I want to ignore a field when using the @Parcelize
annotation in Kotlin so that the field is not parceled, since this field does not implement the Parcelable
interface.
Starting with this, we get an error because PagedList
is not parcelable:
@Parcelize
data class LeaderboardState(
val progressShown: Boolean = true,
val pagedList: PagedList<QUser>? = null
) : Parcelable
Gives:
Type is not directly supported by 'Parcelize'. Annotate the parameter type with '@RawValue' if you want it to be serialized using 'writeValue()'
Marking as @Transient
gives the same error as above:
@Parcelize
data class LeaderboardState(
val progressShown: Boolean = true,
//Same error
@Transient
val pagedList: PagedList<QUser>? = null
) : Parcelable
There is an undocumented annotation I found called @IgnoredOnParcel
which gives the same error, and a lint error on the annotation:
@Parcelize
data class LeaderboardState(
val progressShown: Boolean = true,
//Same error plus lint error on annotation
@IgnoredOnParcel
val pagedList: PagedList<QUser>? = null
) : Parcelable
The lint error in that case is:
@IgnoredOnParcel' is inapplicable to properties declared in the primary constructor
Is there really no way to do this with @Parcelize?
Use a regular class and move the property out of the primary constructor:
@Parcelize
class LeaderboardState(
val progressShown: Boolean = true,
pagedList: PagedList<QUser>? = null
) : Parcelable {
@IgnoredOnParcel
val pagedList: PagedList<QUser>? = pagedList
}
This is apparently the only solution. Make sure to override equals, hashCode, toString, copy, etc as you need them because they won't be defined for a regular class.
EDIT: Here's another solution so you don't lose the features of the data class and you don't lose the automatic parcelization. I'm using a general example here.
data class Person(
val info: PersonInfo
val items: PagedList<Item>? = null)
@Parcelize
data class PersonInfo(
val firstName: String,
val lastName: String,
val age: Int
) : Parcelable
You save only Person.info
and recreate it from that.
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