如何在Android Studio (Java)中获取调用请求的方法的服务器响应

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

public class MyNetworkUtils {
    public static String sendGetRequest(String url) throws IOException {
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url(url)
                .build();
        Response response = client.newCall(request).execute();
        return response.body().string();
    }
}

import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private Button btnSendRequest;
    private TextView tvResponse;

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

        btnSendRequest = findViewById(R.id.btn_send_request);
        tvResponse = findViewById(R.id.tv_response);

        btnSendRequest.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new NetworkTask().execute();
            }
        });
    }

    private class NetworkTask extends AsyncTask<Void, Void, String> {
        @Override
        protected String doInBackground(Void... voids) {
            try {
                return MyNetworkUtils.sendGetRequest("http://example.com/api");
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
        }

        @Override
        protected void onPostExecute(String response) {
            if (response != null) {
                tvResponse.setText(response);
            } else {
                tvResponse.setText("Error occurred");
            }
        }
    }
}