adapter = new ListLeaderBoardAdapter（this，mLeaderboardlist）;

Question

what shall i do to this one?

This is my list adapter

Answer 1

你不能从片段中调用它。用getActivity（）替换它。

像这样更改您的代码

adapter = new ListLeaderBoardAdapter(getActivity(), mLeaderboardlist);

Answer 2

试试这个

adapter = new ListLeaderBoradAdapter(getActivity(),yourArraylist);