How to serialize null value when using Parcelable interface
You can use Parcel.writeValue for marshalling generic object with null value.
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.
This is the solution I came up with to write strings safely:
private void writeStringToParcel(Parcel p, String s) { p.writeByte((byte)(s != null ? 1 : 0)); p.writeString(s);}private String readStringFromParcel(Parcel p) { boolean isPresent = p.readByte() == 1; return isPresent ? p.readString() : null;}