Kotlin-Parcelable遇到的坑，Parcelize使用

我们在页面间跳转时，经常需要传递值，在使用Java中我们实现Parcelable接口，实现响应方法即可。然而我在使用Kotlin的时候，遇到了点问题，问题如下：
问题
1.创建2个Activity，分别是MainActivity和Main2Activity,点击MainActivity上的Button,跳转到Main2Activity，并且传递我们的Bean。
2.创建MainActivity
MainActivity中跳转:
btn.setOnClickListener({
val intent = Intent(this, Main2Activity::class.java)
val user = User(“jzd”, 100)
intent.putExtra(“user”, user)
val bean = DispatchRecordBean(“id”, “plateNumber”, “createTime”, “reason”, “startTime”,
“endTime”, “recipient”, “model”, “carColor”, “carBrands”, “carCategory”, “carYear”, 10)
intent.putExtra(“bean”, bean)
startActivity(intent)
})
User对象：
data class User(val name: String, val age: Int) : Parcelable
{
constructor(parcel: Parcel) : this(
parcel.readString(),
parcel.readInt())
{
}
override fun writeToParcel(parcel: Parcel, flags: Int)
{
parcel.writeString(name)
parcel.writeInt(age)
}
override fun describeContents(): Int
{
return 0
}
companion object CREATOR : Parcelable.Creator<User>
{
override fun createFromParcel(parcel: Parcel): User
{
return User(parcel)
}
override fun newArray(size: Int): Array<User?>
{
return arrayOfNulls(size)
}
}
}
DispatchRecordBean对象：
data class DispatchRecordBean(var id: String, var plateNumber: String, var createTime: String, var reason: String,
var startTime: String, var endTime: String, var recipient: String, var carModel: String, var carColor: String, var carBrands: String, var carCategory: String,
var carYear: String, var dispatchType: Int) : Parcelable
{
constructor(parcel: Parcel) : this(
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readString(),
parcel.readInt())
override fun writeToParcel(parcel: Parcel, flags: Int)
{
parcel.writeString(id)
parcel.writeString(plateNumber)
parcel.writeString(createTime)
parcel.writeString(reason)
parcel.writeString(startTime)
parcel.writeString(endTime)
parcel.writeString(recipient)
parcel.writeString(carModel)
parcel.writeString(carColor)
parcel.writeString(carBrands)
parcel.writeString(carCategory)
parcel.writeString(carYear)
parcel.writeInt(dispatchType)
}
override fun describeContents(): Int
{
return 0
}
companion object CREATOR : Parcelable.Creator<DispatchRecordBean>
{
override fun createFromParcel(parcel: Parcel): DispatchRecordBean
{
return DispatchRecordBean(parcel)
}
override fun newArray(size: Int): Array<DispatchRecordBean?>
{
return arrayOfNulls(size)
}
}
}
3.Main2Activity中接收：
val user = intent.getParcelableExtra<User>(“user”)
mTvName.text = user?.name
mTvAge.text = user?.age.toString()
val bean = intent.getParcelableExtra<DispatchRecordBean>(“bean”)
mTvId.text = bean?.dispatchType.toString()
4.问题就是，我的User对象可以正常传值，而我的Dispatch对象就不能正常传递，Debug看一下代码，发现在Dispatch类的constructor方法中，parcel.readString()取值是跳跃式的取值，正常应该是按照id->plateNumber->createTime->reason->startTime->endTime->recipient->carModel->carColor->carBrands->carCategory->carYear->dispatchType,而Debug发现，parcel.readString()取到的值是id->createTime->startTime->recipient..这样的,到了后面字段值都取不到了，难道是一次取了2个值?在修改Dispatch代码时，发现取值情况还会变化，真的是一头雾水…到现在也不知道是什么情况，最好换成了Parcelize方式传值，解决了问题。
那么接下来说一下Parcelize怎么传递值：
Parcelize传值
在Module的build.gradle中添加：
apply plugin: ‘kotlin-android-extensions’
android
{
androidExtensions {
experimental = true
}
}
修改Dispatch代码，添加Parcelize注解，最后Dispatch代码如下：
@SuppressLint(“ParcelCreator”)
@Parcelize
data class DispatchRecordBean(var id: String, var plateNumber: String, var createTime: String, var reason: String,
var startTime: String, var endTime: String, var recipient: String, var carModel: String, var carColor: String, var carBrands: String, var carCategory: String,
var carYear: String, var dispatchType: Int) : Parcelable
问题迎刃而解，暂时还是使用Parcelize注解传递值吧