android - IllegalStateException:parcel.readString()不能为null

我将Parcelable对象中的Intent对象放入下一个Activity中:

val intent = Intent(mContext, ShowTestActivity::class.java)
intent.putExtra("test", test)
Log.d("myLog", "${intent.getParcelableExtra<Test>("test")}") // No problem
mContext.startActivity(intent)

并在下一个Activity中获得该对象:

if (!intent.hasExtra("test")) throw Exception("Intent doesn't has 'test' extra")
val test: Test = intent.getParcelableExtra("test")

这里抛出异常:

public open class QBase(): Parcelable {
  ...
  protected constructor(parcel: Parcel?) : this() {
      parcel?.let {
          question = parcel.readString() // parcel.readString() must not be null
          helpText = parcel.readString()
          qValue = parcel.readDouble()
          qType = QType.valueOf(parcel.readString())
      }
  }
  override fun writeToParcel(parcel: Parcel, flags: Int) {
      parcel.writeString(question)
      parcel.writeString(helpText)
      parcel.writeDouble(qValue)
      parcel.writeString(qType.name)
 }
  ...
}

并在测试中:

public class Test(): Parcelable {
  ...
  public var questions: ArrayList<QBase> = ArrayList()

  constructor(parcel: Parcel?): this() {
      parcel?.let {
        ...
        parcel.readTypedList(questions, QBase.CREATOR)
      }
  }

  override fun writeToParcel(p: Parcel?, p1: Int) {
      p?.let {
          ...
          it.writeTypedList(questions)
      }
   }
   ...
}

这是一个异常(exception):

最佳答案

question = parcel.readString() // parcel.readString() must not be null
也许您定义的question字段是一个非空字段，如果parcel.readString()的结果返回空值，则会抛出java.lang.IllegalStateException，只需将val question: String的定义更改为val question: String?，然后重试。

关于android - IllegalStateException:parcel.readString()不能为null，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45688232/