Team Chat & Messaging

public class BaseMessage {
    String message;      // Message content
    String senderName;   // Sender's user ID
    String msgRole;      // "Manager" or "Salesperson"
    String createdAt;    // Unix timestamp
    
    public BaseMessage(String message, String createdAt, String senderName, String msgRole) {
        this.message = message;
        this.senderName = senderName;
        this.createdAt = createdAt;
        this.msgRole = msgRole;
    }
}

private RecyclerView recyclerView;           // Message list
private MessageListAdapter messageListAdapter; // Adapter for messages
private Button sendButton;                   // Send message button
private EditText chatBox;                    // Message input field
private String SalespersonName;              // Your name
private String ManagerName;                  // Manager's name

ChatsTable/
  ├─ {ManagerName}-{SalespersonName}/
  │   ├─ {messageId1}/
  │   │   ├─ message: "Hello, I have a question about inventory"
  │   │   ├─ senderName: "userId123"
  │   │   ├─ msgRole: "Salesperson"
  │   │   └─ createdAt: "1709501234"
  │   ├─ {messageId2}/
  │   │   ├─ message: "Sure, what do you need to know?"
  │   │   ├─ senderName: "userId456"
  │   │   ├─ msgRole: "Manager"
  │   │   └─ createdAt: "1709501298"

tmp1 = ManagerName.replaceAll("\\s+","");  // Remove spaces from manager name
tmp2 = SalespersonName.replaceAll("\\s+","");  // Remove spaces from salesperson name
String chatRoomKey = tmp1 + "-" + tmp2;

databaseReference.child(tmp1+"-"+tmp2).addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
        databaseReference.child(tmp1+"-"+tmp2)
            .addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                    final ArrayList<BaseMessage> mMessages = new ArrayList<>();
                    
                    for(DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()){
                        BaseMessage bm = dataSnapshot1.getValue(BaseMessage.class);
                        mMessages.add(bm);
                    }
                    
                    messageListAdapter = new MessageListAdapter(getApplicationContext(), mMessages);
                    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
                    recyclerView.setLayoutManager(linearLayoutManager);
                    recyclerView.setAdapter(messageListAdapter);
                    messageListAdapter.notifyDataSetChanged();
                    recyclerView.smoothScrollToPosition(mMessages.size()-1);  // Scroll to bottom
                }
            });
    }
    // ... other listener methods
});

else if(id == R.id.chat_room){
    Intent intent = new Intent(ManagerMain.this, ChatRoom.class);
    intent.putExtra("ManagerNumber", salesManager.getNumber());
    intent.putExtra("Name", salesManager.getName());
    startActivity(intent);
}

else if(id1 == R.id.chat_room){
    // Get manager details
    DatabaseReference databaseReference1 = FirebaseDatabase.getInstance()
        .getReference("Manager");
    databaseReference1.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren()){
                SalesManager salesManager = dataSnapshot1.getValue(SalesManager.class);
                if(salesManager.getName().equals(thisManagerName)){
                    Intent intent = new Intent(SalespersonMain.this, ChatRoom.class);
                    intent.putExtra("ManagerNumber", salesManager.getNumber());
                    intent.putExtra("Name", SalesPersonName);
                    startActivity(intent);
                }
            }
        }
    });
}

public class ChatRoom extends AppCompatActivity {
    private RecyclerView recyclerView;
    private ChatRoomAdapter chatRoomAdapter;
    // Implementation details
}

public class MessageListAdapter extends RecyclerView.Adapter {
    private static final int VIEW_TYPE_MESSAGE_SENT = 1;
    private static final int VIEW_TYPE_MESSAGE_RECEIVED = 2;
    
    @Override
    public int getItemViewType(int position) {
        BaseMessage message = mMessageList.get(position);
        
        // Determine if message was sent by current user
        if (message.getSenderName().equals(currentUserId)) {
            return VIEW_TYPE_MESSAGE_SENT;
        } else {
            return VIEW_TYPE_MESSAGE_RECEIVED;
        }
    }
    
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == VIEW_TYPE_MESSAGE_SENT) {
            // Inflate sent message layout
        } else {
            // Inflate received message layout
        }
    }
}

public class MessageHolder extends RecyclerView.ViewHolder {
    // Sent message view holder
}

public class ReceivedMessageHolder extends RecyclerView.ViewHolder {
    // Received message view holder  
}

Long tsLong = System.currentTimeMillis()/1000 - 19800;
String ts = tsLong.toString();