Cannot use list in lazycolumn in kotlin

user_11560810 0
Viewed 107

I am using LazyColumn in project. When I am passing the list it giving me error. Can someone guide me what is the error?

ResultScreen.kt

@Composable
fun ResultScreen(nearestResultList: List<NearestResult>?) {
    LazyColumn(
        Modifier
            .fillMaxSize()
            .background(getBackgroundColor())
    ) {
        items(nearestResultList) { nearestResult ->
            Text(text = "$nearestResult")
        }
    }
}

Error

Type mismatch.
Required:
Int
Found:
List<NearestResult>?

enter image description here

UPDATE

enter image description here

lazycolumn android-jetpack android-jetpack-compose kotlin android
2 Answers

You were seeing that error because your nearestResultList is nullable and among the various signatures/overloads of the items(...) function, the signature items(size: Int, ...) was chosen as the "closest match".

The only thing that you need to do, to be able to use any of the items(...) signatures is a null check

import androidx.compose.foundation.lazy.items // or auto-fix imports

if (nearestResultList != null) {
    LazyColumn {
        items(nearestResultList) {
            Text(text = it.event, color = Color.White)
        }        
    }
}
user_24222240 
@Composable
fun ResultScreen(nearestResultList: List<NearestResult>?) {
    Column(
        Modifier
            .fillMaxSize()
            .background(getBackgroundColor())
    ) {
        LazyColumn {
            nearestResultList?.size?.let {
                items(it) { index ->
                    Text(text = nearestResultList[index].event, color = Color.White)
                }
            }
        }
    }
}
user_115608100
Related