почему я не могу получить данные из firebase и отобразить таблицу в моем приложении

Question

Я все еще новичок ie в android студии. Можете ли вы, ребята, помочь мне.

, почему мой код не может отображать данные из Firebase? Я буду признателен за тех, кто хочет помочь мне.

, если вы хотите видеть мои файлы res на android studio, напишите об этом, если хотите.

это мой onCreate Метод.

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //init Firestore

        db = FirebaseFirestore.getInstance();

        //View
        dialog = new SpotsDialog(this);
        title = (MaterialEditText) findViewById(R.id.title);
        description = (MaterialEditText) findViewById(R.id.description);
        fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {

                //ADD new
                if (!isUpdate) {
                    setData(title.getText().toString(), description.getText().toString());
                } else {
                    updateData(title.getText().toString(), description.getText().toString());
                    isUpdate = !isUpdate; //reset flag
                }
            }


        });

        listItem = (RecyclerView) findViewById(R.id.listTodo);
        listItem.setHasFixedSize(true);
        layoutManager = new LinearLayoutManager(this);
        listItem.setLayoutManager(layoutManager);


        loadData(); //load data from firestore
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        if(item.getTitle().equals("DELETE"))
            deleteItem(item.getOrder());
        return super.onContextItemSelected(item);
    }

    private void deleteItem(int index) {
        db.collection("ToDoList")
                .document(toDoList.get(index).getId())
                .delete()
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {
                        loadData();
                    }
                });
    }

    private void updateData(String title, String description) {

        db.collection("ToDoList").document(idUpdate)
                .update("title", title,"Description",description)
                .addOnSuccessListener(new OnSuccessListener<Void>() {
                    @Override
                    public void onSuccess(Void aVoid) {
                        Toast.makeText(MainActivity.this, "Updated!", Toast.LENGTH_SHORT).show();
                        
                    }
                });
                //RealTime Update refresh data
            db.collection("ToDoList").document(idUpdate)
                    .addSnapshotListener(new EventListener<DocumentSnapshot>() {
                        @Override
                        public void onEvent(@Nullable DocumentSnapshot documentSnapshot, @Nullable FirebaseFirestoreException e) {
                            loadData(); //load DAta from firestore

                        }
                    });

    }

    private void setData(String title, String description) {
        //random id
        String id = UUID.randomUUID().toString();
        Map<String,Object> todo = new HashMap<>();
        todo.put("id",id);
        todo.put("title",title);
        todo.put("description",description);

        //database algo
        db.collection("ToDoList").document(id)
                .set(todo).addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void aVoid) {
                //refresh data
                loadData();

            }
        });
    }

    private  void loadData(){
        dialog.show();
        if(toDoList.size() > 0)
            toDoList.clear(); //Remove old value
        db.collection("toDoList")
                .get()
                .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                    @Override
                    public void onComplete(@NonNull Task<QuerySnapshot> task) {
                        for(DocumentSnapshot doc:task.getResult()){
                            ToDo todo = new  ToDo (doc.getString("id"),
                                                    doc.getString("title"),
                                                    doc.getString("description"));
                            toDoList.add(todo);


                        }
                        adapter = new ListItemAdapter(MainActivity.this,toDoList);
                        listItem.setAdapter(adapter);
                        dialog.dismiss();


                    }
                }).addOnFailureListener(new OnFailureListener(){


            @Override
            public void onFailure(@NonNull Exception e) {
                Toast.makeText(MainActivity.this, ""+e.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });

    }

это мой класс ListItemAdapter java.

package com.core.techtaskapp.Adapter;

import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.core.techtaskapp.MainActivity;
import com.core.techtaskapp.Model.ToDo;
import com.core.techtaskapp.R;

import java.util.List;

class ListItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnCreateContextMenuListener{

    ItemClickListener itemClickListener;
    TextView item_title, item_description;


    public ListItemViewHolder(@NonNull View itemView) {
        super(itemView);
        itemView.setOnClickListener(this);
        itemView.setOnCreateContextMenuListener(this);

        item_title =  itemView.findViewById(R.id.item_title);
        item_description = itemView.findViewById(R.id.item_description);

    }

    @Override
    public void onClick(View view) {
        itemClickListener.onClick(view, getAdapterPosition(),false);
    }

    @Override
    public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenu.ContextMenuInfo contextMenuInfo) {
        contextMenu.setHeaderTitle("Select action");
        contextMenu.add(0,0,getAdapterPosition(),"DELETE");

    }
}
public class ListItemAdapter extends RecyclerView.Adapter<ListItemViewHolder>{

    MainActivity mainActivity; //naka base aata ito sa mismong java activity
    List<ToDo> toDoList;


    public ListItemAdapter(MainActivity mainActivity, List<ToDo> toDoList) {
        this.mainActivity = mainActivity;
        this.toDoList = toDoList;
    }

    @NonNull
    @Override
    public ListItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(mainActivity.getBaseContext());
        View view = inflater.inflate(R.layout.list_item,parent,false);
        return new ListItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ListItemViewHolder holder, int position) {
       mainActivity.title.setText(toDoList.get(position).getTitle());
        mainActivity.description.setText(toDoList.get(position).getDescription());

        mainActivity.isUpdate = true; //set flag is update = true
        mainActivity.idUpdate = toDoList.get(position).getId();

        holder.item_title.setText(toDoList.get(position).getId());
        holder.item_description.setText(toDoList.get(position).getDescription());
    }

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

Я всегда получаю эту ошибку, когда отправляю данные в базу данных и извлекаю их из базы.

2020-03-11 19:55:44.040 28822-28822/? E/Zygote: isWhitelistProcess - Process is Whitelisted
2020-03-11 19:55:44.042 28822-28822/? E/Zygote: accessInfo : 1
2020-03-11 19:55:45.251 28822-28822/com.core.techtaskapp E/RecyclerView: No adapter attached; skipping layout
2020-03-11 19:55:47.643 28822-28822/com.core.techtaskapp E/ViewRootImpl: sendUserActionEvent() returned.