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解释在这里如果我使用Firebase简单用户名和密码，该如何返回用户列表？密码身份验证

您可以在数据库中将用户的uid设置为 users 该节点存储其他用户的信息。那么你可以得到这个节点下的孩子数。

I am working on an android app based on Firebase and I am creating registration using authentication of users with their email addresses and passwords with method signInWithEmailAndPassword, I am able register multiple users and also able to see user on Firebase console. But, I want to get the list of all the registered users on Firebase Auth. I can get the current user using FirebaseAuth.getInstance().getCurrentUser(). But, I want to list all the registered users. So, is there anyway I can get the list of registered users?

You can't

The explanation is here How do I return a list of users if I use the Firebase simple username & password authentication

You can instead set the user's uid to users node in your database, I use that node to store other user's information. then you can get the number of childs under that node.