关于Kotlin反射中的实例化类问题

时间:2018-09-26 07:48:34

标签: java kotlin kotlin-reified-type-parameters

这是Java代码:

public class TUtil {
    public static <T> T getT(Object o, int i) {
        try {
            return ((Class<T>) ((ParameterizedType) (o.getClass()
                    .getGenericSuperclass())).getActualTypeArguments()[i])
                    .newInstance();
        } catch (InstantiationException e) {
        } catch (IllegalAccessException e) {
        } catch (ClassCastException e) {
        }
        return null;
    }
}

//use code:
public abstract class BaseMVPActivity<T extends BasePresenter, E extends BaseModel>{
    ···Omit code····
    mPresenter = TUtil.getT(this, 0);
    mModel = TUtil.getT(this, 1);
    ···Omit code····
}

我尝试用Kotlin编写以下uitl类:

class KClassUtil {
    companion object {
        inline fun <reified T> getKType(K: Any,position:Int):T {
            var parameterizedType = K::class.java.genericSuperclass as ParameterizedType
            var actualTypeArguments = parameterizedType.actualTypeArguments
            return ( actualTypeArguments[position].javaClass as Class<T>).newInstance()
        }
    }
}

//use code:
abstract class BaseMVPActivity<T : BasePresenter<*, *>, E : BaseModel> : BaseActivity(){
    ···Omit code····
    mPresenter = KClassUtil.getKType(this, 0)   //error here
    mModel = KClassUtil.getKType(this, 1)       //error here
    ···Omit code····
}

错误提示是: 不能使用'T'作为化类型参数。请改用课程。

在这里,kotlin必须将我写给特定的类,但是由于这是一个抽象类,所以我不知道特定的类是什么。我该如何解决这个问题?

0 个答案:

没有答案