code: public static List<String> convertPinyinList2TonePinyinList(List<Pinyin> pinyinList)
      {
          List<String> tonePinyinList = new ArrayList<String>(pinyinList.size());
          for (Pinyin pinyin : pinyinList)
          {
              tonePinyinList.add(pinyin.getPinyinWithToneMark());
          }
  
          return tonePinyinList;
      }
docs: 转换List<Pinyin> pinyinList到List<String>，其中的String为带声调符号形式
  @param pinyinList
  @return