NavigationView get/find header layout

Question

In my NavigationView I have a header layout with id \'viewId\' with active buttons. To setup those buttons, I do the following in activity\'s onPostCreate:

Answer 1

For me that was the same situation with 23.1.0, after of update the null pointer exception become. In this case the NavigatorView look like:

I tried the solution proposal by ianhanniballake but it does not work. Then I inflated with the sentence:

LayoutInflater.from(getContext()).inflate(R.layout.nav_header, mNavigationView);

After that, I can find by id all views defined in nav_heardlayout .