您可以将该ID作为用户对象的属性存储在数据库中，但更优雅的方法是使用uid而不是该随机密钥由push()方法提供.因此，一旦通过身份验证，就可以使用以下代码行获取uid:

You can store that id in the database as a property of your User object but a more elegant way would be to use the uid and not that random key provided by the push() method. So once you are authenticated, you can get the uid, using the following line of code:

String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();