setSingleChoiceItems of ParcelableArray (Kotlin)

Question

have a code: 
  
 val booksForDelete = arguments?.getParcelableArray("books")

  val builder = AlertDialog.Builder(activity)
        val checkedItem = -1

        builder.setTitle("Choose the book for DELETE")
        
            .setSingleChoiceItems(booksForDelete?.**map**(Book::title)?.toTypedArray(),checkedItem){dialog, which ->
                Toast.makeText(activity,"Choosen book: ${booksForDelete?.map { Book::title}?.get(which)}",Toast.LENGTH_SHORT).show()
            }

in the line ".setSingleChoiceItems..." a have a mistake - "map" marked. What's wrong?

P.S.

data class Book(val title: String, val id: Int) : Parcelable {
constructor(source: Parcel) : this(
        source.readString()!!,
        source.readInt()
)

score 0 · Answer 1 · answered Jul 13 '20 at 10:03

0

The expression booksForDelete?.map(Book::title)?.toTypedArray() is syntactically correct. However usually it's written in a more 'kotlin'-ic form:

booksForDelete?.map { it.title }?.toTypedArray()

answered Jul 13 '20 at 10:03

user3159253

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@Дмитрий Unfortunately, you don't provide any additional info regarding the error: what kind of error, what you expect to get and what you actually get and so on and so forth. I guess you're using an IDE like Intellij Idea: what does it say on the line? – user3159253 Jul 14 '20 at 05:13
thanks for answer. i take two arrays and solve my problem – Дмитрий Jul 14 '20 at 08:59

score 0 · Answer 2 · answered Jul 13 '20 at 14:39

0

Please try to cast your Parcelable array to Array<Book>:

@Suppress("UNCHECKED_CAST") 
val booksForDelete = arguments?.getParcelableArray("books") as? Array<Book>

answered Jul 13 '20 at 14:39

Sergio

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setSingleChoiceItems of ParcelableArray (Kotlin)

2 Answers2