title: Android: Naming menu file
body: <p>I am new to Android SDK (not java) and I had a question or two about options menus. I look around for several tutorials, including the developer.android one. My problem is the naming of files. The menu works fine when in my res/menu folder the menu xml document is titled menu.xml. If I try to call in mainMenu.xml I get a 
       mainMenu cannot be resolved or is not a field
  error.
  Here is the code in my main activity,</p>
  
  <pre><code>@Override
  public boolean onCreateOptionsMenu(Menu menu)
  {
      MenuInflater inflater = getMenuInflater();
      inflater.inflate(R.menu.mainMenu, menu);
      return true;
  }
  </code></pre>
  
  <p>The "mainMenu" in R.menu.mainMenu in the above code is underlined in red (error)
  So my question is can I name my menu file anything I want? This way seems to restrict me to one options menu per project which cannot be correct (unless I am missing something : )</p>