code: static boolean canCheckForV7Toolbar() {
          if (sToolbarCheck == null) {
              try {
                  Class.forName("android.support.v7.widget.Toolbar");
                  sToolbarCheck = Boolean.TRUE;
              } catch (ClassNotFoundException e) {
                  sToolbarCheck = Boolean.FALSE;
              }
          }
          return sToolbarCheck;
      }
docs: See if the user has added appcompat-v7, this is done at runtime, so we only check once.
  
  @return true if the v7.Toolbar is on the classpath