title: How to navigate through menu items using NavigationUI
body: <p>I'm coming from flutter&amp;react native so I've a little hard time to understand how navigation work in android.</p>
  
  <p>I've <code>ShoppingCart fragment</code>, and I added this fragment to navigation graph without arrow.</p>
  
  <p>I also added the cart icon to the app bar as a item menu.</p>
  
  <p>In my MainActivity file I've this method(from google navigation codelab)</p>
  
  <pre><code>override fun onOptionsItemSelected(item: MenuItem): Boolean {
      return item.onNavDestinationSelected(findNavController(R.id.my_nav_host_fragment))
              || super.onOptionsItemSelected(item)
  }
  </code></pre>
  
  <p>How can I navigate to ShoppingCart when I click the cart icon on the app bar?</p>