jetpack compose LazyLayout parameters in not Specified

Question

I want to develop a LazyLayout in jetpack compose

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

there is two necessary parameters, itemsProvider and measurePolicy and this is all information about itemsProvider parameter in document:

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

I don't know how to provide this parameter for LazyLayout.

any idea how it works?

Answer 1

You have to provide only "itemsProvider" parameter by creating object like this:

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
}