How to get view from drawer header layout with binding in activity?

If you set app:headerLayout="@layout/drawer_header then you don't have to inflate the view again. You can just use .bind instead of .inflate.

You can get the already inflated header view and bind it like this:

View headerView = binding.navigationView.getHeaderView(0);
DrawerHeaderBinding headerBinding = DrawerHeaderBinding.bind(headerView);

Updated solution (13/11/2015)

Solution: Update your Design Support Library to 23.1.1:

Changes for Design Support library 23.1.1:

• Added the getHeaderView method to the NavigationView class.
• Fixed a transparent background issue for a FloatingActionButton object on devices running Android 4.0 (API level 15) and lower. (Issue 183315)

See https://developer.android.com/tools/support-library/index.html for more info

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Original solution

I don't know why there is no method which provides header view attached programmatically.

Instead, here's two solutions:

NavigationView navigationView = (NavigationView) findViewById(R.id.navigation);
View headerView = navigationView.inflateHeaderView(R.layout.header_layout)
ImageView iv = (ImageView)headerview.findViewById(R.id.your_image_view)

Or:

NavigationView navigationView = (NavigationView) findViewById(R.id.navigation);
View headerView = LayoutInflater.from(this).inflate(R.layout.header_layout, navigationView, false);
navigationView.addHeaderView(headerView);

ImageView iv = (ImageView) headerView.findViewById(R.id.yourImageView)