Question

在我的自定义对象中，我有7个属性，其中5个是字符串，并且在构造函数中可以自动生成，但其他两个不会自动生成。最后两个是Place和ArrayList<int>类：

class Spot() : Parcelable{
    private var uid: String? = null
    private var timeFrom: String? = null
    private var timeTo: String? = null
    private var rate: String? = null
    private var description: String? = null
    private var place: Place? = null
    private var days : ArrayList<Int>? = null

    constructor(parcel: Parcel) : this() {
        uid = parcel.readString()
        timeFrom = parcel.readString()
        timeTo = parcel.readString()
        rate = parcel.readString()
        description = parcel.readString()
    }
...

我如何将它们包裹？

Answer 1

有几种方法可以做到这一点。您需要在constructor和writeToParcel方法中为ArrayList和Place Object自己添加代码。

构造函数

constructor(parcel: Parcel) : this() {
        uid = parcel.readString()
        timeFrom = parcel.readString()
        timeTo = parcel.readString()
        rate = parcel.readString()
        description = parcel.readString()

        // Add the below to line of code
        days = parcel.readArrayList(Int::class.java.classLoader) as ArrayList<Int>?
        place = parcel.readParcelable<Place>(Place::class.java.classLoader)
    }

writeToParcel

override fun writeToParcel(parcel: Parcel, flags: Int) {
        parcel.writeString(uid)
        parcel.writeString(timeFrom)
        parcel.writeString(timeTo)
        parcel.writeString(rate)
        parcel.writeString(description)

        // Add the below to line of code
        parcel.writeList(days)
        parcel.writeParcelable(place, flags)

    }

如果我没记错的话，Google的Place类已经是Parcelable了，因此此代码应该可以使用。

希望有帮助！

如何包裹Google的Place类？

1 个答案: