电子邮件和密码验证在Android Studio上不可见

<EditText
    android:id="@+id/emailEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textEmailAddress"
    android:hint="Email" />

<EditText
    android:id="@+id/passwordEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textPassword"
    android:hint="Password" />

EditText emailEditText = findViewById(R.id.emailEditText);
EditText passwordEditText = findViewById(R.id.passwordEditText);

String email = emailEditText.getText().toString();
String password = passwordEditText.getText().toString();

// 进行电子邮件和密码验证的逻辑处理