How to know when the RecyclerView has finished laying down the items?

Question

I have a RecyclerView that is inside a CardView. The CardView has a height of 500dp, but I want to shorten this height if the Re

Answer 1

If you are using the android-ktx library and if you need to perform an action after positioning all elements of the Activity, you can use this method:

// define 'afterMeasured' Activity listener:
fun Activity.afterMeasured(f: () -> Unit) {
    window.decorView.findViewById(android.R.id.content).doOnNextLayout {
        f()
    }
}

// in Activity:
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(...)

    afterMeasured {
        // do something here
    }    
}