CHATGPT

API CLIENT

package com.example.chatgpttest;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class ApiClient {
    private static final String BASE_URL = "https://api.openai.com/v1/";
    public static OpenAIApi getApiService() {
        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
        loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);  // Log request and response bodies
        // Create OkHttp client with interceptor
        OkHttpClient client = new OkHttpClient.Builder()
                .addInterceptor(loggingInterceptor)  // Add the logging interceptor
                .addInterceptor(chain -> {
                    Request request = chain.request().newBuilder()
                            .addHeader("Authorization", "Bearer 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")  // Replace with your actual API key
                            .build();
                    return chain.proceed(request);
                })
                .build();

        // Build Retrofit instance
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .client(client)
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        // Return the API service
        return retrofit.create(OpenAIApi.class);
    }
}

Chat Request:

package com.example.chatgpttest;

import java.util.List;

// Request model
public class ChatRequest {
    private String model;
    private List<Message> messages;

    public ChatRequest(String model, List<Message> messages) {
        this.model = model;
        this.messages = messages;
    }

    public String getModel() {
        return model;
    }

    public List<Message> getMessages() {
        return messages;
    }

    // Getters and Setters
}

Chat Response

package com.example.chatgpttest;

import java.util.List;
import com.example.chatgpttest.Choice;
// Response model
public class ChatResponse {
    private List<Choice> choices;

    public List<Choice> getChoices() {
        return choices;
    }

    public void setChoices(List<Choice> choices) {
        this.choices = choices;
    }
}

Choice

package com.example.chatgpttest;

public class Choice {
    private Message message;

    public Message getMessage() {
        return message;
    }

    public void setMessage(Message message) {
        this.message = message;
    }
}

Fragment Chat xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <EditText
        android:id="@+id/inputText"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:autofillHints="emailAddress"
        android:inputType="text"
        android:hint="@string/hint_enter_message"/>

    <Button
        android:id="@+id/sendButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/send_button_text" />

    <TextView
        android:id="@+id/responseText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/response_placeholder"
        android:paddingTop="16dp" />
</LinearLayout>

Chat Fragment.java

package com.example.chatgpttest;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import retrofit2.Call;
import retrofit2.Response;
import android.util.Log;

import java.util.ArrayList;
import java.util.List;

public class ChatFragment extends Fragment {

    private EditText inputText;
    private TextView responseText;
    private Button sendButton;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_chat, container, false);

        // Initialize UI elements
        inputText = view.findViewById(R.id.inputText);
        responseText = view.findViewById(R.id.responseText);
        sendButton = view.findViewById(R.id.sendButton);

        // Ensure UI components are not null
        if (inputText == null || responseText == null || sendButton == null) {
            Log.e("ChatFragment", "UI elements not properly initialized");
            return view;
        }

        // Set up click listener for the send button
        sendButton.setOnClickListener(v -> {
            String userMessage = inputText.getText().toString();
            if (!userMessage.isEmpty()) {
                sendMessageToApi(userMessage);  // Call API when button is clicked
            } else {
                Log.e("ChatFragment", "User input is empty");
                responseText.setText("Please enter a message.");
            }
        });

        return view;
    }

    // Method to send message to ChatGPT API
    public void sendMessageToApi(String userMessage) {
        Log.d("ChatFragment", "Sending message to API: " + userMessage);

        // Create a message list with the user input
        List<Message> messages = new ArrayList<>();
        messages.add(new Message("user", userMessage));

        // Create ChatRequest object
        ChatRequest chatRequest = new ChatRequest("gpt-3.5-turbo", messages);

        // Get the API service
        OpenAIApi apiService = ApiClient.getApiService();

        Log.d("ChatFragment", "Making API call with request: " + chatRequest.getMessages().get(0).getContent());

        try {
            Call<ChatResponse> call = apiService.getChatResponse(chatRequest);
            Response<ChatResponse> response = call.execute();  // Synchronous call

            // Log entire response object
            Log.d("ChatFragment", "Response received: " + response.toString());

            if (response.isSuccessful() && response.body() != null) {
                ChatResponse chatResponse = response.body();

                // Log entire body to see if something is wrong
                Log.d("ChatFragment", "Response body: " + chatResponse.toString());

                if (chatResponse.getChoices() != null && !chatResponse.getChoices().isEmpty()) {
                    Message message = chatResponse.getChoices().get(0).getMessage();

                    if (message != null && message.getContent() != null) {
                        String gptResponse = message.getContent();
                        Log.d("ChatFragment", "API Success: " + gptResponse);
                        responseText.setText(gptResponse);  // Update UI with response
                    } else {
                        Log.e("ChatFragment", "API Success but message content is null");
                        responseText.setText("Received a response, but the content is null.");
                    }
                } else {
                    Log.e("ChatFragment", "API Success but choices are null or empty");
                    responseText.setText("Received a response, but choices are null or empty.");
                }
            } else {
                // Handle error response
                Log.e("ChatFragment", "API Error: " + response.code() + " - " + response.message());
                if (response.errorBody() != null) {
                    Log.e("ChatFragment", "Error body: " + response.errorBody().string());
                }
                responseText.setText("Failed to get a response. Error code: " + response.code());
            }
        } catch (Exception e) {
            Log.e("ChatFragment", "API Failure: " + e.getMessage());
            responseText.setText("Network error: " + e.getMessage());
        }

Activity main xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="414dp"
        android:layout_height="685dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/openChatButton" />

    <Button
        android:id="@+id/openChatButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginBottom="1dp"
        android:text="Open Chat"
        app:layout_constraintBottom_toTopOf="@+id/fragment_container"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Main activity java

package com.example.chatgpttest;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Load the ChatFragment when the activity is created
        loadFragment(new ChatFragment());
    }

    // Method to load fragments into the activity
    private void loadFragment(Fragment fragment) {
        // Use FragmentManager to begin a fragment transaction
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

        // Replace the content in the activity_main layout with the ChatFragment
        fragmentTransaction.replace(R.id.fragment_container, fragment);
        fragmentTransaction.commit();  // Commit the transaction
    }
}

Message java

package com.example.chatgpttest;

public class Message {
    private String role;
    private String content;

    public Message(String role, String content) {
        this.role = role;
        this.content = content;
    }

    // Getter for content
    public String getContent() {
        return content;
    }

    public void setRole(String role) {
        this.role = role;
    }

    public String getRole() {
        return role;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.ChatGptTest"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>