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flutter chatgpt app open ai functionality

How To Build Flutter ChatGPT App [Free Source Code]

Posted on February 5, 2023February 5, 2023 By ZeeshanAli No Comments on How To Build Flutter ChatGPT App [Free Source Code]

This Flutter tutorial will teach us how to build the Flutter ChatGPT app properly. Everything will be discussed step by step and with a proper practical example in order for better understanding.

The complete source code will also be provided at the end. But make sure to follow all the steps as every step is crucial in creating this chat GPT app in Flutter.

Introduction: Flutter ChatGPT App

You may already know the trend of ChatGPT. It gives the users a unique messaging experience that is powered by Artificial Intelligence. We just have to provide it an input and it’ll generate an appropriate response to this input using natural language processing and machine learning algorithms.

In this tutorial, we’ll learn how to create a Flutter chatBot app. We’ll understand the following concepts:

Create UI – It’s used to take inputs from the user and display the response data.

Configurations – We’ll import the required package in order to use chatGPT in the Flutter app.

Operations – We’ll go through the required functions that are used to send and receive data.

Implementing Flutter ChatGPT App (Step By Step)

Follow the below steps and don’t skip any, or else you may run into some problems.

Step 1: Import Chat GPT SDK Package

  chat_gpt_sdk:
    git:
      url: https://github.com/iampawan/Flutter-ChatGPT.git
Import this package in the dependencies section of your project’s pubspec.yaml file as shown in the below image.

flutter chat gpt sdk package in flutter pubspec yaml file

Don’t forget to use the git specified above. Run flutter pub get into your terminal to get the packages. You can also use the top-right download icon to install packages. If some errors occurred, then try upgrading the dart SDK by running flutter upgrade in the terminal.
import 'package:chat_gpt_sdk/chat_gpt_sdk.dart';

Then use this statement in the dart file where you want to use the chat GPT SDK.

Step 2: Get the API Key

https://beta.openai.com/account/api-keys

We’ve to get our own API key using this URL. We’ll need it in order to get access to the information.

Step 3: Create UI

We’ve created a simple Flutter template that will show the list of input and responses using the Flutter list view builder. Also, we’ve used the Flutter textfield widget to get the input(question) from the user. See the below image.

flutter chat gpt app complete ui with functionality

Flutter widgets and other Flutter concepts that are used in creating this UI are as follows.

Flutter container widget

Flutter text widget

Flutter column widget

Flutter row widget

Flutter textfield widget

Flutter circular progress indicator widget

Flutter padding widget

Flutter appbar widget

Flutter sized box widget

Flutter listview builder

Flutter if else statement

Flutter set state

Flutter expanded widget

Check out our previous articles in case we miss some widgets. Also, we’ve written detailed articles on these Flutter widgets so do check them out as well.

Step 4: Coding

  TextEditingController question = TextEditingController();
It’s used to store the user input. We’ll use this data to get the desired information.
  final List<dynamic> messagesList = [];

This list will store the messages. It’s a list of maps. It’ll include questions and answers.

    ChatGPT? chatGPT;
    StreamSubscription? subscription;
It’s used to access open AI.

Functions

  @override
  void initState() {
    super.initState();
    chatGPT = ChatGPT.instance.builder(
        "use your own api key here" // https://beta.openai.com/account/api-keys
        );
  }
Function to Send and Receive Information
void sendMessage() {
    setState(() {
      showLoading = true;
      if (question.text.isNotEmpty) {
        messagesList.add({'sender': 'Me', 'text': question.text});
      }

      String questionData = question.text;
      question.clear();

      final request = CompleteReq(
          prompt: questionData, model: kTranslateModelV3, max_tokens: 200);
      subscription =
          chatGPT!.onCompleteStream(request: request).listen((responseData) {

        setState(() {});
        if (showLoading) {
          messagesList.add(
              {'sender': 'Bot', 'text': responseData!.choices[0].text.trim()});
        }
        showLoading = false;

      });
    });
  }

This function will get the data(answer) using the question provided by the user.

Dispose
  @override
  void dispose() {
    chatGPT!.close();
    question.dispose();
    subscription?.cancel();
    super.dispose();
  }

Step 5: Test the Flutter ChatGPT App

flutter chat gpt open ai app complete ui with functionality

flutter chat gpt open ai app complete ui with proper functionality

flutter opern ai chatgpt app with working functionality

So this is how we can easily create the Flutter ChatGPT app. Hope you like this post and have learned a lot from it. Don’t hesitate to share it with other Flutter developers.

Ask if you have any questions/suggestions regarding this Flutter ChatGPT app. We’d love to read it.

The complete source code is given in the below section.

Flutter ChatGPT App Complete Source Code

import 'dart:async';
import 'package:chat_gpt_sdk/chat_gpt_sdk.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        debugShowCheckedModeBanner: false,
        title: 'Flutter ChatGPT App',
        home: ChatGPTScreen());
  }
}

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

class _ChatGPTScreenState extends State<ChatGPTScreen> {

  TextEditingController question = TextEditingController();
  final List<dynamic> messagesList = [];
  ChatGPT? chatGPT;
  StreamSubscription? subscription;
  bool showLoading = false;

  @override
  void initState() {
    super.initState();
    chatGPT = ChatGPT.instance.builder(
        "user your own API key here"    // https://beta.openai.com/account/api-keys
      );
  }

  void sendMessage() {
    setState(() {
      showLoading = true;
      if (question.text.isNotEmpty) {
        messagesList.add({'sender': 'Me', 'text': question.text});
      }
   
      final request = CompleteReq(
          prompt: question.text, model: kTranslateModelV3, max_tokens: 200);
      question.clear();

      subscription =
          chatGPT!.onCompleteStream(request: request).listen((responseData) {
        setState(() {});

        if (showLoading) {
          messagesList.add(
              {'sender': 'Bot', 'text': responseData!.choices[0].text.trim()});
        }

        showLoading = false;
      });
    });
  }

  @override
  void dispose() {
    chatGPT!.close();
    question.dispose();
    subscription?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        backgroundColor: Colors.blue.shade900,
        title: Text('Flutter ChatGPT'),
      ),
      body: SizedBox(
        height: double.infinity,
        width: double.infinity,
        child: Column(children: [questionAnswersList(), inputTextField()]),
      ),
    );
  }

  Widget inputTextField() {
    return Align(
      alignment: Alignment.bottomCenter,
      child: Padding(
        padding: EdgeInsets.all(11),
        child: TextField(
          controller: question,
          readOnly: showLoading ? true : false,
          cursorColor: Colors.blue.shade400,
          decoration: InputDecoration(
              enabledBorder: OutlineInputBorder(
                  borderSide:
                      BorderSide(color: Colors.blue.shade200, width: .5)),
              focusedBorder: OutlineInputBorder(
                  borderSide: BorderSide(color: Colors.blue.shade300)),
              hintText:
                  showLoading ? 'AI is writing...' : 'Ask your question...',
              hintStyle: TextStyle(color: Colors.grey.shade500, fontSize: 14),
              suffixIcon: InkWell(
                onTap: (){
                      if(question.text.isNotEmpty){
                              sendMessage();

                             }
                       },
                child: showLoading
                    ? Padding(
                        padding: EdgeInsets.all(11),
                        child: CircularProgressIndicator(
                          strokeWidth: 1.7,
                        ),
                      )
                    : Icon(
                        Icons.send,
                        color: Colors.blue.shade900,
                      ),
              )),
        ),
      ),
    );
  }
  Widget questionAnswersList() {
    return Expanded(
      child: ListView.builder(
          itemCount: messagesList.length,
          padding: EdgeInsets.symmetric(vertical: 21),
          itemBuilder: ((context, index) {
            return Padding(
              padding: EdgeInsets.all(11),
              child: SizedBox(
                child: Row(
                  children: [
                    Container(
                      padding: EdgeInsets.all(11),
                      decoration: BoxDecoration(
                          shape: BoxShape.circle,
                          color: messagesList[index]['sender'] == 'Me'
                              ? Colors.white
                              : Colors.blue.shade900,
                          boxShadow: [
                            BoxShadow(
                                color: Colors.grey.shade300,
                                blurRadius: 3,
                                spreadRadius: 1,
                                offset: Offset(1, 1))
                          ]),
                      child: Text(
                        messagesList[index]['sender'],
                        style: TextStyle(
                            color: messagesList[index]['sender'] == 'Bot'
                                ? Colors.white
                                : Colors.blue.shade900,
                            fontSize: 13),
                      ),
                    ),
                    Expanded(
                      child: Container(
                        margin: EdgeInsets.only(left: 11),
                        padding: EdgeInsets.all(11),
                        decoration: BoxDecoration(
                            borderRadius: BorderRadius.circular(11),
                            color: Colors.white,
                            boxShadow: [
                              BoxShadow(
                                  color: Colors.grey.shade300,
                                  blurRadius: 3,
                                  spreadRadius: 1,
                                  offset: Offset(1, 1))
                            ]),
                        child: Text(
                          messagesList[index]['text'],
                          style: TextStyle(color: Colors.black87, fontSize: 14),
                        ),
                      ),
                    )
                  ],
                ),
              ),
            );
          })),
    );
  }
}

Conclusion

In conclusion, we hope you now have a detailed and practical understanding of how to implement the Flutter chatGPT app. We’d be very glad to have your valuable feedback.

We’d also be glad to see you visit our other tutorials on Flutter app development and Python programming. Thank you for reading this article.

 

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