CODEWITHSUNDEEP
arrayskotlin
Swallacova
Swallacova

Reputation: 37

Kotlin array In array?

I want to make a array in array and get one by index form in Kotlin.

for example, I make a this array [ (1, 12(real data is Bitmap)) , (2, 24(same)), (3, 36) ]

so I can get array(index) = 12

how can I make this form of array and get data by index like above?

Upvotes: 0

Views: 832

Answers (2)

Willi Mentzel
Willi Mentzel

Reputation: 29844

If you just want an array of bytes, use byteArrayOf:

val array = byteArrayOf(12, 24, 36)
println(array[0]) // 12

ByteArray is the equivalent of Java's byte[].

Note: There is also intArrayOf, floatArrayOf, doubleArrayOf etc.

Since you asked for an array in an array as well:

val arrayOfArrays = arrayOf(byteArrayOf(1, 2, 3), byteArrayOf(24), byteArrayOf(36))
println(arrayOfArrays[0][1]) // 2

In this case the type of arrayOfArrays will be Array<ByteArray> and you need arrayOf to construct that.

Upvotes: 0

Sergio
Sergio

Reputation: 30605

Maybe Map is what you need:

val map = mapOf(1 to 12, 2 to 24, 3 to 36)
val twelve = map[1]

It is a collection that holds pairs of objects (keys and values) and supports efficiently retrieving the value corresponding to each key.

To add data to a map we can use mutableMapOf function:

val map = mutableMapOf<Int, Bitmap>()
val bitmap: Bitmap = ...
map[4] = bitmap

Upvotes: 1

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