public final void addHelperTextColor(@ColorInt final int color){
  if (!helperTextColors.contains(color)) {
    helperTextColors.add(color);
    verifyPasswordStrength();
  }
}

public final void addHelperTextColor ( @ ColorInt final int color ) { if ( ! helperTextColors . contains ( color ) ) { helperTextColors . add ( color ) ; verifyPasswordStrength ( ) ; } }
adds a new helper text color , which should be used to highlight the helper text , which indicates the password strength .
