与Kotlin中的通用类型配对

Question

I want to create a Pair which should take a generic type. I mean, I can pass a String to Int . How can I achieve that?

Example with the current behavior:

val liveData = MutableLiveData<Pair<Boolean, Int>>()

Expectation:

val liveData = MutableLiveData<Pair<T, T>>()

Answer 1

try this

class Abc<T, U> {

    val liveData = MutableLiveData<Pair<T, U>>()

}


fun <T, U> Abc1(): MutableLiveData<Pair<T, U>> {
   return MutableLiveData<Pair<T, U>>()
}
val liveData = Abc<String, Int>()

Answer 2

If you want to pass either String or Int, a sealed class may be the right choice, rather than a generic.

In your case something like:

sealed class StrInt
data class Numeric(val value:Int):StrInt()
data class Alphanum(val value:String):StrInt()

val a:Pair<StrInt, StrInt> = Numeric(10) to Alphanum("qwerty")