Kotlin数据类中的函数作为参数导致包裹错误 [英] Function in Kotlin data class as argument leads to parceling error

问题描述

我在Kotlin帽子中有一个数据类，它正在使用@Parcelize批注来简化打包过程.现在，我想将一个函数传递给此类，并且我真的不知道如何在打包过程中不考虑该函数.

I have a data class in Kotlin hat is using the @Parcelize annotation for easy parcelization. Thing is I now want to pass a function to this class and I do not really know how to make the function not be considered during parceling.

这是我的数据类:

@Parcelize
data class GearCategoryViewModel(
        val title: String,
        val imageUrl: String,
        val categoryId: Int,
        val comingSoon: Boolean,
        @IgnoredOnParcel val onClick: (gearCategoryViewModel: GearCategoryViewModel) -> Unit
) : DataBindingAdapter.LayoutViewModel(R.layout.gear_category_item), Parcelable

我尝试使用@IgnoredOnParcel和@Transient失败.

这是我得到的编译错误:

This is the compile error I get:

错误:(20，39)'Parcelize'不直接支持类型.如果希望使用'writeValue()'对参数类型进行序列化，请使用'@RawValue'注释参数类型.

Error:(20, 39) Type is not directly supported by 'Parcelize'. Annotate the parameter type with '@RawValue' if you want it to be serialized using 'writeValue()'

并且此@RawValue注释也不起作用.

And this @RawValue annotation does not work either.

推荐答案

只需将lambda转换为可序列化的对象，然后从

Just cast lambda to serializable, and then create object from

@Parcelize
data class GearCategoryViewModel(
        val title: String,
        val imageUrl: String,
        val categoryId: Int,
        val comingSoon: Boolean,
        @IgnoredOnParcel val onClick: Serializable
) : DataBindingAdapter.LayoutViewModel(R.layout.gear_category_item), Parcelable {

    fun onClicked() = onClick as (gearCategoryViewModel: GearCategoryViewModel) -> Unit

    companion object {
        fun create(
                title: String,
                imageUrl: String,
                categoryId: Int,
                comingSoon: Boolean,
                onClick: (gearCategoryViewModel: GearCategoryViewModel) -> Unit
        ): GearCategoryViewModel = GearCategoryViewModel(
                title,
                imageUrl,
                categoryId,
                comingSoon,
                onClick as Serializable
        )
    }
}

这篇关于Kotlin数据类中的函数作为参数导致包裹错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！