HttpGet in android, UnresolvedHostException

Question

Hello, I'm quite new to android and try to implement http client to communicate to a REST server. I'm starting with the Get method but I have some problems using android 2.0 on the emulator.

String url = "http://www.google.fr/search?q=android"
HttpClient client = new DefaultHttpClient(new BasicHttpParams());
HttpGet getMethod = new HttpGet((url));
HttpResponse httpResponse = client.execute(getMethod);
HttpEntity = httpResponse.getEntity());
int length = (int) httpEntity.getContentLength();
=> length is -1 :-(

A look into the logs gives me the UnresolvedHostException.

I searched on google and found several guys having the same problem but who didn't find any answer. Is there a particuliar way to configure the android emulator to have this working ? Just to precise, I have added the Internet access in the android manifest.

Thanks a lot for your help. Luc

Answer 1

First, try accessing that page from the Browser application. If that fails, check your firewall or deactivate your proxy server.

Once the Browser can access the page, try getting rid of the new BasicHttpParams() (it is not needed) and see if that helps. Otherwise, what you have seems OK.

Answer 2

If you are sitting behind a proxy, you can alternatively set Proxy IP/port in your DefaultHttpClient instance. The method to do this would look something like:

public void setProxy(DefaultHttpClient httpclient) {     
           final String PROXY_IP = "<insert your IP here>";     
            final int PROXY_PORT = <insert_PROXY_PORT#>;     

            httpclient.getCredentialsProvider().setCredentials(     
                    new AuthScope(PROXY_IP, PROXY_PORT),     
                    new UsernamePasswordCredentials(     
                            "username", "password"));     

           HttpHost proxy = new HttpHost(PROXY_IP, PROXY_PORT);     

           httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,     
                   proxy);     


       }

However, note that if you are running your code on the phone(which wont have any such proxy settings) you will have to disable this function;
On phone, your existing code should work just fine.

Answer 3

Try URL without any GET-Parameter (?q=android).

String url = "http://www.google.fr/search";

I think the URLParams have to be set in another way?