Kotlin get type of generic class without instance

Question

I want go get Type of T, but I can not get it from instance. I have to get it from class parameter, how to do it?

abstract class ViewModelFragment<T : ViewModel>{
    protected lateinit var mViewModel: T

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
       mViewModel = ViewModelProviders
                    .of(scope)
                    .get(getGenericTClass())
    // .get(mViewModel.javaClass) // not working either

   }

   inline fun<reified R> getGenericTClass() = R::class.java

}

Right now compiler complains

Cannot use 'T' as refined class type. Use Class instead.

I've tried to use solution from this answer but it's not working for me

Benny · Accepted Answer · 2020-03-10 05:40:46Z

2

I have the same issue and the code below helped me:

val persistentClass = (javaClass.genericSuperclass as ParameterizedType).actualTypeArguments[0] as Class<T>
mViewModel = ViewModelProvider(this, viewModelsFactory).get(persistentClass)

edited Mar 10, 2020 at 5:40

Benny

2,3311 gold badge26 silver badges30 bronze badges

answered Jan 25, 2019 at 10:33

Darthoo

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