How to select the first item in a navigation drawer and open a fragment on application start

Question

I have created MainActivity with NavigationView. When Activity is opened I want to automatically select the first item in the navigation d

Answer 1

In onCreate(), following code will load the first item's fragment upon first start:

if (savedInstanceState == null) {
    navigationView.getMenu().performIdentifierAction(R.id.posts, 0);
}

Thanks to calvinfly for this comment.