firebaseAuth.createUserWithEmailAndPassword（电子邮件，密码）对我不起作用

Question

我正在尝试在Firebase中注册某个应用，但它一直在说不成功。

这是我的代码。

public class RegisterActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText etEmail;
    private EditText etPassword;

    private ProgressDialog progressDialog;

    private FirebaseAuth firebaseAuth;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

        firebaseAuth = FirebaseAuth.getInstance();

        if (firebaseAuth.getCurrentUser() != null){
            //Start profile activity here.
            finish();
            startActivity(new Intent(getApplicationContext(), HomeActivity.class));
        }


        progressDialog = new ProgressDialog(this);


        etEmail = (EditText) findViewById(R.id.editTextEmail);
        etPassword = (EditText) findViewById(R.id.editTextPassword);

        Button btnRegister = (Button) findViewById(R.id.buttonRegister);

        assert btnRegister != null;
        btnRegister.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        registerUser();

    }

    private void registerUser(){

        String email = etEmail.getText().toString().trim();
        String password = etPassword.getText().toString().trim();




        if (TextUtils.isEmpty(email)){
            //Email is empty. Create a toast to enter a email.
            Toast.makeText(this, "Please enter your email address.", Toast.LENGTH_SHORT).show();
            // return to the email field.
            return;
        }

        if (TextUtils.isEmpty(password)){
            //Password is empty. Create a toast to enter a password.
            Toast.makeText(this, "Please enter your password.", Toast.LENGTH_SHORT).show();
            // return to the password field.
            return;
        }


        progressDialog.setMessage("Registration on Process...");
        progressDialog.show();

        firebaseAuth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()){
                            //User is successfully registered.
                            Toast.makeText(RegisterActivity.this, "Registration is successful.", Toast.LENGTH_SHORT).show();

                            //Log in and User will start profile activity.
                            finish();
                            startActivity(new Intent(getApplicationContext(), HomeActivity.class));
                        }else{
                            progressDialog.dismiss();
                            Toast.makeText(RegisterActivity.this, "Registration failed. Please try again.", Toast.LENGTH_SHORT).show();
                        }
                    }
                });

    }
}

我尝试使用电子邮件登录活动，我在FirebaseAuth中手动创建并且成功了。但注册活动经常不成功。 我无法在代码中发现任何错误。你能帮帮我吗？