How to retrieve child (auto-increment) name in firebase

Question

Update : recyclerview , detail

How can I retrieve children underlined by red !! I want to display it in RecyclerView.

This is the code how I save data in Firebase :

long OrderNum = 1;

DatabaseReference newPost = reference.child(refernce);
newPost.child("refernce").setValue(refernce);
newPost.child("nompdv").setValue(nompdv);
newPost.child("etat").setValue(etat);
newPost.child("datecommande").setValue(datecommande);
newPost.child("user_id").setValue(uid);
newPost.child("produitcommande"+ OrderNum++).setValue(produitcommande);

Answer 1

Since you can have multiple produitcommande1, produitcommande2, and so on, a more feasible structure would be to add the products in Map, as seen below:

Firebase-root
  |
  --- commande
        |
        --- KAKJQBUX
              |
              --- datecommande: "10-11-2021 15:15"
              |
              --- produitcommande
                    |
                    --- D2: true
                    |
                    --- D3: true

In this way, you can add as many products as you want. To read them, simply get the node as a Map object and integrate it through the records and only get the keys. If you want to have the produitcommande as a field in a class, then simply add it as a Map<String, Object>.