我正试图在android应用程序中编写一个可从activityA传递到activityB的可包裹数据对象.
My object is passing with all the data, except my arraylist
of the class Available Service
data class AvailableService(val id: Int,
val name: String,
val description: String,
val price: Double,
val currency: String,
val imageUrl: String) : Parcelable {
companion object {
@JvmField @Suppress("unused")
val CREATOR = createParcel { AvailableService(it) }
}
protected constructor(parcelIn: Parcel) : this(parcelIn.readInt(),
parcelIn.readString(),
parcelIn.readString(),
parcelIn.readDouble(),
parcelIn.readString(),
parcelIn.readString())
override fun writeToParcel(dest: Parcel?, flags: Int) {
dest?.writeInt(id)
dest?.writeString(name)
dest?.writeString(description)
dest?.writeDouble(price)
dest?.writeString(currency)
dest?.writeString(imageUrl)
}
override fun describeContents() = 0
}
above is the available serviceClass
, next I have Trip, which holds an arraylist
of AvailableService
.. I observed this in debug, it is successfully writing the arraylist
, for some reason I have an issue with reading the data.
data class Trip(val id: String,
val status: String,
val orderedServices: ArrayList<OrderedService>) : Parcelable {
companion object {
@JvmField @Suppress("unused")
val CREATOR = createParcel { Trip(it) }
}
protected constructor(parcelIn: Parcel) : this(parcelIn.readString(),
parcelIn.readString(),
arrayListOf<OrderedService>().apply {
parcelIn.readArrayList(OrderedService::class.java.classLoader)
}
)
override fun writeToParcel(dest: Parcel?, flags: Int) {
dest?.writeString(id)
dest?.writeString(status)
dest?.writeList(orderedServices)
}
override fun describeContents() = 0
}
in case someone wonders what's the fun of the CREATOR does, code below:
inline fun <reified T : Parcelable> createParcel(
crossinline createFromParcel: (Parcel) -> T?): Parcelable.Creator<T> =
object : Parcelable.Creator<T> {
override fun createFromParcel(source: Parcel): T? = createFromParcel(source)
override fun newArray(size: Int): Array<out T?> = arrayOfNulls(size)
}
again, writing succeeds, but reading fails, I get an empty arraylist
..
I think that part is the faulty one:
arrayListOf<OrderedService>().apply {
parcelIn.readArrayList(OrderedService::class.java.classLoader)
}
is there a different way to read/write arraylist
? am I writing it wrong? reading it wrong?
提前感谢您的帮助!