인프런 커뮤니티 질문&답변

하루 꼬박 강의 몇번반복해도...

sendMessage() 메서드 실행시 첫줄의

mChatMemeberRef = mFirebaseDb.getReference("chat_members").child(mChatId);

이게 작동을 안하는것 같습니다. RealTimeBase를 조회해도

• chat_members

• users

  밖에없네요... 뭐가 문제일까요??

  아래에 수업해주신 ChatActivity 소스코드 입니다.

  public class ChatActivity extends AppCompatActivity {

  private String mChatId;

  @BindView(R.id.senderBtn)

  ImageView mSenderButton;

  @BindView(R.id.edtContent)

  EditText mMessageText;

  private FirebaseDatabase mFirebaseDb;

  private FirebaseUser mFirebaseUser;

  private DatabaseReference mChatRef;

  private DatabaseReference mChatMemberRef;

  private DatabaseReference mChatMessageRef;

  private DatabaseReference mUserRef;

  @Override

  protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.content_chat);

  ButterKnife.bind(this);

  mChatId = getIntent().getStringExtra("chat_id");
  mFirebaseDb = FirebaseDatabase.getInstance();
  mFirebaseUser = FirebaseAuth.getInstance().getCurrentUser();
  mUserRef = mFirebaseDb.getReference("users");

  }

  @OnClick(R.id.senderBtn)

  public void onSendEvent(View v) {

  if (mChatId != null) {

  sendMessage();

  Log.d("sendMessgae","센드메시지 실행");

  } else {

  createChat();

  Log.d("createChat","크리트 채팅 실행");

  }

  }

  private void sendMessage() {

  //메세지 키 생성

  mChatMessageRef = mFirebaseDb.getReference("chat_messages").child(mChatId);

  // chat_message > {chat_id} > {message_id} > messageInfo

  String messageId = mChatMessageRef.push().getKey();

  Log.d("chat_messages", messageId);

  String messageText = mMessageText.getText().toString();

  if (messageText.isEmpty()) {
      return;
  }
  final TextMessage textMessage = new TextMessage();
  textMessage.setMessageText(messageText);
  textMessage.setMessageDate(new Date());
  textMessage.setChatId(mChatId);
  textMessage.setMessageId(messageId);
  textMessage.setMessageType(Message.MessageType.TEXT);
  textMessage.setReadUserList(Arrays.asList(new String[]{mFirebaseUser.getUid()}));
  String[] uids = getIntent().getStringArrayExtra("uids");
  if (uids != null) {
      textMessage.setUnreadCount(uids.length - 1);
  }
  mMessageText.setText("");
  mChatMemberRef.addListenerForSingleValueEvent(new ValueEventListener() {
      @Override
      public void onDataChange(final DataSnapshot dataSnapshot) {
          //unreadCount 셋팅하기 위한 대화 상대의 수 가져온다.
          long memberCount = dataSnapshot.getChildrenCount();
          textMessage.setUnreadCount((int) memberCount - 1);
          mChatMemberRef.child(textMessage.getMessageId()).setValue(textMessage, new DatabaseReference.CompletionListener() {
              @Override
              public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
                  Iterator<DataSnapshot> memberIterator = dataSnapshot.getChildren().iterator();
                  while (memberIterator.hasNext()) {
                      User chatMember = memberIterator.next().getValue(User.class);
                      mUserRef.child(chatMember.getUid())
                              .child("chats")
                              .child(mChatId)
                              .child("lastMessage")
                              .setValue(textMessage);
                      if (!chatMember.getUid().equals(mFirebaseUser.getUid())) {
                          mUserRef.child(chatMember.getUid())
                                  .child("chats")
                                  .child(mChatId)
                                  .child("totalUnreadCount")
                                  .addListenerForSingleValueEvent(new ValueEventListener() {
                                      @Override
                                      public void onDataChange(DataSnapshot dataSnapshot) {
                                          long totalUnreadCount = dataSnapshot.getValue(long.class);
                                          dataSnapshot.getRef().setValue(totalUnreadCount+1);
                                      }
                                      @Override
                                      public void onCancelled(DatabaseError databaseError) {
                                      }
                                  });
                      }
                  }
              }
          });
      }
      @Override
      public void onCancelled(DatabaseError databaseError) {
      }
  });

  }

  private boolean isSentMessage = false;

  private void createChat() {

  //<방생성>

  //0. 방 정보 설정 <-- 기존 방이어야 가능함

  //1. 대화 상대가 내가 선택한 사람 추가
  //2. 각 상대별 chats에 방추가
  //3. 에너지 정보 중 읽은 사람에 내 정보 추가
  //4. 첫 메세지 전송
  final Chat chat = new Chat();
  mChatRef = mFirebaseDb.getReference("users").child(mFirebaseUser.getUid()).child("chats");
  mChatId = mChatRef.push().getKey();
  mChatMemberRef = mFirebaseDb.getReference("chat_members").child(mChatId);
  // mChatId = mChatRef.push() --> users >> uid >> chats >> chat_id 가져옴
  chat.setChatId(mChatId);
  chat.setCreateDate(new Date());
  //1:1 채팅
  String uid = getIntent().getStringExtra("uid");
  //1:n 채팅
  String[] uids = getIntent().getStringArrayExtra("uids");
  if (uid != null) {
      //1:1
      uids = new String[]{uid};
  }
  List<String> uidList = new ArrayList<>(Arrays.asList(uids));
  uidList.add(mFirebaseUser.getUid());
  // 방타이틀 == 나를제외한 사용자이름 출력
  final StringBuffer titleBuffer = new StringBuffer();
  for (String userId : uidList) {
      // 유저의 uid >> userInfo
      mUserRef.child(userId).addListenerForSingleValueEvent(new ValueEventListener() {
          @Override
          public void onDataChange(final DataSnapshot dataSnapshot) {
              User member = dataSnapshot.getValue(User.class);
              mChatMemberRef.child(member.getUid())
                      .setValue(member, new DatabaseReference.CompletionListener() {
                          @Override
                          public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
                              // USERS >> chats >> {chat_id} >> chatinfo
                              dataSnapshot.getRef().child("chats").child(mChatId).setValue(chat);
                              if (!isSentMessage) {
                                  Log.d("센드메세지","센드메세지 실행");
                                  sendMessage();
                                  isSentMessage = true;
                              }
                          }
                      });
          }
          @Override
          public void onCancelled(DatabaseError databaseError) {
          }
      });
  }

  }

  }