Type argument is not within its bounds Expected: Parcelable Found: String

问题

I am creating a generic, abstract class like this:

abstract class BaseDialogFragment<T: Parcelable> : DialogFragment()

Trying to implement this class as

class MyDialogFragment : BaseDialogFragment<String>()

gives me

Type argument is not within its bounds Expected: Parcelable Found: String

for the String in BaseDialogFragment<String>().

So, how can I use String as a value for T? Is my condition T: Parcelable somehow wrong, if I want Tto be a parcelable type?

回答1:

So, how can I use String as a value for T?

You can't. String is not Parcelable, because Parcel already knows how to handle String. Similarly, you cannot use ByteArray for T, or Int, or Boolean.

来源：https://stackoverflow.com/questions/61462507/type-argument-is-not-within-its-bounds-expected-parcelable-found-string