CODEWITHSUNDEEP
kotlinarraylistcastingany
Terry
Terry

Reputation: 117

Kotlin Check and access a class from List<Any>

How can you check and access adViewClass from the array of Any?

val adViewClass = AddViewClass(name = "an instance")
val elements = listOf("trevor", "john", adViewClass, "0goo")

How to get that adViewClass from list

Upvotes: 1

Views: 878

Answers (2)

Mahdi-Malv
Mahdi-Malv

Reputation: 19220

You can get all instances of a specific class that are in a list using the filterIsInstance(Class<>)

val elements: List<Any> = listOf<Any>("trevor", "john", AdViewClass, "0goo")
val listOfAdViewClass = elements.filterIsInstance(AdViewClass::class.java)

The filtered list will contain all instances of that class in the list.

Upvotes: 4

Ori Marko
Ori Marko

Reputation: 58772

You can use simple elementAt to get class

elements.elementAt(2)

elementAt() is useful for collections that do not provide indexed access, or are not statically known to provide one. In case of List, it's more idiomatic to use indexed access operator (get() or []).

and check class using is

if (obj is AdViewClass) {

We can check whether an object conforms to a given type at runtime by using the is operator

Upvotes: 1

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