CODEWITHSUNDEEP
androidgenericskotlin
Angelina
Angelina

Reputation: 1563

Kotlin: check class type in a function

I want to have a list of Activities and I want to loop through it to check if the current Activity is of this type then do something.

Current code:

if (activity is ActivityA || activity is ActivityB || activity is ActivityC) dosmth()

How to create an ArrayList of these activities and loop through them in a method? I have a difficulty determining the Type which should be used.

Upvotes: 0

Views: 499

Answers (2)

Alexey Romanov
Alexey Romanov

Reputation: 170723

I'd consider writing your code as

when(activity) {
    is ActivityA, is ActivityB, is ActivityC -> dosmth()
}

If you do want a collection (e.g. because the list of classes may depend on something) you can write

val activityClasses = listOf(ActivityA::class, ActivityB::class, ActivityC::class).map { it.java }

if (activityClasses.any { it.isInstance(activity) }) {
    doSmth()
}

Upvotes: 1

shkschneider
shkschneider

Reputation: 18243

Just to repeat less code, I used:

if (activity::class in setOf(ActivityA::class, ActivityB::class, ActivityC::class)) {
    dosmth()
}

Upvotes: 2

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