Write in parcer nullable value in kotlin

This largely depends on what is the semantics of null as a value of your nullable property. It can mean:

If value is null then it is absent and should not be written at all:
```
value?.let { writeInt(it) }
```
Of course, the Parcel receiver should be able to determine if it should read the value or not, this should be clear from the values written earlier.
value is provided by some code, and it is an error if it is null at the point where it should be written:
```
check(value != null) { "value should be not null at the point it's wriiten" }
writeInt(value!!)
```
Also, in this case, consider using lateinit var instead of nullable property.
Some default value should be used instead of value:
```
writeInt(value ?: someDefaultValue())
```
With Parcel, this does make sense, because otherwise, if the value is missing, you have to specify the fact somewhere else.
... (null can actually mean many things)

Also, this answer shows many idiomatic ways of dealing with nullable values, and you might find some of them useful.

Resolved by:

source.readValue(Int::class.java.classLoader) as Int?,
dest.writeValue(value)

Related