title: Dropdown Navigation Android
body: <p>I'm a beginning Android developer and I want to learn how to implement dropdown navigation in my app. Essentially, I would like a different layout to show on the screen when the user selects an item in a spinner in the action bar.</p>
  
  <p>I created a new activity with the Dropdown navigation template in Android Studio but I don't know how to proceed. How would I go about accomplishing this?</p>