java.lang.RuntimeException: Parcel android.os.Parcel: Unmarshalling unknown type code

Question

I seem to be getting a strange error in my app (see GitHub), which occurs when I pass objects to different activities that implement Parcelable.

I have

Answer 1

Your problem is in LanguagesFlashCard. Here are your parcel/unparcel methods:

protected LanguagesFlashCard(Parcel in) {
    mId = in.readInt();
    mEnglish = in.readString();
    mAnswerPrefix = in.readString();
    mAnswer = in.readString();
    mTier = in.readInt();
    mTopic = in.readParcelable(Topic.class.getClassLoader());
}

As you can see, they don't match. The second item you write to the Parcel is an int, the second item you read from the Parcel is a String.

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeInt(mId);
    dest.writeInt(mTier);
    dest.writeString(mEnglish);
    dest.writeString(mAnswerPrefix);
    dest.writeString(mAnswer);
    dest.writeParcelable(mTopic, flags);
}

Answer 2

Kotlin code for sub data class like ImagesModel also parcelable used

data class MyPostModel(
    @SerializedName("post_id") val post_id: String? = "",
    @SerializedName("images") val images: ArrayList<ImagesModel>? = null
): Parcelable {
    constructor(parcel: Parcel) : this(
        parcel.writeString(post_id)
        parcel.createTypedArrayList(ImagesModel.CREATOR)
    )

    override fun writeToParcel(parcel: Parcel, flags: Int) {
        parcel.writeString(post_id)
        parcel.writeTypedList(images)
    }
}