使用 Flutter 和 ChatGPT开发简易 Chatbot

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import 'package:chatwithalice/gemini_ai.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: GeminiChatBot(),
    );
  }
}

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import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'openai_service.dart';
import 'model.dart';

class GeminiChatBot extends StatefulWidget {
  const GeminiChatBot({super.key});
  @override
  State<GeminiChatBot> createState() => _GeminiChatBotState();
}

class _GeminiChatBotState extends State<GeminiChatBot> {
  TextEditingController promprController = TextEditingController();
  final OpenAIService openAIService = OpenAIService();
  final List<ModelMessage> prompt = [];

  Future<void> sendMessage() async {
    final message = promprController.text;
    // for prompt
    setState(() {
      promprController.clear();
      prompt.add(
        ModelMessage(isPrompt: true, message: message, time: DateTime.now()),
      );
    });
    // for respond
    final content = message;
    final response = await openAIService.chatGPTAPI(content);
    setState(() {
      prompt.add(
        ModelMessage(
          isPrompt: false,
          message: response,
          time: DateTime.now(),
        ),
      );
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.blue[100],
      appBar: AppBar(
        elevation: 3,
        backgroundColor: Colors.blue[100],
        title: const Text("AI ChatBot"),
      ),
      body: Column(
        children: [
          Expanded(
            child: ListView.builder(
              itemCount: prompt.length,
              itemBuilder: (context, index) {
                final message = prompt[index];
                return userPrompt(
                  isPrompt: message.isPrompt,
                  message: message.message,
                  date: DateFormat('hh:mm a').format(message.time),
                );
              },
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(25),
            child: Row(
              children: [
                Expanded(
                  flex: 20,
                  child: TextField(
                    controller: promprController,
                    style: const TextStyle(color: Colors.black, fontSize: 20),
                    decoration: InputDecoration(
                      border: OutlineInputBorder(
                        borderRadius: BorderRadius.circular(20),
                      ),
                      hintText: "Enter a prompt here",
                    ),
                  ),
                ),
                const Spacer(),
                GestureDetector(
                  onTap: () {
                    sendMessage();
                  },
                  child: const CircleAvatar(
                    radius: 29,
                    backgroundColor: Colors.green,
                    child: Icon(Icons.send, color: Colors.white, size: 32),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Container userPrompt({
    required final bool isPrompt,
    required String message,
    required String date,
  }) {
    return Container(
      width: double.infinity,
      padding: const EdgeInsets.all(15),
      margin: const EdgeInsets.symmetric(
        vertical: 15,
      ).copyWith(left: isPrompt ? 80 : 15, right: isPrompt ? 15 : 80),
      decoration: BoxDecoration(
        color: isPrompt ? Colors.green : Colors.grey,
        borderRadius: BorderRadius.only(
          topLeft: const Radius.circular(20),
          topRight: const Radius.circular(20),
          bottomLeft: isPrompt ? const Radius.circular(20) : Radius.zero,
          bottomRight: isPrompt ? Radius.zero : const Radius.circular(20),
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // for prompt and response
          Text(
            message,
            style: TextStyle(
              fontWeight: isPrompt ? FontWeight.bold : FontWeight.normal,
              fontSize: 18,
              color: isPrompt ? Colors.white : Colors.black,
            ),
          ),
          // for prompt and response time
          Text(
            date,
            style: TextStyle(
              fontSize: 14,
              color: isPrompt ? Colors.white : Colors.black,
            ),
          ),
        ],
      ),
    );
  }
}

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class ModelMessage {
  final bool isPrompt;
  final String message;
  final DateTime time;

  ModelMessage({
    required this.isPrompt,
    required this.message,
    required this.time,
  });
}

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import 'dart:convert';
import 'secrets.dart';
import 'package:http/http.dart' as http;

class OpenAIService {
  final List<Map<String, String>> messages = [];

  Future<String> isArtPromptAPI(String prompt) async {
    try {
      final res = await http.post(
        //Uri.parse('https://api.openai.com/v1/chat/completions'),
        Uri.parse('https://api.chatanywhere.tech/v1/chat/completions'),
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer $openAIAPIKey',
        },
        body: jsonEncode({
          "model": "gpt-3.5-turbo",
          "messages": [
            {
              'role': 'user',
              'content':
                  'Does this message want to generate an AI picture, image, art or anything similar? $prompt . Simply answer with a yes or no.',
            }
          ],
        }),
      );
      print(res.body);
      if (res.statusCode == 200) {
        String content =
            jsonDecode(res.body)['choices'][0]['message']['content'];
        content = content.trim();

        switch (content) {
          case 'Yes':
          case 'yes':
          case 'Yes.':
          case 'yes.':
            final res = await dallEAPI(prompt);
            return res;
          default:
            final res = await chatGPTAPI(prompt);
            return res;
        }
      }
      return 'An internal error occurred';
    } catch (e) {
      return e.toString();
    }
  }

  Future<String> chatGPTAPI(String prompt) async {
    messages.add({
      'role': 'user',
      'content': prompt,
    });
    try {
      final res = await http.post(
        Uri.parse('https://api.chatanywhere.tech/v1/chat/completions'),
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer $openAIAPIKey',
        },
        body: jsonEncode({
          "model": "gpt-3.5-turbo",
          "messages": messages,
        }),
      );

      if (res.statusCode == 200) {
        String content =
            jsonDecode(res.body)['choices'][0]['message']['content'];
        content = content.trim();

        messages.add({
          'role': 'assistant',
          'content': content,
        });
        return content;
      }
      return 'An internal error occurred';
    } catch (e) {
      return e.toString();
    }
  }

  Future<String> dallEAPI(String prompt) async {
    messages.add({
      'role': 'user',
      'content': prompt,
    });
    try {
      final res = await http.post(
        Uri.parse('https://api.chatanywhere.tech/v1/images/generations'),
        headers: {
          'Content-Type': 'application/json',
          'Authorization': 'Bearer $openAIAPIKey',
        },
        body: jsonEncode({
          'prompt': prompt,
          'n': 1,
        }),
      );

      if (res.statusCode == 200) {
        String imageUrl = jsonDecode(res.body)['data'][0]['url'];
        imageUrl = imageUrl.trim();

        messages.add({
          'role': 'assistant',
          'content': imageUrl,
        });
        return imageUrl;
      }
      return 'An internal error occurred';
    } catch (e) {
      return e.toString();
    }
  }
}

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const openAIAPIKey = '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';

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name: chatwithalice
description: "A new Flutter project."
# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
# In Windows, build-name is used as the major, minor, and patch parts
# of the product and file versions while build-number is used as the build suffix.
version: 1.0.0+1

environment:
  sdk: ^3.7.2

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.8
  http: ^1.4.0
  intl: ^0.20.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^5.0.0

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter packages.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/to/resolution-aware-images

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/to/asset-from-package

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/to/font-from-package

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SocketException: Failed host lookup: 'www.xyz.com' (OS Error: No address associated with hostname, errno = 7)

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<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>