private void refreshLayoutByUserNumber() {
    int numUsers = users.length;
    ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
      getSupportActionBar().setDisplayShowTitleEnabled(numUsers > 0);
    }
    contentNoAccounts.setVisibility(numUsers == 0 ? View.VISIBLE : View.GONE);
    contentAccountsPresent.setVisibility(numUsers > 0 ? View.VISIBLE : View.GONE);
    refreshToolbarAndStatusBarStyle();
  }
Display the list of accounts if there are accounts, otherwise display a different layout
explaining the user how this app works and providing the user with an easy way to add an
account.
java/com/google/android/apps/authenticator/AuthenticatorActivity.java