android studio setLayoutManager和setAdapter报错

Question

看了好多教程还是解决不了Cannot resolve method 'setLayoutManager(androidx.recyclerview.widget.LinearLayoutManager)'、Cannot resolve method 'setAdapter(com.example.xiangqing.adapter.TitleAdapter)'这俩问题

 private void initTitleRecyclerView() {
        LinearLayoutManager manager=new LinearLayoutManager(this, RecyclerView.VERTICAL,false);
        mRecyclerView.setLayoutManager(manager);
        TitleAdapter adapter=new TitleAdapter(mTitleList);
        mRecyclerView.setAdapter(adapter);
    }
```头疼

Answer 1

Cannot resolve method 'setAdapter(com.example.xiangqing.adapter.TitleAdapter)
应该是你的包不全，或者api level不正确，或者配置问题