code: @TargetApi(Build.VERSION_CODES.HONEYCOMB)
      private void setupActionBar() {
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
              // Show the Up button in the action bar.
              getActionBar().setDisplayHomeAsUpEnabled(true);
          }
      }
docs: Set up the {@link android.app.ActionBar}, if the API is available.