验证时Firebase .getUID NullPointerException [英] Firebase .getUID NullPointerException when authen

问题描述

注册时我会向数据库添加数据，但是我得到了

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

Java.lang.NullPointerException:尝试在空对象引用上调用虚拟方法'java.lang.String com.google.firebase.auth.FirebaseUser.getUid()'

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

我尝试了一些方法，但是不起作用

I try something, but don't work

这是我的代码

    auth = FirebaseAuth.getInstance();

    database = FirebaseDatabase.getInstance();

    mRef = database.getReference();
    FirebaseUser user = auth.getCurrentUser();
    userID = user.getUid();
btnSignUp.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final String fname = etFname.getText().toString().trim();
            final String lname = etLname.getText().toString().trim();
            final String id_card = etIdCard.getText().toString().trim();
            final String email = etEmail.getText().toString().trim();
            final String mobile = etMobile.getText().toString().trim();
            String password = etPassword.getText().toString().trim();

            if (TextUtils.isEmpty(email)){
                Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
                return;
            }

            if (TextUtils.isEmpty(password)){
                Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
                return;
            }

            if (TextUtils.isEmpty(fname)){
                Toast.makeText(getApplicationContext(), "Enter FirstName!", Toast.LENGTH_SHORT).show();
                return;
            }

            if (password.length() < 8) {
                Toast.makeText(getApplicationContext(), "Password too short, enter minimum 8 characters!", Toast.LENGTH_SHORT).show();
                return;
            }

            progressBar.setVisibility(View.VISIBLE);

            auth.createUserWithEmailAndPassword(email,password)
                    .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {


                            if (!task.isSuccessful()) {

                                UserInfo userInfo = new UserInfo(fname,lname,id_card,mobile,email);
                                mRef.child("users").child(userID).setValue(userInfo);
                                etFname.setText("");
                                etLname.setText("");
                                etIdCard.setText("");
                                etMobile.setText("");
                                etEmail.setText("");
                                Toast.makeText(RegisterActivity.this, "Authentication failed." + task.getException(),
                                        Toast.LENGTH_SHORT).show();

                            } else {
                                Toast.makeText(RegisterActivity.this, "Register Successfully" + task.isSuccessful(), Toast.LENGTH_SHORT).show();
                                progressBar.setVisibility(View.GONE);

                                finish();
                            }

                        }
                    });
        }
    });


}

现在得到这样的新错误 java.lang.NoSuchMethodError:类Lcom/google/firebase/FirebaseApp中没有虚拟方法zzTt()Z；或其上级类("com.google.firebase.FirebaseApp"的声明出现在/data/app/com.example.androiddev.army31-1/split_lib_dependencies_apk.apk:classes36.dex中)

And now get new error like this java.lang.NoSuchMethodError: No virtual method zzTt()Z in class Lcom/google/firebase/FirebaseApp; or its super classes (declaration of 'com.google.firebase.FirebaseApp' appears in /data/app/com.example.androiddev.army31-1/split_lib_dependencies_apk.apk:classes36.dex)

现在我可以修复它，因为在gradle上编译的版本不相同

Now I can fix it because compile on gradle not same version

也有同样的事情

推荐答案

您在代码中提到的身份验证是什么类型，请用单行替换它并检查是否有效

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();

您还可以查看文档中完整的工作代码示例: https://firebase.google.com/docs/auth/android/manage-users

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

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