Gson中List与String互转

https://blog.csdn.net/ShiXinXin_Harbour/article/details/120829943

String转List:

 mVideoHistoryList = gson.fromJson(strExistList, new TypeToken<List<VideoVpModel>>() {

        }.getType()); //将json字符串转换成List集合

List转String:
String strHistoryList = gson.toJson(mVideoHistorySumList);