How to serialize null value when using Parcelable interface

Question

regarding my code example down, what shold I do if one Locable's variables is null? In example, now if l.getZoom() returns null, I got NullPointerException.

@Override public void writeToParcel(Parcel parcel, int arg1) {     parcel.writeInt(count);     for(Locable l:locableArr){         parcel.writeInt(l.getOriginId());         parcel.writeInt(l.getLocableType());         parcel.writeInt(l.getZoom());         parcel.writeDouble(l.getLatituda());         parcel.writeDouble(l.getLongituda());         parcel.writeString(l.getTitle());         parcel.writeString(l.getSnipet());     }  } 

Thanks!

Answer 1

You can use Parcel.writeValue for marshalling generic object with null value.

Answer 2

I'm using a Parcelable class that has Integer and Boolean fields as well, and those fields can be null.

I had trouble using the generic Parcel.writeValue method, particularly when I was trying to read it back out via Parcel.readValue. I kept getting a runtime exception that said it couldn't figure out the type of the parceled object.

Ultimately, I was able to solve the problem by using Parcel.writeSerializable and Parcel.readSerializable with a type cast, as both Integer and Boolean implement the Serializable interface. The read and write methods handle null values for you.