Firebase .getUID NullPointerException when authen

Question

I will add data to database when I register, but I got

Java.lang.NullPointerException: Attempt to invoke virtual method \'java.lang.String com.google.firebase.auth.

Answer 1

What is the type of auth you have mentioned in the code, Replace it with single line and check if it works

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

You may also check the documentation for full working code example: https://firebase.google.com/docs/auth/android/manage-users