Android kotlin SimpleXmlConverterFactory 在读取属性时崩溃

Question

我正在尝试用 Retrofit2 和 SimpleXmlConverterFactory 解析 XML，这一直有效，直到我尝试读取一个节点的属性，在那里，它崩溃了，没有日志。

我的 XML :

<HotelSearchRES>
  <Destination id="1">Tunisie</Destination>
  <City id="104">Hammamet</City>
  <Currency>1</Currency>
  <Language>1</Language>
  <FromDate>01/12/2021</FromDate>
  <ToDate>02/12/2021</ToDate>
</HotelSearchRES>

我的类 :

@Root(name = "HotelSearchRES", strict = false)
class SearchResultsWrapper @JvmOverloads constructor() {
    @Element(name = "Destination")
    var destination: Destination? = null

    @set:Element(name = "City")
    @get:Element(name = "City")
    var city: String? = null


    @set: Element(name = "Currency")
    @get: Element(name = "Currency")
    var currency: Int? = null

    @set: Element(name = "Language")
    @get: Element(name = "Language")
    var language: Int? = null

    @set: Element(name = "FromDate")
    @get: Element(name = "FromDate")
    var fromDate: String? = null

    @set: Element(name = "ToDate")
    @get: Element(name = "ToDate")
    var toDate: String? = null

}

class Destination(){
    @Attribute(required = false)
    val id: String? = null

    @Text(required = false)
    val destination: String? = null
}

问题接缝与属性读取有关，所以如果我删除第一行，一切正常：

@Element(name = "Destination")
    var destination: Destination? = null

如有任何帮助，我们将不胜感激 ;)

Answer 1

在 Kotlin 中，字段仅用作属性的一部分以将其值保存在内存中。不能直接声明字段。但是，当属性需要一个支持字段时，Kotlin 会自动提供它。可以使用 field 标识符

在访问器中引用此支持字段

做类似的事情：

 @field:Element(name = "Destination")
 var destination: Destination? = null

顺便说一下，您不需要对属性执行 @get、@set，您可以使用 @field

请参阅 this or here Annotations 了解详细答案

Answer 2

好的，对于那些搞乱解析属性的人，这里是正确的 class 注释：

@Root(name = "HotelSearchRES", strict = false)
class HotelSearchRES @JvmOverloads constructor(){
    @field:Element(name = "Destination") var destination: Destination? = null
    @field:Element(name = "City") var city: City? = null
    @field:Element(name = "Currency") var currency: Int = 0
    @field:Element(name = "Language") var language: Int = 0
    @field:Element(name = "FromDate") var fromDate: String? = null
    @field:Element(name = "ToDate") var toDate: String? = null

}

@Root(name = "Destination", strict = false)
class Destination {
    @field:Attribute(name = "id", required = false) var id: Int = 0
    @field:Text var text: String? = null
}

@Root(name = "City", strict = false)
class City {
    @field:Attribute(name = "id", required = false) var id: Int = 0
    @field:Text var text: String? = null
}

感谢@MG1616 的技巧

Android kotlin SimpleXmlConverterFactory 在读取属性时崩溃

Android kotlin SimpleXmlConverterFactory crashes when reading attributes

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