无法关闭自定义AlertDialog

import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class CustomAlertDialogExample {

    private AlertDialog alertDialog;

    public void showCustomDialog(Context context) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        LayoutInflater inflater = LayoutInflater.from(context);
        View dialogView = inflater.inflate(R.layout.custom_dialog_layout, null);

        EditText editText = dialogView.findViewById(R.id.editText);
        Button cancelButton = dialogView.findViewById(R.id.btnCancel);
        Button confirmButton = dialogView.findViewById(R.id.btnConfirm);

        builder.setView(dialogView);
        alertDialog = builder.create();

        cancelButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                alertDialog.dismiss(); // 关闭对话框
            }
        });

        confirmButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 处理确认操作
                String inputText = editText.getText().toString();
                // 执行相关逻辑
                alertDialog.dismiss(); // 关闭对话框
            }
        });

        alertDialog.show();
    }
}