how to use restful service calls in android ?

public static String doPost(Context ctx, String mUrl,
List<NameValuePair> nameValuePairs, String username, String password) {

HttpParams httpParameters = new BasicHttpParams();

int timeoutConnection = 20000;

HttpConnectionParams.setConnectionTimeout(httpParameters,
timeoutConnection);
int timeoutSocket = 20000;

HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
DefaultHttpClient httpclient = new DefaultHttpClient(httpParameters);

String response_data = null;

HttpResponse response = null;

if (username != null && password != null) {

httpclient.getCredentialsProvider().setCredentials(
new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT),




new UsernamePasswordCredentials(username, password));

}

HttpPost postMethod = new HttpPost(mUrl);

try {
postMethod.setEntity(new UrlEncodedFormEntity(nameValuePairs));

response = httpclient.execute(postMethod);

response_data = EntityUtils.toString(response.getEntity());
} catch (Exception e) {

}

return response_data;

}

}