TextView关键字高亮

//通过正则匹配出关键字，然后使用span使之变色高亮
private SpannableString getHighLightSs(String text, String keyword, int color) {
    SpannableString span = new SpannableString(text);
    Pattern pattern = Pattern.compile(keyword);
    Matcher matcher = pattern.matcher(span);
    while (matcher.find()) {
        span.setSpan(new ForegroundColorSpan(color), matcher.start(), matcher.end(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
    return span;
}

TextView tv = findViewById(R.id.tv);
tv.setText(getHighLightSs(text,keyword,R.color.red));