Kotlin extensions for Android: How to use bundleOf

Question

Documentation says:

fun bundleOf(vararg pairs: Pair<String, Any?>): Bundle

Returns a new Bundle with the given key/value pairs as elements.

I tried:

   val bundle = bundleOf {
       Pair("KEY_PRICE", 50.0)
       Pair("KEY_IS_FROZEN", false)
   }

But it is showing error.

Todd · Accepted Answer · 2020-01-07T13:41:04.590

33

If it takes a vararg, you have to supply your arguments as parameters, not a lambda. Try this:

val bundle = bundleOf(
               Pair("KEY_PRICE", 50.0),
               Pair("KEY_IS_FROZEN", false)
             )

Essentially, change the { and } brackets you have to ( and ) and add a comma between them.

Another approach would be to use Kotlin's to function, which combines its left and right side into a Pair. That makes the code even more succinct:

val bundle = bundleOf(
    "KEY_PRICE" to 50.0,
    "KEY_IS_FROZEN" to false
)

edited Jan 07 '20 at 13:41

answered Mar 17 '18 at 23:23

Todd

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Does this auto converts or check if the variable is `Parcelable` or not? – Rishabh Deep Singh Aug 10 '21 at 18:24

score 12 · Answer 2 · answered Mar 18 '18 at 06:55

12

How about this?

val bundle = bundleOf (
   "KEY_PRICE" to 50.0,
   "KEY_IS_FROZEN" to false
)

to is a great way to create Pair objects. The beauty of infix function with awesome readability.

answered Mar 18 '18 at 06:55

Chandra Sekhar

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I have added the plugin `apply plugin: 'kotlin-android-extensions'` , but `bundleOf()` doesn't resolve itself. Is there something else to set up? – Etienne Lawlor Sep 07 '18 at 06:17
bundleOf has nothing to do with android-kotlin-extension. It is part of core library. Ideally it should be available. – Chandra Sekhar Sep 07 '18 at 08:56
3

@toobsco42 bundleOf is part of the Android KTX extension functions. Check out the docs here: https://developer.android.com/kotlin/ktx (it's in the androidx.core.os package) – sbearben Nov 28 '18 at 17:37
@toobsco42 change bndleOf import to "androidx.core.os.bundleOf" – Oleksandr Bodashko Feb 13 '19 at 18:24

score 11 · Answer 3 · answered Feb 20 '19 at 20:14

11

Just to complete the other answers:

First, to use bundleOf, need to add implementation 'androidx.core:core-ktx:1.0.0' to the build.gradle then:

var bundle = bundleOf("KEY_PRICE" to 50.0, "KEY_IS_FROZEN" to false)

answered Feb 20 '19 at 20:14

A-Sharabiani

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Kotlin extensions for Android: How to use bundleOf

3 Answers3