删除Gson中的空数组 [英] Delete empty arrays in Gson

问题描述

我阅读了 Android GSON反序列化删除空数组之类的主题， https://medium.com/@int02h/custom-deserialization-with-gson -1bab538c0bfa ，例如，我有一个课:

data class ViewProfileResponse(
    val success: Int,
    val wallets: List<Wallet>?,
    val contact: Contact?,

    val code: Int,
    val errors: ErrorsResponse?
) {

    data class Contact(
        val countryId: Int,
        val regionId: Int,
        val cityId: Int
    )

    data class Wallet(
        val id: Int,
        val currency: String?,
        val createTime: Int,
        val balance: Float,
        val bonusWallet: BonusWallet?
    ) {

        data class BonusWallet(val id: Int, val balance: Float)
    }

    data class ErrorsResponse(val common: List<String>?)

    class Deserializer : ResponseDeserializable<ViewProfileResponse> {
        override fun deserialize(content: String): ViewProfileResponse? =
            Gson().fromJson(content, ViewProfileResponse::class.java)
    }
}

如您所见，我有一个带有子类的复杂类，每个子类都可以为null.但是，服务器不是在这些字段中发送null或{}，而是在JSON中发送[].

As you see, I have a complex class with subclasses, any of each can be null. But instead of sending null or {} in these fields, a server sends [] in JSON.

我的意思是，我得到的不是"contact": null.

I mean, instead of "contact": null I get "contact": [].

如何为Gson编写自定义解串器?这样可以删除空数组，但保留其他类型.我有几十个这样的课程.

How to write a custom deserializer for Gson? So that empty arrays could be removed, but other types retain. I have tens of those classes.

推荐答案

临时解决方案基于 https://stackoverflow.com /a/54709501/2914140 .

在这种情况下，反序列化器将如下所示:

In this case Deserializer will look like:

class Deserializer : ResponseDeserializable<ViewProfileResponse> {

    private val gson = Gson()
    private val gsonConverter = GsonConverter()

    override fun deserialize(content: String): ViewProfileResponse? =
        gson.fromJson(gsonConverter.cleanJson(content), ViewProfileResponse::class.java)
}

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