Kotlin外围

Question

我想在Kotlin中创建一个"匿名内部类"时访问调用类的范围.什么相当于Java的OuterScope.this语法？例如:

open class SomeClass {
    open fun doSomething() {
        // ...
    }
}

class MyClass {
    fun someFunc() {
        object : SomeClass() {
            override fun doSomething() {
                super<SomeClass>.doSomething()
                // Access the outer class context, in Java
                // this would be MyClass.this
            }
        }
    }
}

Answer 1

this@MyClass

JFYI:访问扩展功能接收器的语法相同:

fun MyClass.foo() {
    // in some nested thing:
    this@foo
    //...
}

Kotlin参考:这个表达式

Answer 2

就我而言，我像这样访问它： this@MainActivity

class MainActivity : AppCompatActivity() {
   inner class Anon : Observer<PagedList<ApplicationUsers>> {
        override fun onChanged(pagedList: PagedList<ApplicationUsers>?) {
            Toast.makeText(this@MainActivity, "hello", Toast.LENGTH_SHORT).show()
        }
    }
}