's not possible as I got the this error: "java.lang.IllegalStateException: Nesting scrollable in the same direction layouts like ScrollableContainer and LazyColumn is not allowed. If you want to add a header before the list of items please take a look on LazyColumn component which has a DSL api which allows to first add a header via item() function and then the list of items via items()."

I've tried creating two different lists inside a parent list by using the following code, but that doesn't work either.

@Composable
fun MainList() {
    LazyColumn() {
        
        item {
            /* LazyRow code here */
        }
        
        item {
            /* LazyColumn code here */
        }
    }
}

Now I'm clueless about what else could I try to achieve two lists (one vertical and one horizontal) on the same activity and keep the activity vertically scrollable too.

解决方案

I think the best option, would be if the LazyVerticalGrid allows some sort of expand logic on each item, but looks like it's not supported yet (beta-03).

So I'm leaving here my solution using one single LazyColumn for the entire list and LazyRow for "My Books" section.

LazyColumn(
    modifier = Modifier.fillMaxSize(),
) {
    // My Books section
    item {
        Column(modifier = Modifier.fillMaxWidth()) {
            Text("My Books")
            LazyRow {
                items(books) { item ->
                    // Each Item
                }
            }
        }

    }
    // Whishlisted Books title
    item {
        Text("Whishlisted Books", style = MaterialTheme.typography.h4)
    }
    // Turning the list in a list of lists of two elements each
    items(wishlisted.windowed(2, 2, true)) { item ->
        Row {
            // Draw item[0]
            // Draw item[1]
        }
    }
}

Here is my gist with the full solution and the result is listed below.

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