How to reference a lambda from inside it?

Question

I am trying to get height of a view in onCreate method but I couldn\'t find any way to remove OnGlobalLayoutListener.

In Java (working):

containerLay         


        

Answer 1

Another solution is to implement and use self-reference:

class SelfReference(val initializer: SelfReference.() -> T) {
    val self: T by lazy {
        inner ?: throw IllegalStateException()
    }

    private val inner = initializer()
}

fun  selfReference(initializer: SelfReference.() -> T): T {
    return SelfReference(initializer).self
}

Then the usage would be

containerLayout.viewTreeObserver.addOnGlobalLayoutListener(selfReference { 
    OnGlobalLayoutListener {
        containerLayout.viewTreeObserver.removeOnGlobalLayoutListener(self)
        // ...
    }
}

Instead of this, self property is used.