How to implement Parcelable on my class which contains an ArrayList<String>?

Question

I just want to know how to read and write the ArrayList. I use Kotlin.

data class CustomerTxn(

    @field:SerializedName("txn_note")
    val txnNote: String? = null,

    @field:SerializedName("txn_date")
    val txnDate: String? = null,

    @field:SerializedName("amount")
    val amount: String? = null,

    @field:SerializedName("txn_type")
    val txnType: String? = null,

    @field:SerializedName("contact")
    val contact: String? = null,

    @field:SerializedName("transaction_images")
    var transactionImages: ArrayList<String>? = null,

    @field:SerializedName("created_at")
    val createdAt: String? = null,

    @field:SerializedName("cashbook")
    val cashbook: String? = null,

    @field:SerializedName("view_type")
    val viewType: String? = null,

    @field:SerializedName("id")
    val id: String? = null,

    @field:SerializedName("modified_at")
    val modifiedAt: String? = null
    ):Parcelable {
        constructor(parcel: Parcel) : this(
        parcel.readString(),
        parcel.readString(),
        parcel.readString(),
        parcel.readString(),
        parcel.readString(),
        parcel.readArrayList(null),
        parcel.readString(),
        parcel.readString(),
        parcel.readString(),
        parcel.readString(),
        parcel.readString()) {
}

override fun writeToParcel(parcel: Parcel, flags: Int) {
    parcel.writeString(txnNote)
    parcel.writeString(txnDate)
    parcel.writeString(amount)
    parcel.writeString(txnType)
    parcel.writeString(contact)
    parcel.writeList(transactionImages)
    parcel.writeString(createdAt)
    parcel.writeString(cashbook)
    parcel.writeString(viewType)
    parcel.writeString(id)
    parcel.writeString(modifiedAt)
}

override fun describeContents(): Int {
    return 0
}

companion object CREATOR : Parcelable.Creator<CustomerTxn> {
    override fun createFromParcel(parcel: Parcel): CustomerTxn {
        return CustomerTxn(parcel)
    }

    override fun newArray(size: Int): Array<CustomerTxn?> {
        return arrayOfNulls(size)
    }
}

These lines are giving me error :

parcel.readArrayList(null)
parcel.writeList(transactionImages)

The error for parcel.readArrayList(null) : Type mismatch. Required:ArrayList<String>? Found(ArrayList<Any!>?..ArrayList<*>?)

The error for parcel.writeList(transactionImages) : Java type mismatch expected (Mutable)List<(raw) Any?>! but found ArrayList<String>?. Use explicit cast

Answer 1

I'm using Java instead of Kotlin but I think this problem can handled by a same solution.

I often use:

• parcel.createStringArrayList() instead of parcel.readArrayList(null)
• parcel.writeStringList(transactionImages) instead of parcel.writeList(transactionImages)