jetpack compose LazyLayout 参数未指定

Question

我想在 jetpack compose

中开发一个 LazyLayout

@ExperimentalFoundationApi
@Composable
fun LazyLayout(
    itemsProvider: LazyLayoutItemsProvider!,
    modifier: Modifier! = Modifier,
    prefetchState: LazyLayoutPrefetchState? = null,
    measurePolicy: (@ExtensionFunctionType LazyLayoutMeasureScope.(Constraints) -> 
MeasureResult)?
): Unit

有两个必要的参数，itemsProvider和measurePolicy，这是文档中关于itemsProvider参数的所有信息：

@param itemsProvider provides all the needed info about the items which could be used to compose and measure items as part of [measurePolicy].

我不知道如何为LazyLayout提供这个参数。

知道它是如何工作的吗？

Answer 1

您必须像这样创建对象来仅提供“itemsProvider”参数：

LazyLayout(
    itemsProvider = object : LazyLayoutItemsProvider {
        override fun getContent(index: Int): @Composable () -> Unit {
            return {
                //your content
            }
        }

        override val itemsCount: Int
            get() = //count content

        override fun getKey(index: Int): Any = index
        override val keyToIndexMap: Map<Any, Int> = emptyMap()
        override fun getContentType(index: Int): Any? = null
    },
    //modifier = modifier
        //.padding(paddingValues)
        //.verticalScroll(state = state, flingBehavior = NoFlingBehavior)
) { constraints -> 
  //do whatever you want
}

jetpack compose LazyLayout 参数未指定

jetpack compose LazyLayout parameters in not Specified

android-jetpack-compose