How I can use callback in Kotlin?

Question

I have View and one CircleShape , which should show toast in this View. And I use it in main Activity. This is my interface

interface OnClickListenerInterfa         


        

Answer 1

define a function like this:

  fun performWork(param1: String, myCallback: (result: String?) -> Unit) {
    // perform some network work

    // on network finished
    myCallback.invoke("result from network")
  }

use like this:

  performWork("http://..."){ result ->
  //use result
  }