java - 在日期结束后在列表 kotlin 中添加值

Question

嘿，我正在努力通过 enum 类创建类型为 INCOMING、OUTGOING 和 TIME 的列表。我的数据类是通过 api 调用填充的，并根据列表中的填充。我想修改以在当前日期结束时添加 TIME 枚举值。

fun main() {
    val list = mutableListOf(
        Conversation(ConversationType.INCOMING.value, Sender(1, "2021/10/12")),
        Conversation(ConversationType.INCOMING.value, Sender(2, "2021/10/12")),
        Conversation(ConversationType.OUTGOING.value, Sender(3, "2021/10/11")),
        Conversation(ConversationType.OUTGOING.value, Sender(4, "2021/10/11")),
        Conversation(ConversationType.OUTGOING.value, Sender(5, "2021/10/11")),
        Conversation(ConversationType.OUTGOING.value, Sender(6, "2021/10/09")),
        Conversation(ConversationType.INCOMING.value, Sender(7, "2021/10/09")),
        Conversation(ConversationType.INCOMING.value, Sender(8, "2021/10/09")),
        Conversation(ConversationType.INCOMING.value, Sender(9, "2021/10/09")),
        Conversation(ConversationType.OUTGOING.value, Sender(10, "2021/10/08")),
        Conversation(ConversationType.OUTGOING.value, Sender(11, "2021/10/07"))
    )
}

枚举类

enum class ConversationType(val value: Int) {
    INCOMING(1),
    TIME(0),
    OUTGOING(2);
}

data class Conversation(
    val type: Int? = null,
    val sender: Sender
)

data class Sender(
    val id: Int? = null,
    val date: String? = null
)

我需要这样的输出

Conversation(type=1, sender=Sender(id=1, date=2021/10/12))
Conversation(type=1, sender=Sender(id=2, date=2021/10/12))
Conversation(type=0, sender=Sender(id=null, date=2021/10/12))
Conversation(type=2, sender=Sender(id=3, date=2021/10/11))
Conversation(type=2, sender=Sender(id=4, date=2021/10/11))
Conversation(type=2, sender=Sender(id=5, date=2021/10/11))
Conversation(type=0, sender=Sender(id=null, date=2021/10/11))
Conversation(type=2, sender=Sender(id=6, date=2021/10/09))
Conversation(type=1, sender=Sender(id=7, date=2021/10/09))
Conversation(type=1, sender=Sender(id=8, date=2021/10/09))
Conversation(type=1, sender=Sender(id=9, date=2021/10/09))
Conversation(type=0, sender=Sender(id=null, date=2021/10/09))
Conversation(type=2, sender=Sender(id=10, date=2021/10/08))
Conversation(type=0, sender=Sender(id=null, date=2021/10/08))
Conversation(type=2, sender=Sender(id=11, date=2021/10/07))
Conversation(type=0, sender=Sender(id=null, date=2021/10/07))

Answer 1

据我了解你想要什么，你需要这样的东西:

var previousDate: String? = null
var i = -1
while (i < list.size) {
    i++
    val currentDate = list[i].date
    previousDate?.let {
        if (currentDate != previousDate) {
            list.add(i + 1, Conversation(ConversationType.TIME.value, Sender(null, it)))
        }
    }
    previousDate = currentDate
}