Java 带CardView的RecyclerView：未显示任何内容

我正在将

RecyclerView

与

cardwiew

一起使用。我将它们作为片段插入。当我单击并更改时，没有显示任何内容。有人能给我一个建议来修理它吗。我认为向

cardwiew

零件分发数据的零件存在问题

   public class favaoritesFragment extends Fragment {
        public static TextView data;
        private RecyclerView.Adapter mAdapter;
        private RecyclerView.LayoutManager mLayoutManager;
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
            View view = inflater.inflate(R.layout.fragment_favorites,container,false);
            RecyclerView  mRecyclerView = view.findViewById(R.id.recyclerView);
            mRecyclerView.setHasFixedSize(true);
            mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));


            mRecyclerView.setLayoutManager(mLayoutManager);
            mRecyclerView.setAdapter(mAdapter);
            ArrayList<Status> statusArrayList = new ArrayList<>();
            statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));
            statusArrayList.add(new Status(R.drawable.common_google_signin_btn_icon_dark_focused,"Line2","Line3"));
            statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));

            mAdapter = new RecyclerAdapter(statusArrayList);
      　　　return view;
        }

    }

---

解决方案1：先初始化

适配器

，然后再设置为

回收视图

 public class favaoritesFragment extends Fragment {
    public static TextView data;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
        View view = inflater.inflate(R.layout.fragment_favorites,container,false);

        ArrayList<Status> statusArrayList = new ArrayList<>();
        statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));
        statusArrayList.add(new Status(R.drawable.common_google_signin_btn_icon_dark_focused,"Line2","Line3"));
        statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));

        mAdapter = new RecyclerAdapter(statusArrayList);

        RecyclerView  mRecyclerView = view.findViewById(R.id.recyclerView);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        mRecyclerView.setAdapter(mAdapter);
  　　　return view;
    }

}

---

您应该在

初始化
您的
适配器之后，将
适配器设置为
回收视图
。您将
layout manager
设置为
recyclerview
两次。所以你应该去掉一个

public class favaoritesFragment extends Fragment {
        public static TextView data;
        private RecyclerView.Adapter mAdapter;
        private RecyclerView.LayoutManager mLayoutManager;
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
            View view = inflater.inflate(R.layout.fragment_favorites,container,false);
            RecyclerView  mRecyclerView = view.findViewById(R.id.recyclerView);
            mRecyclerView.setHasFixedSize(true);

            mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

            // remove below line cause in above line you set layoutManager.
            //mRecyclerView.setLayoutManager(mLayoutManager);

            ArrayList<Status> statusArrayList = new ArrayList<>();
            statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));
            statusArrayList.add(new Status(R.drawable.common_google_signin_btn_icon_dark_focused,"Line2","Line3"));
            statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));

            mAdapter = new RecyclerAdapter(statusArrayList);
            // here you should set adapter to your recycler view after initialize the adapter.
            mRecyclerView.setAdapter(mAdapter); 
      　　　return view;
        }

    }

公共类favaoritesFragment扩展片段{
公共静态文本视图数据；
专用回收器查看适配器mAdapter；
private RecyclerView.LayoutManager MLLayoutManager；
@凌驾
CreateView上的公共视图（布局、充气机、视图组容器、捆绑包保存状态）{
视图=充气机。充气（R.layout.fragment\u收藏夹，容器，false）；
RecyclerView mRecyclerView=view.findViewById（R.id.RecyclerView）；
mRecyclerView.setHasFixedSize（true）；
setLayoutManager（新的LinearLayoutManager（getActivity（））；
//删除您在layoutManager设置的行上方的行下方原因。
//mRecyclerView.setLayoutManager（mllayoutmanager）；
ArrayList Status ArrayList=新建ArrayList（）；
statusArrayList.add（新状态（R.drawable.ic_action_name，“Line2”、“Line3”）；
statusArrayList.add（新状态（R.drawable.common\u google\u signin\u btn\u icon\u dark\u focused，“Line2”、“Line3”）；
statusArrayList.add（新状态（R.drawable.ic_action_name，“Line2”、“Line3”）；
mAdapter=新的回收适配器（statusArrayList）；
//在这里，您应该在初始化适配器后将适配器设置为回收器视图。
mRecyclerView.setAdapter（mAdapter）；
　　　返回视图；
}
}

public class favaoritesFragment extends Fragment {
    public static TextView data;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
        View view = inflater.inflate(R.layout.fragment_favorites,container,false);
        RecyclerView  mRecyclerView = view.findViewById(R.id.recyclerView);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        mRecyclerView.setAdapter(mAdapter);
        ArrayList<Status> statusArrayList = new ArrayList<>();
        statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));
        statusArrayList.add(new Status(R.drawable.common_google_signin_btn_icon_dark_focused,"Line2","Line3"));
        statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));

        mAdapter = new RecyclerAdapter(statusArrayList);
        mAdapter.notifyDataSetChanged();
  　　　return view;
    }

}

public class favaoritesFragment extends Fragment {
        public static TextView data;
        private RecyclerView.Adapter mAdapter;
        private RecyclerView.LayoutManager mLayoutManager;
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){
            View view = inflater.inflate(R.layout.fragment_favorites,container,false);
            RecyclerView  mRecyclerView = view.findViewById(R.id.recyclerView);
            mRecyclerView.setHasFixedSize(true);

            mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

            // remove below line cause in above line you set layoutManager.
            //mRecyclerView.setLayoutManager(mLayoutManager);

            ArrayList<Status> statusArrayList = new ArrayList<>();
            statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));
            statusArrayList.add(new Status(R.drawable.common_google_signin_btn_icon_dark_focused,"Line2","Line3"));
            statusArrayList.add(new Status(R.drawable.ic_action_name,"Line2","Line3"));

            mAdapter = new RecyclerAdapter(statusArrayList);
            // here you should set adapter to your recycler view after initialize the adapter.
            mRecyclerView.setAdapter(mAdapter); 
      　　　return view;
        }

    }