Kotlin中的泛型和抽象类

Question

我有一个基本的抽象类：

abstract class BaseFragment<T : BasePresenter> : Fragment(){

    protected var presenter : T? = null

    abstract fun providePresenter() : T

    abstract fun getLayoutId() : Int

    abstract fun onCreate()

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val root = inflater?.inflate(getLayoutId(), container, false)
        presenter = providePresenter()
        return root
    }

    override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
        onCreate()
    }

}

我在JAVA中的代码：

//JAVA

private ArrayList<BaseFragment> fragments;

如何使用Kotlin？ 代码下面不起作用

//Kotlin

val tabs = ArrayList<BaseFragment>() //error: One type argument expected for class BaseFragment<T : BasePresenter> : Fragment

Answer 1

您需要为您的T指定类型

val tabs = ArrayList<BaseFragment<SomePresenterType>>()