Proguard Causing Runtimeexception (Unmarshalling Unknown Type Code) in Parcelable Class

Proguard causing RuntimeException (Unmarshalling unknown type code) in Parcelable class

As we found out in the comments, the exception was the result of ProGuard obfuscating Parcelable classes. The fix is to include this snippet in the ProGuard configuration file:

-keepclassmembers class * implements android.os.Parcelable {
    static ** CREATOR;
}

I guess the specific problem here was that ProGuard obfuscated the CREATOR member of PagerSlidingTabStrip, but since SavedState is a subclass of View.BaseSavedState, the superclass member was still available (this is why it didn't throw a BadParcelableException), but that uses a different data structure and didn't write the custom attributes into the Parcel output.

There is a recommended configuration for Android applications available in the ProGuard Manual, with detailed explanation about entries. For example, it includes that you should keep all class names used in the manifest or other XML files.

Android Parcelable: RuntimeException: Unmarshalling unknown type code

I would guess that this is happening when endDate == null in your Occurrence object. In this case, you're not writing a value to the Parcel, but the readFromParcel() method is still trying to read it.

Maybe something like the following will help:

private void readFromParcel(Parcel in)
{
    id = in.readInt();
    startDate = new Date(in.readLong());

    long date = in.readLong();
    if (date != 0L)
    {
        endDate = new Date(date);
    }
} 

public void writeToParcel(Parcel dest, int flags)
{ 
    dest.writeInt(id); 
    dest.writeLong(startDate.getTime());

    if (endDate != null)
    {
        dest.writeLong(endDate.getTime());
    }
    else
    {
        dest.writeLong(0L);
    }
}

How to fix Unmarshalling unknown type code XXX at offset YYY in Android?

It's because of Proguard obfuscation - it processed Parcelable.
solution: Proguard causing RuntimeException (Unmarshalling unknown type code) in Parcelable class

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

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);
}

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