当然，关于otp_autofill_plus插件在Flutter中的使用，以下是一个简单的代码示例，展示了如何集成和使用这个插件来实现一次性密码（OTP）的自动填充功能。

首先，确保你已经在pubspec.yaml文件中添加了otp_autofill_plus依赖：

dependencies:
  flutter:
    sdk: flutter
  otp_autofill_plus: ^x.y.z  # 请替换为最新版本号

然后，运行flutter pub get来安装依赖。

接下来，是一个完整的Flutter应用示例，展示了如何使用otp_autofill_plus：

import 'package:flutter/material.dart';
import 'package:otp_autofill_plus/otp_autofill_plus.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'OTP Autofill Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: OtpScreen(),
    );
  }
}

class OtpScreen extends StatefulWidget {
  @override
  _OtpScreenState createState() => _OtpScreenState();
}

class _OtpScreenState extends State<OtpScreen> {
  final TextEditingController _controller1 = TextEditingController();
  final TextEditingController _controller2 = TextEditingController();
  final TextEditingController _controller3 = TextEditingController();
  final TextEditingController _controller4 = TextEditingController();
  final TextEditingController _controller5 = TextEditingController();
  final TextEditingController _controller6 = TextEditingController();

  @override
  void dispose() {
    _controller1.dispose();
    _controller2.dispose();
    _controller3.dispose();
    _controller4.dispose();
    _controller5.dispose();
    _controller6.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('OTP Autofill Demo'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: <Widget>[
            TextField(
              controller: _controller1,
              keyboardType: TextInputType.number,
              maxLength: 1,
              decoration: InputDecoration(
                labelText: '1',
                border: OutlineInputBorder(),
              ),
              inputFormatters: [
                FilteringTextInputFormatter.digitsOnly,
              ],
              onSubmitted: (value) {
                FocusScope.of(context).requestFocus(_controller2.focusNode);
              },
            ),
            TextField(
              controller: _controller2,
              keyboardType: TextInputType.number,
              maxLength: 1,
              decoration: InputDecoration(
                labelText: '2',
                border: OutlineInputBorder(),
              ),
              inputFormatters: [
                FilteringTextInputFormatter.digitsOnly,
              ],
              onSubmitted: (value) {
                FocusScope.of(context).requestFocus(_controller3.focusNode);
              },
            ),
            TextField(
              controller: _controller3,
              keyboardType: TextInputType.number,
              maxLength: 1,
              decoration: InputDecoration(
                labelText: '3',
                border: OutlineInputBorder(),
              ),
              inputFormatters: [
                FilteringTextInputFormatter.digitsOnly,
              ],
              onSubmitted: (value) {
                FocusScope.of(context).requestFocus(_controller4.focusNode);
              },
            ),
            TextField(
              controller: _controller4,
              keyboardType: TextInputType.number,
              maxLength: 1,
              decoration: InputDecoration(
                labelText: '4',
                border: OutlineInputBorder(),
              ),
              inputFormatters: [
                FilteringTextInputFormatter.digitsOnly,
              ],
              onSubmitted: (value) {
                FocusScope.of(context).requestFocus(_controller5.focusNode);
              },
            ),
            TextField(
              controller: _controller5,
              keyboardType: TextInputType.number,
              maxLength: 1,
              decoration: InputDecoration(
                labelText: '5',
                border: OutlineInputBorder(),
              ),
              inputFormatters: [
                FilteringTextInputFormatter.digitsOnly,
              ],
              onSubmitted: (value) {
                FocusScope.of(context).requestFocus(_controller6.focusNode);
              },
            ),
            TextField(
              controller: _controller6,
              keyboardType: TextInputType.number,
              maxLength: 1,
              decoration: InputDecoration(
                labelText: '6',
                border: OutlineInputBorder(),
              ),
              inputFormatters: [
                FilteringTextInputFormatter.digitsOnly,
              ],
              onEditingComplete: () {
                // OTP entered completely, perform action
                String otp = _controller1.text +
                    _controller2.text +
                    _controller3.text +
                    _controller4.text +
                    _controller5.text +
                    _controller6.text;
                print('OTP: $otp');
              },
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () async {
                // Simulate fetching OTP
                // Here you would typically request an OTP from your server
                // and display it to the user via SMS/Email/etc.
                // For demo purposes, we'll just simulate filling the OTP
                await OtpAutofill.fillOtp(
                  context,
                  code: '123456',
                  message: 'Your OTP is 123456',
                );
              },
              child: Text('Simulate OTP'),
            ),
          ],
        ),
      ),
    );
  }
}

在这个示例中，我们创建了六个TextField来分别接收OTP的每一位数字。每个TextField都设置了maxLength为1，并且只接受数字输入。当用户输入完一个数字后，焦点会自动跳转到下一个TextField。当最后一个TextField完成编辑时，会拼接所有的数字并打印出来。

此外，我们还添加了一个按钮来模拟OTP的填充。在实际应用中，这个按钮可能会触发向用户发送OTP的操作（如通过SMS）。在这个示例中，我们直接调用OtpAutofill.fillOtp方法来模拟填充OTP。

请注意，为了使OtpAutofill.fillOtp方法正常工作，你的应用需要满足一些条件，比如正确的Android和iOS配置，以及正确的SMS检索权限等。这些配置通常涉及到操作系统的特定设置和权限请求，具体细节可以参考otp_autofill_plus的官方文档。