change text color of MenuItem

1. get MenuItem out from your Controller, like:

MenuItem item = navigationView.getMenu().getItem(4);
or
MenuItem item = navigationView.getMenu().findItem(R.id.title);

2. use SpannableString replace the origin text

SpannableString s = new SpannableString("My red MenuItem");s.setSpan(new ForegroundColorSpan(Color.RED), 0, s.length(), 0);
item.setTitle(s);