What is the purpose of the kotlin/ folder inside an Android apk?

Question

I've built an Android project with Kotlin support. I've used APK analyser on the resulting APK and noticed it contains a folder named kotlin/ outside classes.dex:

Looks like there are .class files inside the folder.

Anyone can explain what is the purpose of that folder? Shouldn't all bytecode be translated into .dex?

score 1 · Accepted Answer · answered Feb 14 '18 at 17:48

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Quoting from this answer,

These files contain data for declarations of standard ("built-in") Kotlin classes which are not compiled to .class files, but rather are mapped to the existing types on the platform (in this case, JVM). For example, kotlin/kotlin.kotlin_builtins contains the information for non-physical classes in package kotlin: Int, String, Enum, Annotation, Collection, etc.

answered Feb 14 '18 at 17:48

karandeep singh

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Why quote an exact answer instead of flagging as a duplicate though? – zsmb13 Feb 14 '18 at 19:08
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May be the answer was similar, but the question seemed to be a little different to me. – karandeep singh Feb 14 '18 at 19:09

What is the purpose of the kotlin/ folder inside an Android apk?

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