随着 Kotlin RC 的发布,我开始编写一个应用程序来学习它,但我无法弄清楚如何让 Parcelable
工作。
数据类:
data class Project (val reponame:String,
val username:String,
val language:String,
val vcsUrl:String,
val branches:Map<String, Branch>) : Parcelable {
companion object {
val CREATOR = object : Parcelable.Creator<Project> {
override fun createFromParcel(`in`: Parcel): Project {
return Project(`in`)
}
override fun newArray(size: Int): Array<Project?> {
return arrayOfNulls(size)
}
}
}
protected constructor(parcelIn: Parcel) : this (
parcelIn.readString(),
parcelIn.readString(),
parcelIn.readString(),
parcelIn.readString(),
mapOf<String, Branch>().apply {
parcelIn.readMap(this, Branch::class.java.classLoader)
}
)
override fun describeContents(): Int {
throw UnsupportedOperationException()
}
override fun writeToParcel(dest: Parcel, flags: Int) {
dest.writeString(reponame)
dest.writeString(username)
dest.writeString(language)
dest.writeString(vcsUrl)
dest.writeMap(branches)
}
}
阅读它:
class ProjectDetailActivity : BaseActivity() {
lateinit var project: Project
companion object {
const val EXTRA_PROJECT = "extra_project"
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
project = intent.extras.getParcelable(EXTRA_PROJECT)
tvTitle.text = project.reponame
}
}
例外情况:
Caused by: android.os.BadParcelableException: Parcelable protocol requires a Parcelable.Creator object called CREATOR on class com.eggman.circleciandroid.model.Project
at android.os.Parcel.readParcelableCreator(Parcel.java:2415)
at android.os.Parcel.readParcelable(Parcel.java:2337)
at android.os.Parcel.readValue(Parcel.java:2243)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2592)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.BaseBundle.get(BaseBundle.java:281)
at com.eggman.circleciandroid.ui.ProjectDetailActivity.onCreate(ProjectDetailActivity.kt:22)
我相信我错过了一些简单的东西,有没有人在最新的Kotlin上使用Parcelable取得了成功?
Kotlin版本:1.0.0-rc-1036
Kotlin插件版本:1.0.0-rc-1036-IJ143-4
Parcelable
不会导致OP中的问题(我甚至无法重现它)。但是异常确实是由于缺少静态字段而抛出的,而答案解决了这个问题。这就是为什么我决定将其还原。你能否复制问题并检查是否解决了它?如果是,我认为这将是更好的答案。 - hotkey