How to instantiate an anonymous class that implements an interface in Kotlin

In Java, instantiate an interface object is as easy as `new Interface()`... and override all the required functions as below, on `AnimationListener`

private void doingSomething(Context context) {
Animation animation = AnimationUtils.loadAnimation(context, android.R.anim.fade_in);
animation.setAnimationListener(new Animation.AnimationListener() {
// All the other override functions
});
}

However, in Kotlin when we type

private fun doingSomething(context: Context) {
val animation = AnimationUtils.loadAnimation(context, android.R.anim.fade_in)
animation.setAnimationListener(Animation.AnimationListener(){
// All the other override functions
})
}

It error complaints unresolved References AnimationListener.

Apparently the latest way (using Kotlin 1.0.5) of doing it is now without the parenthesis, given there's no empty constructor for the interface.

animation.setAnimationListener(object : Animation.AnimationListener {
// All the other override functions
})

As explained in [the documentation][1]:

animation.setAnimationListener(object : Animation.AnimationListener {
// All the other override functions
})


[1]:

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