Ho un problema con questo codice non riesco a stampare la risposta non capisco perchè? ho per forza bisogno di un thread? se si perchè? l' url in questione è delle api dell' università per effettuare il login e i due parametri che gli passo sono user e passw ma non mi stampa nulla con il log.

codice:
import java.io.IOException;


import java.io.UnsupportedEncodingException;

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

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;


import android.app.Activity;


import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;



public class Login extends Activity {

    public String RispostaLogin;
    public String response,responseBody;


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

        Button pulsante = (Button) findViewById(R.id.button2);
        pulsante.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                Log.d("myapp", "cliccato");
                sendPostRequest();


            }
        });


    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_login, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

   public void sendPostRequest()
   {


       HttpClient httpclient = new DefaultHttpClient();
       HttpPost httppost = new HttpPost("https://api.uniparthenope.it/user/radius/auth");

       try {
           // Add your data
           List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
           nameValuePairs.add(new BasicNameValuePair("user", "user"));
           nameValuePairs.add(new BasicNameValuePair("passw", "pass"));
           httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

           // Execute HTTP Post Request
           HttpResponse response = httpclient.execute(httppost);

           responseBody=EntityUtils.toString(response.getEntity());


            Log.d("myapp", responseBody);



       } catch (ClientProtocolException e1) {
           e1.printStackTrace();
       } catch (UnsupportedEncodingException e1) {
           e1.printStackTrace();
       } catch (IOException e1) {
           e1.printStackTrace();
       }



   }
}