尝试从本地服务器加载数据时，模拟器显示空白屏幕

如何解决尝试从本地服务器加载数据时，模拟器显示空白屏幕

我正在尝试使用片段中的 RecyclerView 显示来自本地数据库的一些数据。 我没有错误，但在运行代码时，模拟器仍然没有显示任何内容。

但是，LogCat 将这些消息显示为错误：

1831-1872/? E/SurfaceFlinger：ro.sf.lcd_density 必须定义为构建属性

和

2034-2248/system_process E/TaskPersister：访问最近目录的文件错误（目录不存在？）

请问有什么帮助吗？？

谢谢

我的班级

    private String SectorName;
    private String image_url;

    public sector_services() {};

    public sector_services (String SectorName,String image_url)
    {
        this.SectorName = SectorName;
        this.image_url = image_url;
    }

    public String getName()
    {
        return SectorName;
    }
    public void setName(String name)
    {
        this.SectorName = name;
    }

    public String getImage () { return image_url;}
    public void setImage(String image) {this.image_url = image;}
}

我的适配器

        LayoutInflater inflater;
        List<sector_services> sectors;
        Context c;

    //ViewHolder Class

    public class RecyclerVH extends RecyclerView.ViewHolder
    {
        TextView sectorName;
        ImageView image;

        public RecyclerVH(@NonNull View itemView) {
            super(itemView);
            sectorName= itemView.findViewById(R.id.sector);
            image= itemView.findViewById(R.id.img_sector);
        }
    }


        public ServicesAdapter(Context ctx,List<sector_services> sectors) {
            this.inflater = LayoutInflater.from(ctx);
            this.sectors = sectors;
        }

    @NonNull
    @Override
    public RecyclerVH onCreateViewHolder(@NonNull ViewGroup parent,int viewType) {
        View view = inflater.inflate(R.layout.model_list_services,parent,false);
        return new RecyclerVH(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerVH holder,int position) {

        holder.sectorName.setText(sectors.get(position).getName());
        Picasso.with(c)
                .load(sectors.get(position).getImage()).into(holder.image);

    }

    @Override
    public int getItemCount() {
        return sectors.size();
    }

}

我的片段

    RecyclerView rv;
    List<sector_services> sectors;
    private static String URL = "http://10.0.2.2/rankit_api/test.php";
    Adapter adapter;

    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {

        //Inflate the layout for this fragment,the layout contains the list view
        View view = inflater.inflate(R.layout.fragment_services,container,false);
        
        rv = view.findViewById(R.id.recycler_view_service);
        rv.setHasFixedSize(true);
        sectors = new ArrayList<>();
        LinearLayoutManager llm = new LinearLayoutManager(getActivity());
        llm.setOrientation(LinearLayoutManager.VERTICAL);
        rv.setLayoutManager(llm);
        rv.setAdapter(new ServicesAdapter(getActivity(),sectors));
        //rv.setAdapter((RecyclerView.Adapter) adapter);

        extractSectors();

        return view;
    }

    private void extractSectors() {
        RequestQueue queue = Volley.newRequestQueue(getActivity());

        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.GET,URL,(JSONArray) null,new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {
                for (int i = 0; i < response.length(); i++) {
                    try {
                        JSONObject sectorObject = response.getJSONObject(i);

                        sector_services sector = new sector_services();
                        sector.setName(sectorObject.getString("sector_name"));
                        sector.setImage(sectorObject.getString("sector_image"));
                        sectors.add(sector);

                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }
        },new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.d("tag","onErrorResponse: " + error.getMessage());
            }
        });

        queue.add(jsonArrayRequest);
    }

}