how to pass an arraylist of books between activities

Louisa Scheinost :

I have an arraylist of type Book. How can I pass the array list to another activity and read from that list in the other activity? Here's what I have so far.

   txtViewAll.setOnClickListener {
                Intent(context, BookActivity::class.java).apply {
                    putExtra("list", list[layoutPosition].list)
                    context.startActivity(this)
                }
            }

// to read

val bookList = intent.getStringArrayListExtra("list") as ArrayList<Book>
            for (book in bookList) {
                list.add(Book(book.id, book.title, book.image, book.subtitle, null, null, 0, 0));
            }

Here's each Book

data class Book(val id: String, val title: String, var image: String, var subtitle: String, var author: String?, var desc: String?, var uploadDate: Long,  var starCount: Long)

IntelliJ Amiya :

You can use putParcelableArrayListExtra & getParcelableArrayListExtra .

Set this way

Intent(context, BookActivity::class.java).apply {
putParcelableArrayListExtra("list", list[layoutPosition].list)
context.startActivity(this)

Get this way

val bookList = this.intent.getParcelableArrayListExtra<Parcelable>("list") as ArrayList<Book>

You should use Parcelable

• Use @Parcelize annotation on top of your Model / Data class

Example

@Parcelize
data class Book

Parcelable is an Android only interface which is used to serialize
class so its properties can be transferred from one activity to
another.