How to read sealed class subclass in Kotlin?-CodePudding

In my Android studio project, I have a construct like following:

@Stable
interface Levels {

    @Immutable
    sealed class LevelData {

        object Empty : LevelData()

        @Immutable
        data class L1(
            val locationData: Locations.LocationData.StageL1
        ) : LevelData()
    }
}

In another class I have val levelData = mutableStateOf<Levels.LevelData>(Levels.LevelData.Empty) variable with Empty as its default. Then the state changes and I would like to access the locationData in levelData like levelData.value.locationData?

Autocomplete in Android Studio does not show me any locationData member access in the drop down?!?

CodePudding user response：

Your levelData variable holds mutable state of super type Levels.LevelData. You need to cast the object to L1 to access locationData

val value = levelData.value
if(value is Levels.LevelData.L1){
    val locationData = value.locationData
    //perform action on locationData
}