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Re:Ask HN: Any good book for Kotlin Android development? by fakeElonMusk on Wednesday July 17, 2019 @05:58AM (#20457906)
Check Kotlin lang and google docs - there are online courses there as well as books:

https://developer.android.com/kotlin

https://kotlinlang.org/docs/reference/android-overview.html

Re:Ask HN: Any good book for Kotlin Android development? by kuu on Thursday July 18, 2019 @06:10AM (#20468337)
Thanks I will check them!