安卓对ascii码按照由大到小排序

这边直接写成了方法，有用到的直接拿去，请大家多多交流

public static String getParamsSerializeString(Map<String, Object> params) {    StringBuffer buffer = new StringBuffer();    List<String> keyList = new ArrayList<>();    if (params == null || params.isEmpty()) {        return null;    }    Set<String> keySetTry = new TreeSet<>();    keySetTry.addAll(params.keySet());    keyList.addAll(keySetTry);    Collections.reverse(keyList);    for (String key : keyList) {        buffer.append(key + params.get(key));    }    return buffer.toString();}