如何从Android Studio项目调用web服务

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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class WebServiceHandler {
    public String callWebService(String url) {
        StringBuilder response = new StringBuilder();
        try {
            URL webServiceUrl = new URL(url);
            HttpURLConnection connection = (HttpURLConnection) webServiceUrl.openConnection();
            connection.setRequestMethod("GET");

            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return response.toString();
    }
}

WebServiceHandler webServiceHandler = new WebServiceHandler();
String webServiceUrl = "http://example.com/api/data";
String response = webServiceHandler.callWebService(webServiceUrl);