FirebaseAuth.getCurrentUser() 返回空值 [英] FirebaseAuth.getCurrentUser() is returning null value

问题描述

FirebaseAuth.getCurrentUser() 正在返回 null 值.以前我的代码运行良好，但几天后它返回 currentUser 作为 null.

FirebaseAuth.getCurrentUser() is returning null value. Previously my code worked fine but since couple of days its returning currentUser as null.

此外，我在另一台设备上试用了我的应用程序，在该设备上使用相同的代码一切正常.

Also I've tried my app on another device and in that device everything is working fine with the same code.

mAuth=FirebaseAuth.getInstance();
mCurrentUser=mAuth.getCurrentUser()
mUserDatabase=FirebaseDatabase.getInstance().getReference().child("Users")
                              .child(mCurrentUser.getUid());

异常:

Caused by: java.lang.NullPointerException: Attempt to invoke方法'java.lang.Stringcom.google.firebase.auth.FirebaseUser.getUid()' 在一个空对象上参考

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.firebase.auth.FirebaseUser.getUid()' on a null object reference

我已经尝试在我的设备上擦除应用数据并卸载并重新安装我的应用，但没有任何效果.

I have already tried erasing app data and uninstalling and reinstalling my app on my device but nothing worked.

我的设备或 Firebase 有问题吗?

Is there a problem with my device or Firebase?

推荐答案

看起来用户未登录到您的应用，这会导致 mCurrentUser.getUid() 抛出异常.

It looks like the user isn't signed into your app, which causes mCurrentUser.getUid() to throw an exception.

解决方案是只调用 getUid() 如果有登录的 yser:

The solution is to only call getUid() is there is a signed-in yser:

mCurrentUser=mAuth.getCurrentUser();
if (mCurrentUser != null) {
    mUserDatabase=FirebaseDatabase.getInstance().getReference().child("Users")
                          .child(mCurrentUser.getUid());
}

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