为什么不发送消息？

Question

我有点困惑，需要一些帮助来解决这个小问题。我已经创建了聊天活动，但是我不确定为什么在键入消息并单击“发送”时，消息没有存储在数据库中。我已经提到了代码。请尽量不要与聊天室的名称混淆，我之所以这样命名，是因为我不想创建聊天室。我只想直接从数据库中选择一个用户并向他们发送消息。让我知道是否需要对代码进行任何其他更改才能实现此目的。

Chat.java

package com.example.firestoretest;

public class Chat {

    private String id;
    private String senderId;
    private String message;
    private long sent;

    public Chat(String id, String chatRoomId, String senderId, String message, long sent) {
        this.id = id;
        this.senderId = senderId;
        this.message = message;
        this.sent = sent;
    }


    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getSenderId() {
        return senderId;
    }

    public void setSenderId(String senderId) {
        this.senderId = senderId;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public long getSent() {
        return sent;
    }

    public void setSent(long sent) {
        this.sent = sent;
    }
}

ChatRoom.java

package com.example.firestoretest;

public class ChatRoom {

    private String id;
    private String name;

    public ChatRoom(String id, String name) {
        this.id = id;
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

ChatRoomActivity.java

package com.example.firestoretest;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.preference.PreferenceManager;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.FirebaseFirestore;

public class ChatRoomActivity extends AppCompatActivity {
    public static final String CHAT_ROOM_ID = "CHAT_ROOM_ID";
    public static final String CHAT_ROOM_NAME = "CHAT_ROOM_NAME";
    private static final String CURRENT_USER_KEY = "CURRENT_USER_KEY";
    private String userId = "";
    private String userName = "";
    private ChatRoomRepository chatRoomRepository;
    private EditText message;
    private ImageButton send;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat_room);
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            userId = extras.getString(CHAT_ROOM_ID, "");
            userName = extras.getString(CHAT_ROOM_NAME, "");
            chatRoomRepository = new ChatRoomRepository(FirebaseFirestore.getInstance());
            userId = getCurrentUserKey();
            initUI();
        }


        if (getSupportActionBar() != null) {
            setTitle(userName);
        }
    }
    private String getCurrentUserKey() {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        return preferences.getString(CURRENT_USER_KEY, "");
    }

    private void initUI() {
        message = findViewById(R.id.message_text);
        send = findViewById(R.id.send_message);

        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (message.getText().toString().isEmpty()) {
                    Toast.makeText(
                            ChatRoomActivity.this,
                            getString(R.string.error_empty_message),
                            Toast.LENGTH_SHORT
                    ).show();
                } else {
                    addMessageToChatRoom();
                }
            }
        });
    }

    private void addMessageToChatRoom() {
        String chatMessage = message.getText().toString();
        message.setText("");
        send.setEnabled(false);
        chatRoomRepository.addMessageToChatRoom(
                userId,
                chatMessage,
                new OnSuccessListener<DocumentReference>() {
                    @Override
                    public void onSuccess(DocumentReference documentReference) {
                        send.setEnabled(true);
                    }
                },
                new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        send.setEnabled(true);
                        Toast.makeText(
                                ChatRoomActivity.this,
                                getString(R.string.error_message_failed),
                                Toast.LENGTH_SHORT
                        ).show();
                    }
                }
        );
    }
}

ChatRoomRepository.java

package com.example.firestoretest;

import androidx.annotation.NonNull;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.EventListener;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QuerySnapshot;

import java.util.HashMap;
import java.util.Map;

public class ChatRoomRepository {
    private static final String TAG = "ChatRoomRepo";

    private FirebaseFirestore db;

    public ChatRoomRepository(FirebaseFirestore db) {
        this.db = db;
    }

    public void createRoom(String name,
                           final OnSuccessListener<DocumentReference> successCallback,
                           final OnFailureListener failureCallback) {
        Map<String, Object> room = new HashMap<>();
        room.put("name", name);

        db.collection("rooms")
                .add(room)
                .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                    @Override
                    public void onSuccess(DocumentReference documentReference) {
                        successCallback.onSuccess(documentReference);
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        failureCallback.onFailure(e);
                    }
                });
    }
    public void getRooms(EventListener<QuerySnapshot> listener) {
        db.collection("users")
                .orderBy("name")
                .addSnapshotListener(listener);
    }
    public void addMessageToChatRoom(String senderId,
                                     String message,
                                     final OnSuccessListener<DocumentReference> successCallback,
                                     final OnFailureListener failureCallback) {
        Map<String, Object> chat = new HashMap<>();
        chat.put("sender_id", senderId);
        chat.put("message", message);
        chat.put("sent", System.currentTimeMillis());

        db.collection("chats")
                .add(chat)
                .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
                    @Override
                    public void onSuccess(DocumentReference documentReference) {
                        successCallback.onSuccess(documentReference);
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        failureCallback.onFailure(e);
                    }
                });
    }
}

ChatsRoomAdapter.java

    package com.example.firestoretest;

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

    import androidx.recyclerview.widget.RecyclerView;

    import java.util.List;

    public class ChatRoomsAdapter extends RecyclerView.Adapter<ChatRoomsAdapter.ChatRoomViewHolder> {

        private List<ChatRoom> chatRooms;

        public ChatRoomsAdapter(List<ChatRoom> chatRooms) {
            this.chatRooms = chatRooms;
        }

        @Override
        public ChatRoomViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(parent.getContext()).inflate(
                    R.layout.item_chat_room,
                    parent,
                    false
            );
            return new ChatRoomViewHolder(view);
        }

        @Override
        public void onBindViewHolder(ChatRoomViewHolder holder, int position) {
            holder.bind(chatRooms.get(position));
        }

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

        class ChatRoomViewHolder extends RecyclerView.ViewHolder {
            TextView name;
            ChatRoom chatRoom;

            public ChatRoomViewHolder(View itemView) {
                super(itemView);
                name = itemView.findViewById(R.id.item_chat_room_name);
itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(v.getContext(),ChatRoomActivity.class);
                    v.getContext().startActivity(intent);
                }
            });
            }

            public void bind(ChatRoom chatRoom) {
                this.chatRoom = chatRoom;
                name.setText(chatRoom.getName());
            }
        }
    }

ChatsAdapter.java

package com.example.firestoretest;

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

import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

public class ChatsAdapter extends RecyclerView.Adapter<ChatsAdapter.ChatViewHolder> {
    private static final int SENT = 0;
    private static final int RECEIVED = 1;

    private String userId;
    private List<Chat> chats;

    public ChatsAdapter(List<Chat> chats, String userId) {
        this.chats = chats;
        this.userId = userId;
    }

    @Override
    public ChatViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view;
        if (viewType == SENT) {
            view = LayoutInflater.from(parent.getContext()).inflate(
                    R.layout.item_chat_sent,
                    parent,
                    false
            );
        } else {
            view = LayoutInflater.from(parent.getContext()).inflate(
                    R.layout.item_chat_received,
                    parent,
                    false);
        }
        return new ChatViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ChatViewHolder holder, int position) {
        holder.bind(chats.get(position));
    }

    @Override
    public int getItemViewType(int position) {
        if (chats.get(position).getSenderId().contentEquals(userId)) {
            return SENT;
        } else {
            return RECEIVED;
        }
    }

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

    class ChatViewHolder extends RecyclerView.ViewHolder {
        TextView message;

        public ChatViewHolder(View itemView) {
            super(itemView);
            message = itemView.findViewById(R.id.chat_message);
        }

        public void bind(Chat chat) {
            message.setText(chat.getMessage());
        }
    }
}

MainActivity.java

package com.example.firestoretest;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import androidx.preference.PreferenceManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.EventListener;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.FirebaseFirestoreException;
import com.google.firebase.firestore.QueryDocumentSnapshot;
import com.google.firebase.firestore.QuerySnapshot;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    private static final String CURRENT_USER_KEY = "CURRENT_USER_KEY";
    AuthenticationRepository authentication;
    ChatRoomRepository chatRoomRepository;
    private RecyclerView chatRooms;
    private ChatRoomsAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        authentication = new AuthenticationRepository(FirebaseFirestore.getInstance());
        chatRoomRepository = new ChatRoomRepository(FirebaseFirestore.getInstance());
        authenticate();
        initUI();
        getChatRooms();
    }
    private void getChatRooms() {
        chatRoomRepository.getRooms(new EventListener<QuerySnapshot>() {
            @Override
            public void onEvent(QuerySnapshot snapshots, FirebaseFirestoreException e) {
                if (e != null) {
                    Log.e("MainActivity", "Listen failed.", e);
                    return;
                }

                List<ChatRoom> rooms = new ArrayList<>();
                for (QueryDocumentSnapshot doc : snapshots) {
                    rooms.add(new ChatRoom(doc.getId(), doc.getString("name")));
                }

                adapter = new ChatRoomsAdapter(rooms);
                chatRooms.setAdapter(adapter);
            }
        });
    }
    private void initUI() {
        chatRooms = findViewById(R.id.rooms);
        chatRooms.setLayoutManager(new LinearLayoutManager(this));
    }
    private void authenticate() {
        String currentUserKey = getCurrentUserKey();
        if (currentUserKey.isEmpty()) {
            authentication.createNewUser(
                    new OnSuccessListener<DocumentReference>() {
                        @Override
                        public void onSuccess(DocumentReference documentReference) {
                            saveCurrentUserKey(documentReference.getId());
                            Toast.makeText(MainActivity.this, "New user created", Toast.LENGTH_SHORT).show();
                        }
                    },
                    new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Toast.makeText(
                                    MainActivity.this,
                                    "Error creating user. Check your internet connection",
                                    Toast.LENGTH_SHORT)
                                    .show();
                        }
                    }
            );
        } else {
            authentication.login(
                    currentUserKey,
                    new OnSuccessListener<DocumentReference>() {
                        @Override
                        public void onSuccess(DocumentReference documentReference) {
                            Toast.makeText(MainActivity.this, "Logged in", Toast.LENGTH_SHORT).show();
                        }
                    },
                    new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Toast.makeText(
                                    MainActivity.this,
                                    "Error signing in. Check your internet connection",
                                    Toast.LENGTH_SHORT)
                                    .show();
                        }
                    }
            );
        }
    }
    private String getCurrentUserKey() {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        return preferences.getString(CURRENT_USER_KEY, "");
    }

    private void saveCurrentUserKey(String key) {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putString(CURRENT_USER_KEY, key);
        editor.apply();
    }

}