安卓收件服务器怎么填

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

import java.util.concurrent.TimeUnit;

import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class MainActivity extends AppCompatActivity {
    private static final String API_URL = "https://example.com/api";
    private Retrofit retrofit;
    private ApiService apiService;

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

        retrofit = new Retrofit.Builder()
                .baseUrl(API_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        apiService = retrofit.create(ApiService.class);

        // 连接到服务器并发送请求
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .connectTimeout(30, TimeUnit.SECONDS)
                .readTimeout(30, TimeUnit.SECONDS)
                .build();

        Request request = new Request.Builder()
                .url(API_URL)
                .build();

        Response response = okHttpClient.newCall(request).execute();
        String responseBody = response.body().string();
        // 在这里处理响应
    }
}