当我点击不同的人聊天室应用程序打开同一个人聊天
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【中文标题】当我点击不同的人聊天室应用程序打开同一个人聊天【英文标题】：When I click on different person Chat room the app opening the same person chat 【发布时间】：2021-09-10 01:35:16 【问题描述】：我遇到了问题，请检查查找问题：当我点击不同的聊天室时，它会打开同一个聊天室，如下所示：
这是 Chatsfragment.java（左侧屏幕）
public class ChatsFragment extends Fragment
private RecyclerView recyclerView;
private FriendsAdapter userAdapter;
private List<Users> mUsers;
FirebaseUser fuser;
DatabaseReference reference;
private List<String> usersList;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view = inflater.inflate(R.layout.fragment_chats, container, false);
recyclerView = view.findViewById(R.id.ChatsFragment_recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
usersList = new ArrayList<>();
fuser = FirebaseAuth.getInstance().getCurrentUser();
reference = FirebaseDatabase.getInstance().getReference("Chats");
reference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
usersList.clear();
for(DataSnapshot snapshot:dataSnapshot.getChildren())
Chat chat=snapshot.getValue(Chat.class);
assert chat != null;
if (chat.getSender().equals(fuser.getUid()))
usersList.add(chat.getReceiver());
if (chat.getReceiver().equals(fuser.getUid()))
usersList.add(chat.getSender());
Set<String> hashSet = new HashSet<String>(usersList);
usersList.clear();
usersList.addAll(hashSet);
readChats();
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
UpdateToken();
return view;
private void UpdateToken()
FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
String refreshToken = FirebaseInstanceId.getInstance().getToken();
Token token = new Token(refreshToken);
FirebaseDatabase.getInstance().getReference("Tokens").child(FirebaseAuth.getInstance().getCurrentUser().getUid()).setValue(token);
private void readChats()
mUsers=new ArrayList<>();
reference= FirebaseDatabase.getInstance().getReference("Users");
reference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
//mUsers.clear();
for(DataSnapshot snapshot:dataSnapshot.getChildren())
Users user=snapshot.getValue(Users.class);
for(String id:usersList)
assert user != null;
if (user.getUser_id().equals(id))
mUsers.add(user);
userAdapter=new FriendsAdapter(getContext(),mUsers,true);
recyclerView.setAdapter(userAdapter);
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
这是 MessageActivity.java（右侧屏幕）
public class MessageActivity extends AppCompatActivity
CircleImageView profile_image;
TextView username,fullname;
FirebaseUser fuser;
DatabaseReference reference;
private Toolbar toolbar;
Intent intent;
boolean notify = false;
TextView btn_send;
EditText text_send;
MessageAdapter messageAdapter;
List<Chat> mchat;
RecyclerView recyclerView;
String userid;
private APIService apiService;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
toolbar = findViewById(R.id.MessageActivity_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle("");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
username = (TextView)findViewById(R.id.MessageActivity_userName);
fullname = (TextView)findViewById(R.id.MessageActivity_fullname);
profile_image = (CircleImageView)findViewById(R.id.MessageActivity_user_img);
btn_send =findViewById(R.id.MessageActivity_btn_send);
text_send = findViewById(R.id.MessageActivity_text_send);
apiService = Client.getClient("https://fcm.googleapis.com/").create(APIService.class);
recyclerView = findViewById(R.id.MessageActivity_recyclerView);
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
linearLayoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(linearLayoutManager);
intent = getIntent();
userid = intent.getStringExtra("userid");
fuser = FirebaseAuth.getInstance().getCurrentUser();
reference = FirebaseDatabase.getInstance().getReference("Users").child(userid);
reference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
Users user = dataSnapshot.getValue(Users.class);
username.setText(user.getUsername());
fullname.setText(user.getFullName());
Glide.with(MessageActivity.this)
.load(user.getProfilePhoto())
.into(profile_image);
readMesagges(fuser.getUid(), userid, user.getProfilePhoto());
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
btn_send.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
notify = true;
String msg = text_send.getText().toString();
if (!msg.equals(""))
sendMessage(fuser.getUid(), userid, msg);
else
Toast.makeText(MessageActivity.this, "You can't send empty message", Toast.LENGTH_SHORT).show();
text_send.setText("");
closeKeyboard();
);
private void sendMessage(String sender, final String receiver, String message)
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
HashMap<String, Object> hashMap = new HashMap<>();
hashMap.put("sender", sender);
hashMap.put("receiver", receiver);
hashMap.put("message", message);
hashMap.put("isseen", false);
reference.child("Chats").push().setValue(hashMap);
final String msg = message;
reference = FirebaseDatabase.getInstance().getReference("Users").child(fuser.getUid());
reference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
Users user = dataSnapshot.getValue(Users.class);
if (notify)
sendNotifiaction(receiver, user.getUsername(), msg);
notify = false;
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
private void sendNotifiaction(String receiver, final String username, final String message)
DatabaseReference tokens = FirebaseDatabase.getInstance().getReference("Tokens");
Query query = tokens.orderByKey().equalTo(receiver);
query.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
for (DataSnapshot snapshot : dataSnapshot.getChildren())
Token token = snapshot.getValue(Token.class);
Data data = new Data(fuser.getUid(), R.mipmap.ic_launcher, username+":"+message, "New Message",
userid);
NotificationSender sender = new NotificationSender(data, token.getToken());
apiService.sendNotification(sender).enqueue(new Callback<MyResponse>()
@Override
public void onResponse(Call<MyResponse> call, Response<MyResponse> response)
if (response.code() == 200)
if (response.body().success != 1)
Toast.makeText(MessageActivity.this, "Failed", Toast.LENGTH_SHORT).show();
@Override
public void onFailure(Call<MyResponse> call, Throwable t)
);
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
private void readMesagges(final String myid, final String userid, final String imageurl)
mchat = new ArrayList<>();
reference = FirebaseDatabase.getInstance().getReference("Chats");
reference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
mchat.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren())
Chat chat = snapshot.getValue(Chat.class);
if (chat.getReceiver().equals(myid) && chat.getSender().equals(userid) ||
chat.getReceiver().equals(userid) && chat.getSender().equals(myid))
mchat.add(chat);
messageAdapter = new MessageAdapter(MessageActivity.this, mchat, imageurl);
recyclerView.setAdapter(messageAdapter);
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
private void closeKeyboard()
View view = this.getCurrentFocus();
if(view != null)
InputMethodManager imm = (InputMethodManager) this.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
这里是 FriendsAdapter.java
public FriendsAdapter(Context mcontext, List<Users> muser, boolean ischat)
this.mcontext = mcontext;
this.muser = muser;
this.ischat = ischat;
@NonNull
@Override
public FriendsAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType)
View view = LayoutInflater.from(mcontext).inflate(R.layout.friends_single_layout,parent,false);
return new FriendsAdapter.ViewHolder(view);
@Override
public void onBindViewHolder(@NonNull FriendsAdapter.ViewHolder holder, int position)
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
users = muser.get(position);
holder.username.setText(users.getFullName());
// holder.fullname.setText(users.getFullName());
Glide.with(mcontext)
.load(users.getProfilePhoto())
.into(holder.profileimage);
if (ischat)
lastMessage(users.getUser_id(), holder.last_msg);
else
holder.last_msg.setText(users.getFullName());
holder.itemView.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
Intent intent = new Intent(mcontext, MessageActivity.class);
intent.putExtra("userid",users.getUser_id());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mcontext.startActivity(intent);
);
@Override
public int getItemCount()
return muser.size();
public class ViewHolder extends RecyclerView.ViewHolder
public TextView username,last_msg;
public CircleImageView profileimage;
public ViewHolder(@NonNull View itemView)
super(itemView);
username = itemView.findViewById(R.id.FriendSingle_userName);
last_msg = itemView.findViewById(R.id.FriendSingle_lastMsg);
profileimage = itemView.findViewById(R.id.FriendSingle_user_img);
//check for last message
private void lastMessage(final String userid, final TextView last_msg)
theLastMessage = "default";
final FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Chats");
reference.addValueEventListener(new ValueEventListener()
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
for (DataSnapshot snapshot : dataSnapshot.getChildren())
Chat chat = snapshot.getValue(Chat.class);
if (firebaseUser != null && chat != null)
if (chat.getReceiver().equals(firebaseUser.getUid()) && chat.getSender().equals(userid) ||
chat.getReceiver().equals(userid) && chat.getSender().equals(firebaseUser.getUid()))
theLastMessage = chat.getMessage();
switch (theLastMessage)
case "default":
last_msg.setText(users.getFullName());
break;
default:
last_msg.setText(theLastMessage);
break;
theLastMessage = "default";
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
);
同样，问题是每当用户点击 recyclerView 项目时，它会显示相同的聊天室，请找出错误并尽快让我知道。
感谢您的宝贵时间
【问题讨论】：
【参考方案1】：根据您发布的内容（似乎缺少 FriendsAdapter.java 的一部分），问题似乎出在您的 FriendsAdapter 中。您可能已经在 Adapter 级别定义了 users 变量，但它应该在 ViewHolder 级别定义或仅用作局部变量。
您在bindViewHolder 方法中调用users = muser.get(position)，因此如果users 在您的onClickListener 被触发时在适配器级别定义，则users 变量将设置为最后一个单元格的用户，而不是与单击的单元格关联的用户对象。
所以，从适配器级别删除users 的定义（可能看起来像这样）：
User users;
或者在bindViewHolder方法中使用users作为局部变量：
User users = muser.get(position);
或者把定义放在你的ViewHolder：
public class ViewHolder extends RecyclerView.ViewHolder
public User users;
public TextView username,last_msg;
public CircleImageView profileimage;
public ViewHolder(@NonNull View itemView)
super(itemView);
username = itemView.findViewById(R.id.FriendSingle_userName);
last_msg = itemView.findViewById(R.id.FriendSingle_lastMsg);
profileimage = itemView.findViewById(R.id.FriendSingle_user_img);
【讨论】：
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