Query inside a query returning not what I want FireBase, android studio

Question

I have a problem, I would like to populate my FirebaseRecyclerOptions with a query inside another query so I used a method from this question : How to perform join query in Firebase?.

 Query query = FirebaseDatabase.getInstance().getReference()
                .child("Favoris")
                .orderByChild("idUser")
                .equalTo(user.getUid());
        query.addValueEventListener(
                new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot snapshot) {
                        for(DataSnapshot child : snapshot.getChildren()){
                            Map<String, Object> valuesMap = (HashMap<String, Object>) child.getValue();
                            String key = (String) valuesMap.get("idAnnonce");
                            Query query2 = FirebaseDatabase.getInstance().getReference()
                                    .child("Annonces")
                                    .orderByChild("id")
                                    .equalTo(key);
                            query2.addValueEventListener(
                                    new ValueEventListener() {
                                        @Override
                                        public void onDataChange(@NonNull DataSnapshot snapshot) {
                                            for(DataSnapshot child: snapshot.getChildren()){
                                                Annonce annonce = child.getValue(Annonce.class);


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

                                        }
                                    }
                            );
                        }
                    }
                    @Override
                    public void onCancelled(@NonNull DatabaseError error) {
                        Log.d("errror", error.getDetails());
                    }
                }
        );

        query.get().addOnCompleteListener(new OnCompleteListener<DataSnapshot>() {
            @Override
            public void onComplete(@NonNull Task<DataSnapshot> task) {
                if (!task.isSuccessful()) {
                    Log.e("firebase", "Error getting data", task.getException());
                }
                else {
                    Log.d("firebase", String.valueOf(task.getResult().getValue()));
                }
            }
        });

But when I exec my code, the query.get() return object "Favori" from the first query and It's not what I want. I would like to have the Annonce object. I hope someone could help me to resolve my problem.