A small client to send requests from android to your symfony apps (symfony's REST pattern compliant).

sfClient (singleton to store session) :

package org.me.sfBackendClient;
 
import org.apache.http.impl.client.DefaultHttpClient;
 
/**
 * symfony application client singleton
 * thanks to Cansin http://senior.ceng.metu.edu.tr/2009/praeda/2009/01/11/a-simple-restful-client-at-android/
 * @author jean-philippe serafin <jean-philippe.serafin@dev-solutions.fr>
 */
public class sfClient{
  private static sfClient instance;
  protected DefaultHttpClient httpClient;
  /**
   * constructor
   */
  private sfClient(){
    this.httpClient = new DefaultHttpClient();
  }
  /**
   * instance accessor
   */
  public static sfClient getInstance(){
    if(null == instance){
      instance = new sfClient();
    }
    return instance;
  }
  /**
   * creating new request
   */
  public sfRequest createRequest(){
    sfRequest request = new sfRequest(this.httpClient);
    return request;
  }
}

sfRequest :

package org.me.sfBackendClient;
//IO
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
//utils
import java.util.List;
import java.util.ArrayList;
//apache
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.impl.client.DefaultHttpClient;
 
/**
 * symfony request
 * thanks to Cansin http://senior.ceng.metu.edu.tr/2009/praeda/2009/01/11/a-simple-restful-client-at-android/
 * @author jean-philippe serafin <jean-philippe.serafin@dev-solutions.fr>
 */
public class sfRequest{
  protected String url;
  protected String method;
  protected List<NameValuePair> params;
  protected HttpGet getRequest;
  protected HttpPost postRequest;
  protected HttpResponse response;
  protected String result;
  protected DefaultHttpClient httpClient;
 
  /**
   * constructor
   */
  public sfRequest(DefaultHttpClient client){
    this.httpClient = client;
    this.params = new ArrayList<NameValuePair>(2);
  }
  public void setUrl(String url){
    this.url = url;
  }
  public String getUrl(){
    return this.url;
  }
  public void setMethod(String method){
    this.method = method;
  }
  public String getMethod(){
    return this.method;
  }
  /**
   * Adding parameter
   * @param key
   * @param value
   */
  public void addParam(String key, String value){
    this.params.add(new BasicNameValuePair(key, value));
  }
  /**
   * getting response text
   * @return String response
   */
  public String getResult(){
    return this.result;
  }
  /**
   * executing request
   */
  public void execute(){
    try {
        if(this.method.compareToIgnoreCase("GET") == 0){
        this.getRequest = new HttpGet(this.getUrl());
        this.response = this.httpClient.execute(this.getRequest);
      }else if(this.method.compareToIgnoreCase("POST") == 0
                || this.method.compareToIgnoreCase("PUT") == 0
                || this.method.compareToIgnoreCase("DELETE") == 0){
        this.addParam("sf_method", this.getMethod());
        this.postRequest = new HttpPost(this.getUrl());
        this.postRequest.setEntity(new UrlEncodedFormEntity(this.params));
        this.response = this.httpClient.execute(this.postRequest);
      }
      HttpEntity entity = response.getEntity();
      if(entity != null){
        InputStream inputStream = entity.getContent();
        this.result = convertStreamToString(inputStream);
      }
    } catch (ClientProtocolException e) {
        //e.printStackTrace();
        this.result = e.getMessage();
    } catch (IOException e) {
        this.result = e.getMessage();
    }
  }
  /**
   * converting stream reader to string
   * @return String
   */
  private static String convertStreamToString(InputStream is) {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder stringBuilder = new StringBuilder();
 
    String line = null;
    try {
      while ((line = reader.readLine()) != null) {
        stringBuilder.append(line + "\n");
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        is.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return stringBuilder.toString();
  }
}

Usage :

sfRequest request = sfClient.getInstance().createRequest();
request.setUrl("http://xxxxxxxxx/androidConnect/connect");
request.setMethod("POST");
request.addParam("login", loginField.getText().toString());
request.addParam("password", passwordField.getText().toString());
request.execute();
String message = request.getResult();

thanks to Cansin