Cannot fetch messages from another user FirebaseDatabase - firebase

Question

This is a simple chat messaging app, using Firebase Realtime Database and the Authentication. I have successfully created the database, but I cannot fetch the message from one user to another. Because, when I send the message/click the send button, it creates different nodes, I think its a string node with quotation mark in the name. The node structure I created is user-messages --> fromId(current user uid) --> toUid(to whom the messages are sent).
To make more clear explanation, this is the screenshot of what happened.
I think the problem is, it creates a different nodes with the "uid", which means string. So the database has two nodes, one with the "...", and the other the normal one. For some info, I use some library such as Picasso image load, groupie, and parcelize.
This is the source code for the ChatLogActivity
import...
class ChatLogActivity : AppCompatActivity() {
companion object {
val TAG = "ChatLog"
}
val adapter = GroupAdapter<ViewHolder>()
var toUser: User? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_chat_log)
recyclerview_chat_log.adapter = adapter
toUser = intent.getParcelableExtra(NewMessageActivity.USER_KEY)
titleChatLog.text = toUser?.nama
listenForMessages()
arrowBack.setOnClickListener {
finish()
}
send_button_chat_log.setOnClickListener {
Log.d(TAG, "Attempt to send message.....")
performSendMessage()
}
}
private fun listenForMessages() {
val fromId = FirebaseAuth.getInstance().uid
val toId = toUser?.uid
val ref = FirebaseDatabase.getInstance().getReference("/user-messages/$fromId/$toId")
ref.addChildEventListener(object : ChildEventListener {
override fun onChildAdded(p0: DataSnapshot, p1: String?) {
val chatMessage = p0.getValue(ChatMessage::class.java)
if (chatMessage != null) {
Log.d(TAG, chatMessage.text)
if (chatMessage.fromId == FirebaseAuth.getInstance().uid) {
val currentUser = LatestMessageActivity.currentUser?: return
adapter.add(ChatFromItem(chatMessage.text, currentUser))
} else {
adapter.add(ChatToItem(chatMessage.text, toUser!!))
}
}
}
override fun onCancelled(p0: DatabaseError) {
}
override fun onChildChanged(p0: DataSnapshot, p1: String?) {
}
override fun onChildMoved(p0: DataSnapshot, p1: String?) {
}
override fun onChildRemoved(p0: DataSnapshot) {
}
})
}
private fun performSendMessage() {
val text = edittext_chat_log.text.toString()
val fromId = FirebaseAuth.getInstance().uid
val user = intent.getParcelableExtra<User>(NewMessageActivity.USER_KEY)
val toId = user.uid
val ref = FirebaseDatabase.getInstance().getReference("/user-messages/$fromId/$toId").push()
val toRef = FirebaseDatabase.getInstance().getReference("/user-messages/$toId/$fromId ").push()
if (fromId == null) return
val chatMessage = ChatMessage(ref.key!!, text, fromId, toId, System.currentTimeMillis() / 1000)
ref.setValue(chatMessage)
.addOnSuccessListener {
Log.d(TAG, "Save our chat message: ${ref.key}")
edittext_chat_log.text.clear()
recyclerview_chat_log.scrollToPosition(adapter.itemCount - 1)
}
toRef.setValue(chatMessage)
}
}
class ChatFromItem(val text: String, val user: User) : Item<ViewHolder>() {
override fun getLayout(): Int {
return R.layout.chat_from_row
}
override fun bind(viewHolder: ViewHolder, position: Int) {
val uri = user.profileImageUrl
val targetImageView = viewHolder.itemView.imageViewFrom
Picasso.get().load(uri).into(targetImageView)
viewHolder.itemView.textViewFrom.text = text
}
}
class ChatToItem(val text: String, val user: User) : Item<ViewHolder>() {
override fun getLayout(): Int {
return R.layout.chat_to_row
}
override fun bind(viewHolder: ViewHolder, position: Int) {
val uri = user.profileImageUrl
val targetImageView = viewHolder.itemView.imageViewTo
Picasso.get().load(uri).into(targetImageView)
viewHolder.itemView.textViewTo.text = text
}
}
And this is the ChatMessage, class that store the messages.
class ChatMessage(val id:String, val text: String, val fromId: String, val toId: String, val timeStamp: Long) {
constructor(): this("", "", "", "", -1)
}
I'm very glad if anyone can help this problem. Thank you