如何生成 firebase uid

Question

我正在尝试将数据（不是用户）存储在 Firebase 后端。如何生成 Firebase 唯一标识符并将其存储在 child 中？我一直在使用 firebase（DatabaseReference 键）作为记录的唯一标识符，但键为空。

Answer 1

您可以使用push().getKey()获取唯一键

FirebaseDatabase database = FirebaseDatabase.getInstance();
String key = database.getReference("todoList").push().getKey();

Map<String, Object> childUpdates = new HashMap<>();
childUpdates.put( key, todo.toFirebaseObject());
database.getReference("todoList").updateChildren(childUpdates, new DatabaseReference.CompletionListener() {
    @Override
    public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
        if (databaseError == null) {

        }
    }
});

这在 更新特定字段 部分 docs 部分

中进行了解释

This example uses push() to create a post in the node containing posts for all users at /posts/$postid and simultaneously retrieve the key with getKey(). The key can then be used to create a second entry in the user's posts at /user-posts/$userid/$postid.

Answer 2

FirebaseDatabase database = FirebaseDatabase.getInstance();
String key = database.getReference("todoList").push().getKey();

Map<String, Object> childUpdates = new HashMap<>();
childUpdates.put( key, todo.toFirebaseObject());
database.getReference("todoList").updateChildren(childUpdates, new DatabaseReference.CompletionListener() {
    @Override
    public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
        if (databaseError == null) {

        }
    }
});