android || java 截取解析String特殊部分高亮

定义了这样的一坨文字，凡是用标签裱起来，都要
1.解析截取，
2.去标签，
3.包裹内容高亮显示

本周消费<colortag>128.31</colortag>元，余额<colortag>39.92</colortag>元

单纯的我想着自己写，于是****错误的示范****：

private CharSequence getMessage2(String str){
        Map<Integer,Integer> indexMap = new LinkedHashMap<>();
        String regex="<colortag>(.*?)</colortag>";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(str);
        while (m.find()){
            String x = m.group();
            int index = str.indexOf(x);
            String xx = x;
            x = x.replace("<colortag>","");
            x = x.replace("</colortag>","");
            indexMap.put(index,x.length());
            str = str.replace(xx,x);
        }
        return highLightKeyWords(str,indexMap);
    }

    private CharSequence highLightKeyWords(String text, Map<Integer,Integer> indexMap){
        SpannableStringBuilder builder = new SpannableStringBuilder(text);
        for(Map.Entry<Integer, Integer> entry : indexMap.entrySet()){
            int mapKey = entry.getKey();
            int mapValue = entry.getValue();
            builder.setSpan(new ForegroundColorSpan(BaseUtils.getColor(R.color.base_fun_red_nor)), mapKey, mapKey + mapValue, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
        return builder;
    }

后来我写着写着又想起了 Html.from

于是改成下面的样子：

private CharSequence getMessage(String str){
        if (str.contains("<colortag>") && str.contains("</colortag>")){
            str = str.replace("<colortag>","<font color=\"#FF0000\">");
            str = str.replace("</colortag>","</font>");
            return Html.fromHtml(str);
        }
        return str;
    } 

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