尝试调用接口方法'；int java.util.List.size（）'；在传递Parcelable in Intent Kotlin时的空对象引用上

因此，我有一个示例应用程序，目前正在使用改造获取数据，并使用其自定义适配器将其显示在recyclerview中。当我在我的回收视图上单击字符名称时，我想将数据传递到“更多详细信息”页面。我找到了一些教程，并决定像这样使用Parcelize注释：

@Parcelize data class Character (
val charID: Long,
val name: String,
val birthday: String,
val occupation: List<String>,
val img: String,
val status: String,
val nickname: String,
val appearance: List<Long>,
val portrayed: String,
val category: String,
val betterCallSaulAppearance: List<Long> ) : Parcelable

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    val character = characters[position]
    holder.characterNameText.text = character.name

    holder.characterNameText.setOnClickListener {
        holder.passData(character)
    }
}

override fun getItemCount() = characters.size


class ViewHolder(itemView : View) : RecyclerView.ViewHolder(itemView) {
    val characterNameText = itemView.findViewById<TextView>(R.id.character_name)

    fun passData(character : Character) {
        val intent = Intent(itemView.context, CharacterDetails::class.java)
        intent.putExtra(CHARACTER, character)
        itemView.context.startActivity(intent)
    }



}

companion object {
    const val CHARACTER = "character"
}
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_character_details)

    val bundle = intent.extras
    val character = bundle!!.getParcelable<Character>(CHARACTER)


    val characterName = findViewById<TextView>(R.id.character_details_name)

@Parcelize数据类字符(
瓦尔·查里德：很长，
val name:String，
瓦尔生日：字符串，
val职业：列表，
val img:String，
val状态：字符串，
val昵称：String，
val外观：列表，
瓦尔：弦，
val类别：字符串，
val BETTERCALL SAULAPEARANCE:列表）：可包裹

我的适配器如下所示：

@Parcelize data class Character (
val charID: Long,
val name: String,
val birthday: String,
val occupation: List<String>,
val img: String,
val status: String,
val nickname: String,
val appearance: List<Long>,
val portrayed: String,
val category: String,
val betterCallSaulAppearance: List<Long> ) : Parcelable

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    val character = characters[position]
    holder.characterNameText.text = character.name

    holder.characterNameText.setOnClickListener {
        holder.passData(character)
    }
}

override fun getItemCount() = characters.size


class ViewHolder(itemView : View) : RecyclerView.ViewHolder(itemView) {
    val characterNameText = itemView.findViewById<TextView>(R.id.character_name)

    fun passData(character : Character) {
        val intent = Intent(itemView.context, CharacterDetails::class.java)
        intent.putExtra(CHARACTER, character)
        itemView.context.startActivity(intent)
    }



}

companion object {
    const val CHARACTER = "character"
}
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_character_details)

    val bundle = intent.extras
    val character = bundle!!.getParcelable<Character>(CHARACTER)


    val characterName = findViewById<TextView>(R.id.character_details_name)

覆盖BindViewHolder（holder:ViewHolder，position:Int）{
val字符=字符[位置]
holder.characterNameText.text=character.name
holder.characterNameText.setOnClickListener{
持有者.密码数据（字符）
}
}
重写fun getItemCount（）=characters.size
类ViewHolder（itemView:View）：RecyclerView.ViewHolder（itemView）{
val characterNameText=itemView.findviewbyd（R.id.character\u name）
fun passData（字符：字符）{
val intent=intent（itemView.context，CharacterDetails:：class.java）
intent.putExtra（字符，字符）
itemView.context.startActivity（意图）
}
}

在CharacterDetails活动中，如下所示：

@Parcelize data class Character (
val charID: Long,
val name: String,
val birthday: String,
val occupation: List<String>,
val img: String,
val status: String,
val nickname: String,
val appearance: List<Long>,
val portrayed: String,
val category: String,
val betterCallSaulAppearance: List<Long> ) : Parcelable

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    val character = characters[position]
    holder.characterNameText.text = character.name

    holder.characterNameText.setOnClickListener {
        holder.passData(character)
    }
}

override fun getItemCount() = characters.size


class ViewHolder(itemView : View) : RecyclerView.ViewHolder(itemView) {
    val characterNameText = itemView.findViewById<TextView>(R.id.character_name)

    fun passData(character : Character) {
        val intent = Intent(itemView.context, CharacterDetails::class.java)
        intent.putExtra(CHARACTER, character)
        itemView.context.startActivity(intent)
    }



}

companion object {
    const val CHARACTER = "character"
}
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_character_details)

    val bundle = intent.extras
    val character = bundle!!.getParcelable<Character>(CHARACTER)


    val characterName = findViewById<TextView>(R.id.character_details_name)

伴生对象{
const val CHARACTER=“CHARACTER”
}
重写创建时的乐趣（savedInstanceState:Bundle？）{
super.onCreate（savedInstanceState）
setContentView（R.layout.activity\u character\u详细信息）
val bundle=intent.extras
val character=bundle！！.getParcelable（字符）
val characterName=findviewbyd（R.id.character\u details\u name）

但我得到了一份工作

java.lang.NullPointerException：尝试对空对象引用调用接口方法“int java.util.List.size（） 位于com.example.myapplication.models.Character.writeToParcel（未知来源：85）

---

我还是新手，所以我真的需要你的帮助。谢谢！

显然，数据类的列表引用导致的错误为空。你可以这样修改代码

@Parcelize数据类字符(
瓦尔·查里德：很长，
val name:String，
瓦尔生日：字符串，
val职业：列表？，
val img:String，
val状态：字符串，
val昵称：String，
val外观：列表？，
瓦尔：弦，
val类别：字符串，
val BETTERCALL SAULAPEARANCE:列表？：可包裹

哇，谢谢你的救命恩人！