logcat的错误：没有适配器连接;跳绳布局

我改变与getActivity（）的上下文参数，但应用程序仍不能运行。

 公共类FragmentActivity扩展片段{
    私人RecyclerView mRecyclerView;
    私人CountryAdapter mAdapter;
    私人LinearLayoutManager的layoutManager;
    公共FragmentActivity（）{}
    @覆盖
    公共查看onCreateView（LayoutInflater充气，容器的ViewGroup，捆绑savedInstanceState）{
        查看rootView = inflater.inflate（R.layout.activity_main，集装箱，假）;
        mRecyclerView =（RecyclerView）rootView.findViewById（R.id.list）;
        的layoutManager =新LinearLayoutManager（getActivity（））;
        mRecyclerView.setLayoutManager（的layoutManager）;
        mRecyclerView.setAdapter（mAdapter）;
        mAdapter =新CountryAdapter（CountryManager.getInstance（）getCountries（），R.layout.card_layout，getActivity（））;
        返回rootView;
    }
    @覆盖
    公共无效onActivityCreated（包savedInstanceState）{
        super.onActivityCreated（savedInstanceState）;
    }
}
 

解决方案

您没有连接适配器，因为在创建后尝试将其附着：

  mRecyclerView.setAdapter（mAdapter）; //这里，mAdapter为空
mAdapter =新CountryAdapter（CountryManager.getInstance（）getCountries（），R.layout.card_layout，getActivity（））;
 

logcat error : No adapter attached; skipping layout

I changed the context argument with getActivity(), but the app is still not running.

public class FragmentActivity extends Fragment {  
    private RecyclerView mRecyclerView;
    private CountryAdapter mAdapter;
    private LinearLayoutManager layoutManager;
    public FragmentActivity(){}
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.activity_main, container, false);
        mRecyclerView = (RecyclerView) rootView.findViewById(R.id.list);
        layoutManager = new LinearLayoutManager(getActivity());
        mRecyclerView.setLayoutManager(layoutManager);
        mRecyclerView.setAdapter(mAdapter);
        mAdapter = new CountryAdapter(CountryManager.getInstance().getCountries(), R.layout.card_layout, getActivity());
        return rootView;
    }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }
}

You didn't attach the adapter because you create it after you try to attach it:

mRecyclerView.setAdapter(mAdapter); // Here, mAdapter is null
mAdapter = new CountryAdapter(CountryManager.getInstance().getCountries(), R.layout.card_layout, getActivity());