将唯一ID更改为向Android Firebase发送电子邮件

Question

每当我将其更改为user.getEmail()而不是user.getUid()时，应用程序崩溃。有谁知道背后的原因？

private void saveUserInformation() {
    String name = editTextName.getText().toString().trim();
    String team = editTextTeam.getText().toString().trim();
    String pos = editTextPos.getText().toString().trim();

    UserInformation userInformation = new UserInformation(name, team, pos);

    FirebaseUser user = firebaseAuth.getCurrentUser();

    databaseReference.child(user.getUid()).setValue(userInformation);


    Toast.makeText(this, "Information saved", Toast.LENGTH_LONG).show();

}

以下是我的Firebase数据库结构。

`{ "K05L8cmiqdg3jZapHbhpz219hpG3" : {

},"RmJ1ZfgxmqQ4bENGWCr8Y1dIwO12" : {

} "pHX5yYjzPYTZB0ek3ijeoH7rafD3" : {
}}