Spannable TextView set color to text

Utils.java

private void setColor(TextView view, String fulltext, String subtext, int color) {
      view.setText(fulltext, TextView.BufferType.SPANNABLE);
      Spannable str = (Spannable) view.getText();
      int i = fulltext.indexOf(subtext);
      str.setSpan(new ForegroundColorSpan(color), i, i + subtext.length(),
          Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}