Android change parts of textview color using Spannable

String newText = text + contacts.getPhoneCode() + "\n\n"
            + getText(R.string.currentversion) + CepVizyon.getLicenseText();

Spannable spannable = new SpannableString(newText);

spannable.setSpan(new ForegroundColorSpan(Color.WHITE), text.length(), (text + contacts.getPhoneCode()).length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

myTextView.setText(spannable, TextView.BufferType.SPANNABLE);