如何使 flutter 返回 firebase 的节点名称列表

Question

`final dbRef = database.child("Blocos");
  dbRef.onValue.listen((event) => {
    event.snapshot.children.forEach((child) {
      if (child.key != null) {
       item.add(child.key.toString());
      }
    })
  });
  print(item);

Firebase Rtdb

when I print it only appears [], how do I make a list of the type [word1, word2] appear? I intend to use the list to make a dropdownbutton afterwards.

Answer 1

first, you need to check, is "blocos" has data or not. You can print on event curly brackets first. I think, the mistakes is you're not make sure, is "blocos" has data or not. Hopefully can help you. Thank you