How to perform network requests using Retrofit…

Adding dependencies: In the module's build.gradle, add Retrofit and a converter (e.g., Gson).

dependencies {
    implementation 'com.squareup.retrofit2:retrofit:2.11.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.11.0'
}

Creating API interface: Define an interface with Retrofit annotations describing HTTP methods, paths, and request parameters.

public interface ApiService {

    @GET("users/{id}")
    Call<User> getUser(@Path("id") int userId);

    @POST("users")
    Call<User> createUser(@Body User user);
}

Creating Retrofit instance: Initialize Retrofit with a base URL and a converter.

Retrofit retrofit = new Retrofit.Builder()
    .baseUrl("https://api.example.com/") // Base URL
    .addConverterFactory(GsonConverterFactory.create()) // Using Gson converter
    .build();

Creating API service instance: Obtain an instance of the API interface from the created Retrofit.
```
ApiService apiService = retrofit.create(ApiService.class);
```

Executing a request: Call the interface method to perform the request. There are two main ways:

Synchronous: (Better to avoid on the main UI thread)

try {
    Response<User> response = apiService.getUser(123).execute();
    if (response.isSuccessful()) {
        User user = response.body();
        // Handle data
    } else {
        // Handle errors
    }
} catch (IOException e) {
     // Handle network errors
}

Asynchronous: (Recommended for UI thread)

apiService.getUser(123).enqueue(new Callback<User>() {
    @Override
    public void onResponse(Call<User> call, Response<User> response) {
        if (response.isSuccessful()) {
            User user = response.body();
            // Handle data on main thread
        } else {
            // Handle errors
        }
    }

    @Override
    public void onFailure(Call<User> call, Throwable t) {
        // Handle network errors
    }
});

Data models: Create data model classes (POJO) for automatic JSON to Java object conversion using a converter (e.g., Gson).
```
public class User {
    private int id;
    private String name;
    // getters and setters
}
```
Network access permission: Don't forget to add the permission in AndroidManifest.xml.
```
<uses-permission android:name="android.permission.INTERNET"/>
```

How to perform network requests using Retrofit?