Firestore Query Listener
I listen to changes to a collection with a listener
query.addSnapshotListener(new EventListener<QuerySnapshot>()
When I add first document, listener gets it and it works as I want it to, but then when I add the second document my listener gets this second document and the first one again, then with 3rd it records this 3rd document and the rest 2, and so on.
Can I make it that my listener gets only latest document when it is added, not all of the documents?
EDIT:
query = chatCollectionRef.whereEqualTo("receiverID", userID).whereEqualTo("senderID", targetID);
registration = query.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(@Nullable QuerySnapshot queryDocumentSnapshots, @Nullable FirebaseFirestoreException e) {
if (e != null) {
Log.w("ListenerError", "Listen Failed");
return;
}
for (QueryDocumentSnapshot doc : queryDocumentSnapshots) {
Log.d("ListenerLog", "New Document in Listener")
Item item= doc.toObject(Item.class);
itemList.add(item);
recyclerAdapter.notifyDataSetChanged();
}
}
}
The problem is that when first document is added my listener and recyclerview shows this 
And then, when i add second document, listener gets all two of them, not only the latest one, and my recyclerView looks like this
android firebase google-cloud-firestore asked Nov 22 '18 at 23:51
WiktorWiktor
13711
add a comment |
I listen to changes to a collection with a listener
query.addSnapshotListener(new EventListener<QuerySnapshot>()
When I add first document, listener gets it and it works as I want it to, but then when I add the second document my listener gets this second document and the first one again, then with 3rd it records this 3rd document and the rest 2, and so on.
Can I make it that my listener gets only latest document when it is added, not all of the documents?
EDIT:
query = chatCollectionRef.whereEqualTo("receiverID", userID).whereEqualTo("senderID", targetID);
registration = query.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(@Nullable QuerySnapshot queryDocumentSnapshots, @Nullable FirebaseFirestoreException e) {
if (e != null) {
Log.w("ListenerError", "Listen Failed");
return;
}
for (QueryDocumentSnapshot doc : queryDocumentSnapshots) {
Log.d("ListenerLog", "New Document in Listener")
Item item= doc.toObject(Item.class);
itemList.add(item);
recyclerAdapter.notifyDataSetChanged();
}
}
}
The problem is that when first document is added my listener and recyclerview shows this
And then, when i add second document, listener gets all two of them, not only the latest one, and my recyclerView looks like this
android firebase google-cloud-firestore asked Nov 22 '18 at 23:51
WiktorWiktor
13711
2
Please show the minimal, complete listener that is needed to reproduce the problem. Right now we're missing both whatqueryis, and how you handle theQuerySnapshot.
– Frank van Puffelen
Nov 23 '18 at 1:37
Post your code with database structure
– Lekr0
Nov 23 '18 at 2:47
Please add the code that you using and please also responde with @.
– Alex Mamo
Nov 23 '18 at 9:33
add a comment |
I listen to changes to a collection with a listener
query.addSnapshotListener(new EventListener<QuerySnapshot>()
When I add first document, listener gets it and it works as I want it to, but then when I add the second document my listener gets this second document and the first one again, then with 3rd it records this 3rd document and the rest 2, and so on.
Can I make it that my listener gets only latest document when it is added, not all of the documents?
EDIT:
query = chatCollectionRef.whereEqualTo("receiverID", userID).whereEqualTo("senderID", targetID);
registration = query.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(@Nullable QuerySnapshot queryDocumentSnapshots, @Nullable FirebaseFirestoreException e) {
if (e != null) {
Log.w("ListenerError", "Listen Failed");
return;
}
for (QueryDocumentSnapshot doc : queryDocumentSnapshots) {
Log.d("ListenerLog", "New Document in Listener")
Item item= doc.toObject(Item.class);
itemList.add(item);
recyclerAdapter.notifyDataSetChanged();
}
}
}
The problem is that when first document is added my listener and recyclerview shows this
And then, when i add second document, listener gets all two of them, not only the latest one, and my recyclerView looks like this
android firebase google-cloud-firestore asked Nov 22 '18 at 23:51
WiktorWiktor
13711
I listen to changes to a collection with a listener
query.addSnapshotListener(new EventListener<QuerySnapshot>()
When I add first document, listener gets it and it works as I want it to, but then when I add the second document my listener gets this second document and the first one again, then with 3rd it records this 3rd document and the rest 2, and so on.
Can I make it that my listener gets only latest document when it is added, not all of the documents?
EDIT:
query = chatCollectionRef.whereEqualTo("receiverID", userID).whereEqualTo("senderID", targetID);
registration = query.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(@Nullable QuerySnapshot queryDocumentSnapshots, @Nullable FirebaseFirestoreException e) {
if (e != null) {
Log.w("ListenerError", "Listen Failed");
return;
}
for (QueryDocumentSnapshot doc : queryDocumentSnapshots) {
Log.d("ListenerLog", "New Document in Listener")
Item item= doc.toObject(Item.class);
itemList.add(item);
recyclerAdapter.notifyDataSetChanged();
}
}
}
The problem is that when first document is added my listener and recyclerview shows this
And then, when i add second document, listener gets all two of them, not only the latest one, and my recyclerView looks like this
android firebase google-cloud-firestore android firebase google-cloud-firestore asked Nov 22 '18 at 23:51
WiktorWiktor
13711
asked Nov 22 '18 at 23:51
WiktorWiktor
13711
edited Nov 23 '18 at 13:31
Wiktor
asked Nov 22 '18 at 23:51
WiktorWiktor
13711
asked Nov 22 '18 at 23:51
WiktorWiktor
13711
asked Nov 22 '18 at 23:51
WiktorWiktor
13711
13711
2
Please show the minimal, complete listener that is needed to reproduce the problem. Right now we're missing both whatqueryis, and how you handle theQuerySnapshot.
– Frank van Puffelen
Nov 23 '18 at 1:37
Post your code with database structure
– Lekr0
Nov 23 '18 at 2:47
Please add the code that you using and please also responde with @.
– Alex Mamo
Nov 23 '18 at 9:33
add a comment |
2
Please show the minimal, complete listener that is needed to reproduce the problem. Right now we're missing both whatqueryis, and how you handle theQuerySnapshot.
– Frank van Puffelen
Nov 23 '18 at 1:37
Post your code with database structure
– Lekr0
Nov 23 '18 at 2:47
Please add the code that you using and please also responde with @.
– Alex Mamo
Nov 23 '18 at 9:33
2
2
Please show the minimal, complete listener that is needed to reproduce the problem. Right now we're missing both what
query is, and how you handle the QuerySnapshot.– Frank van Puffelen
Nov 23 '18 at 1:37
Please show the minimal, complete listener that is needed to reproduce the problem. Right now we're missing both what
query is, and how you handle the QuerySnapshot.– Frank van Puffelen
Nov 23 '18 at 1:37
Post your code with database structure
– Lekr0
Nov 23 '18 at 2:47
Post your code with database structure
– Lekr0
Nov 23 '18 at 2:47
Please add the code that you using and please also responde with @.
– Alex Mamo
Nov 23 '18 at 9:33
Please add the code that you using and please also responde with @.
– Alex Mamo
Nov 23 '18 at 9:33
add a comment |
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2
Please show the minimal, complete listener that is needed to reproduce the problem. Right now we're missing both what
queryis, and how you handle theQuerySnapshot.– Frank van Puffelen
Nov 23 '18 at 1:37
Post your code with database structure
– Lekr0
Nov 23 '18 at 2:47
Please add the code that you using and please also responde with @.
– Alex Mamo
Nov 23 '18 at 9:33