title: How to get the name of layout associated with an activity?
body: <p>In <code>onCreate()</code> method, we can can use <code>setContentView(R.layout.something)</code> to associate a layout to an activity. Is there anyway I could retrieve <code>something</code> later for an activity? </p>
  
  <p>I know I can use <code>this.findViewById(android.R.id.content).getRootView()</code> to get activity's content view but not sure if there anyway from there I can get <code>something</code>?</p>