title: layout-land behaviour
body: <p>I recently started working with Android Studio and I have a question.<br>
  Do you need to create a new activity for landscape mode?<br>
  I made my app in portrait mode with my MainActivity.java and layout/content_main.xml. I created a landscape variation ( land/content_main.xml ) and changed the layout accordingly. I added new buttons and referenced them in the MainActivity file. Everything works fine ( the new buttons can be clicked but do nothing of course ).<br>
      After I write a new setOnClickListener function for the buttons that appear only in the layound-land mode there are no errors but the app wont start. Thanks for the help.<br>
      PS: I checked activity_main.xml and it has both portrait and landscape mode - so that should not be the problem.</p>