android studio setLayoutManager和setAdapter报错

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

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

你要用垂直布局写成这样就可以了

LinearLayoutManager manager = new LinearLayoutManager(getContext());

另外，你的TitleAdapter是不是继承的RecyclerView.Adapter

看看记得代码里面是不是敲漏什么了，我搜了好久，在此检查就是写漏了一句view.setTag(holder);