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我正在尝试对问题类看起来像的问题数组列表进行编码：

import kotlinx.serialization.Serializable

@Serializable
data class Question(var id: Int?, var question: String, var 
answers:ArrayList<Answer>)

Answer 类如下所示：

import kotlinx.serialization.Serializable

@Serializable
data class Answer(var id:Int?, var answer: String, var rightAnswer: Boolean)

这是我试图对数组列表进行编码的代码：

val questionsJSON = Json.encodeToString(quiz.questions)

此代码导致以下错误：

Caused by: 
kotlinx.serialization.SerializationException: Serializer for class 'Question' is not found.
Mark the class as @Serializable or provide the serializer explicitly.

我应该提一下，我为获取 kotlinx-serialization 库所做的唯一一件事就是在 build.cradle 中添加依赖项，因为我不知道如何应用插件。

 //Kotlin serialization
implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.2")

更新：

我尝试将以下内容添加到我的 build.cradle 和 proguard-rules.pro 中，但我一直收到同样的错误。

build.cradle

plugins {
id 'com.android.application'
id 'kotlin-android'

id 'org.jetbrains.kotlin.plugin.serialization' version '1.5.20'
}

proguard-rules.pro

-keepattributes *Annotation*, InnerClasses
-dontnote kotlinx.serialization.AnnotationsKt # core 
serialization annotations

# kotlinx-serialization-json specific. Add this if you have 
java.lang.NoClassDefFoundError 
kotlinx.serialization.json.JsonObjectSerializer
-keepclassmembers class kotlinx.serialization.json.** {
*** Companion;
}
-keepclasseswithmembers class kotlinx.serialization.json.** {
kotlinx.serialization.KSerializer serializer(...);
}

# Change here com.yourcompany.yourpackage
-keep,includedescriptorclasses class 
eu.lucasblommers.quizapp.**$$serializer { *; } # <-- change package name to your app's
-keepclassmembers class eu.lucasblommers.quizapp.** { # <-- change package name to your app's
*** Companion;
}
-keepclasseswithmembers class eu.lucasblommers.quizapp.** { # <-- change package name to your app's
kotlinx.serialization.KSerializer serializer(...);
}
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