当然，以下是如何在Flutter项目中使用aes_crypt_null_safe插件进行AES加密和解密的示例代码。

首先，你需要在你的pubspec.yaml文件中添加依赖项：

dependencies:
  flutter:
    sdk: flutter
  aes_crypt_null_safe: ^1.0.0  # 请注意版本号，使用最新的稳定版本

然后运行flutter pub get来安装依赖。

以下是一个完整的示例，展示了如何使用aes_crypt_null_safe进行加密和解密：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('AES Encryption Example'),
        ),
        body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: MyHomePage(),
        ),
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final TextEditingController _plainTextController = TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  String? _encryptedText;
  String? _decryptedText;

  void _encrypt() {
    final plainText = _plainTextController.text;
    final password = _passwordController.text;

    if (plainText.isEmpty || password.isEmpty) {
      return;
    }

    final key = AesCrypt.generateKeyFromPassword(password!, length: 32);
    final aes = AesCrypt(key);
    final encrypted = aes.encrypt(plainText);

    setState(() {
      _encryptedText = encrypted;
      _decryptedText = null;
    });
  }

  void _decrypt() {
    final encryptedText = _encryptedText ?? '';
    final password = _passwordController.text;

    if (encryptedText.isEmpty || password.isEmpty) {
      return;
    }

    final key = AesCrypt.generateKeyFromPassword(password!, length: 32);
    final aes = AesCrypt(key);
    final decrypted = aes.decrypt(encryptedText);

    setState(() {
      _decryptedText = decrypted;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        TextField(
          controller: _plainTextController,
          decoration: InputDecoration(labelText: 'Plain Text'),
          maxLines: 4,
        ),
        SizedBox(height: 16),
        TextField(
          controller: _passwordController,
          decoration: InputDecoration(labelText: 'Password'),
          obscureText: true,
        ),
        SizedBox(height: 16),
        ElevatedButton(
          onPressed: _encrypt,
          child: Text('Encrypt'),
        ),
        SizedBox(height: 16),
        if (_encryptedText != null)
          Text(
            'Encrypted Text: $_encryptedText',
            style: TextStyle(color: Colors.blue),
          ),
        SizedBox(height: 16),
        if (_decryptedText != null)
          Text(
            'Decrypted Text: $_decryptedText',
            style: TextStyle(color: Colors.green),
          ),
        SizedBox(height: 16),
        if (_encryptedText != null)
          ElevatedButton(
            onPressed: _decrypt,
            child: Text('Decrypt'),
          ),
      ],
    );
  }
}

// Helper function to make Column a widget that can be used directly in Scaffold's body
Widget Column({required List<Widget> children, CrossAxisAlignment? crossAxisAlignment}) {
  return Center(
    child: Container(
      constraints: BoxConstraints(maxWidth: 600),
      child: Column(
        crossAxisAlignment: crossAxisAlignment ?? CrossAxisAlignment.center,
        children: children,
      ),
    ),
  );
}

在这个示例中，我们创建了一个简单的Flutter应用，它包含两个TextField用于输入明文和密码，以及两个ElevatedButton用于触发加密和解密操作。加密后的文本和解密后的文本分别显示在页面上。

注意事项

1. 密码安全：在实际应用中，密码存储和传输需要非常小心，不应以明文形式出现在客户端代码中。
2. 密钥管理：生成和使用密钥应遵守最佳安全实践。
3. 错误处理：在实际应用中，应该添加错误处理逻辑，例如捕获和显示加密/解密过程中可能出现的异常。

希望这个示例对你有帮助！