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

Working modification of @andrino anwser.

As @Juancho pointed in comment above. This method is called several times. In this case we want it to be triggered only once.

Create custom listener with instance e.g

private RecyclerViewReadyCallback recyclerViewReadyCallback;

public interface RecyclerViewReadyCallback {
    void onLayoutReady();
}

Then set OnGlobalLayoutListener on your RecyclerView

recyclerView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                if (recyclerViewReadyCallback != null) {
                    recyclerViewReadyCallback.onLayoutReady();
                }
                recyclerView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            }
        });

after that you only need implement custom listener with your code

recyclerViewReadyCallback = new RecyclerViewReadyCallback() {
             @Override
             public void onLayoutReady() {
                 //
                 //here comes your code that will be executed after all items are laid down
                 //
             }
};