Question

我有几个活动，我使用Intents在它们之间传递数据。我想从第一个活动传递我的自定义对象的数组，并使其成为第二个活动中的arraylist。我的代码是：

data class Attachment(val Name: String, val Content: String)

class ActivityA {
    private var attachments: Array<Attachment> = arrayOf()
    fun callB() {
        intent = Intent(this,ActivityB::class.java).apply {
            putExtra("Attachments", attachments)
        }
    }
}

class ActivityB {
    private var attachments: ArrayList<Attachment>?

    override fun onCreate(savedInstanceState: Bundle?) {
        // How do I get the passed array and store in the arraylist here ?

        val a: Array<Attachment> = intent.getParcelableArrayExtra("Attachments") as Array<Attachment>
        attachments = a // fails with a type mismatch error
        attachments = ArrayList(a) // fails again
        attachments = intent.get????????("Attachments") // any such option ?
    }
}

现在我的问题是，将ActivityA中的attachments数组提供给ActivityB中attachments数组列表的最有效方法是什么？

Answer 1

答案很简单。

data class Attachment(val Name: String, val Content: String) : Serializable

// In ActivityB
val a: Array<SecretJSON.Attachment> = intent.getSerializableExtra("Attachments") as Array<Attachment>
attachments = a.toCollection(ArrayList())

Kotlin通过Intents传递自定义对象数组并作为ArrayList接收

1 个答案: