Attempt to invoke interface method 'int java.util.List.size()' on a null object reference on passing Parcelable in Intent Kotlin - kotlin

Question

So I have a sample app that is currently using Retrofit to fetch data and display it in a recyclerview with its custom adapter. I want to pass the data to the a more details page when I click on a character name on my recyclerView. I found some tutorials and decided to use the Parcelize annotation like this:
#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
My adapter looks like this:
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)
}
}
And in the CharacterDetails Activity it looks like this:
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)
Yet I get a
java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference
at com.example.myapplication.models.Character.writeToParcel(Unknown Source:85)
I'm still new to this so I really need your help.Thanks!

Answer 1

Obviously, the error caused by the list reference of the data class is null. You can modify the code like this.
#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