I have the following DB structure:
Users
Test
ID:1
category:2
Test1
ID:2
category:3
Test3:
ID:3
category:2
Now I want to listen to any changes on Users child that only have category value 2.
How I can do that in Firebase.
as David Ibrahim says, you can use query to listen changes for the category with that value 2. You can something like this.
Query queryCategory = FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("category").equalTo(2);
queryCategory.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});