@Override
  public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == R.id.how_it_works) {
      startActivity(new Intent(this, HowItWorksActivity.class));
      return true;
    } else if (item.getItemId() == R.id.settings) {
      startActivity(new Intent(this, SettingsActivity.class));
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
2-step verification enrollment wizard page for adding an account scanning a QR code or manually
entering its details (name and secret key).
java/com/google/android/apps/authenticator/enroll2sv/wizard/AddAccountActivity.java