I have a problem with my code, I don't know if I get it because of onChildAdded or RecyclerView
Simply I want to display messages Inbox on RecyclerView that contains all messages I received from other users, each message contains the last message sent and information about senders such as his name and photo.
Like this
This is my structure
Messages
Receiver_UID
Sender_UID
push
message : "text"
I used 2 nested query to achieve that so firstly I get sender UID, and then I get the last message from another query
dataQuery = FirebaseDatabase.getInstance().getReference("Messages").child(my_Id);
dataQuery.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot getalldata, String s) {
final String sender_UID = getalldata.getKey();
Query lastmess = FirebaseDatabase.getInstance().getReference("Messages").child(my_Id).child(sendUID);
lastmess.orderByKey().limitToLast(1).addChildEventListener(new ChildEventListener() { // last message
@Override
public void onChildAdded(DataSnapshot snap, String s) {
MessModel messages = snap.getValue(MessModel.class);
String Last_message = messages.getMessage();
getUserData(Last_message ,sender_UID);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
And finally I get information of sender by this method
private void getUserData(final String last_message , String sendUID) {
FirebaseDatabase.getInstance().getReference("Users").orderByKey().equalTo(sendUID).addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(final DataSnapshot data, final String s) {
listImessagesitem model = data.getValue(listImessagesitem.class);
name =model.getName();
uid = model.getUid();
//another information
result.add( new listImessagesitem( name ,last_message ,uid, ... another info));
useradapter = new listMessagesAdapter(getActivity(),result);
myList.setAdapter(useradapter);
useradapter.notifyDataSetChanged();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
It works well the first time and when I make refresh as well
The problem is when someone, in the list of messages Inbox, sends me a new message. In this case, if I didn't make refresh, I see two senders with the same information and different last messages ... If he sent again, I see 3 senders with same previous case and so on.
How can I fix it?
I mean How can I add the new message to the user if he already exists in my inbox list
Any help would be appreciated, Thanks
