Items in RealtimeDatabase not added to collection

Asked Jul 12 '21 at 18:51

Active Jul 15 '21 at 18:19

Viewed 27 times

HashSet<String> timeSet = new HashSet<>();

MainActivity.dbreference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull @NotNull DataSnapshot snapshot) {
for (DataSnapshot s : snapshot.child("users").child(MainActivity
                              .currentUser.getUid()).child("timetable").getChildren()) 
    {
        timeSet.add(s.getKey());
    }
}

@Override
public void onCancelled(@NonNull @NotNull DatabaseError error) {}});

Log.d(TAG, timeSet.toString());

This code was supposed to added to timeSet all keys, which are in this path (they are there), but output to log was showed, what set is empty

Why?

edited Jul 15 '21 at 18:19

asked Jul 12 '21 at 18:51

Никита Попов

1

You're not showing where you log the output, but my guess is that you're doing that outside of `onDataChange`. All code that needs the data from the database must be *inside* `onDataChange`. See https://stackoverflow.com/questions/50434836/getcontactsfromfirebase-method-return-an-empty-list/50435519#50435519 – Frank van Puffelen Jul 12 '21 at 18:54
How do you check the output? – Alex Mamo Jul 13 '21 at 06:33
@AlexMamo for Log.d(TAG, timeSet.toString()) – Никита Попов Jul 13 '21 at 14:17
1

Please edit your question and show us the place where you are using that log statement. – Alex Mamo Jul 15 '21 at 14:23

Items in RealtimeDatabase not added to collection

0 Answers0