java.lang.RuntimeException: Can not toast on a thread that has not called Looper.prepare()终极解决方案
源代码:Threadthread=newThread(()->{MySQLUtilmySQLUtil=newMySQLUtil(this);mySQLUtil.getConnection("cce-18");ArrayListres=null;res=mySQLUtil.getMajorGpaRank(idMyself,major,finalYear,finalSemester_,course_n