Kotlin序列化:找不到"UUID"类型的序列化器 [英] Kotlin serialization: Serializer has not been found for type 'UUID'

问题描述

我正在使用Kotlin序列化来序列化包含UUID字段的自定义类型

I am using Kotlin Serialization to serialize a custom type which contains a UUID field

@Serializable
data class MyDataClass {
    val field1: String,
    val field2: UUID
}

我遇到以下错误，不知道该怎么办:

I got the following error and did not know what to do:

Serializer has not been found for type 'UUID'. To use context serializer as fallback, explicitly annotate type or property with @Contextual

推荐答案

遵循部分，我意识到我必须编写一个看起来像这样的对象才能真正帮助UUID序列化/反序列化，即使UUID已经实现了java.io.Serializable:

After following the Kotlin Custom Serializer section of the Kotlin Serialization Guide, I realized I had to write an object that looks like this to actually help the UUID serialize/ deserialize, even though UUID already implements java.io.Serializable:

object UUIDSerializer : KSerializer<UUID> {
        override val descriptor = PrimitiveSerialDescriptor("UUID", PrimitiveKind.STRING)

        override fun deserialize(decoder: Decoder): UUID {
                return UUID.fromString(decoder.decodeString())
        }

        override fun serialize(encoder: Encoder, value: UUID) {
                encoder.encodeString(value.toString())
        }
}

// And also update the original data class:
@Serializable
data class FaceIdentifier(
        val deviceId: String,
        @Serializable(with = UUIDSerializer::class)
        val imageUUID: UUID,
        val faceIndex: Int
)

事实证明，我必须针对多种类型执行此操作:例如Rect，Uri，所以如果可能的话，我将使用Java序列化...如果您知道更简单的方法，请告诉我.

Well it turns out I have to do this for a lot of types: e.g. Rect, Uri, so I will be using Java serialization if possible... Let me know if you know a simpler way.

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