Develop Reference

Genymotion unable to connect to server?

I have an app that sends a http request to a server and receives a JSON for processing. I test it on both a physical device and Genymotion.
The app runs fine on the physical device but on Genymotion throws NetworkOnMainThreadException.
I tracked the exception and this is the part with the issue:
..
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params,"UTF-8"));
// Exception on this line:
HttpResponse httpResponse = httpClient.execute(httpPost);
//
HttpEntity httpEntity = httpResponse.getEntity();
...
It seems that the Genymotion can't connect to server to execute the request. But its browser loads the sites just fine.
So, anyone knows what's going wrong here?

I found what the problem was:
As explained in this answer, since API 11, the NetworkOnMainThreadException is thrown to inform using long-running tasks (like http communications) in the main thread.
By using AsyncTask the problem was resolved and everything worked as it should.

Android: HttpClient remote vs. local server

I'm having problems with an app that works when connecting to a remote web server, running a php script against a database. However, when I point the same app to my local web server running on my machine, things doesn't work.
Here's the code I use for connecting to the remote web server (it needs authentication):
(All the networking code is done inside an AsyncTask class.)
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
StringBuilder authentication = new
StringBuilder().append("frankh").append(":").append("vriceI29");
result = Base64.encodeBytes(authentication.toString().getBytes());
httppost.setHeader("Authorization", "Basic " + result);
nameValuePairs.add(new BasicNameValuePair("date", date));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
For the connection to the local server, which doesn't use authentication, I'm commenting out these lines:
//StringBuilder authentication = new
// StringBuilder().append("frankh").append(":").append("vriceI29");
//result = Base64.encodeBytes(authentication.toString().getBytes());
//httppost.setHeader("Authorization", "Basic " + result);
However, I get two different errors, depending on how I phrase the url to the local web server.
If I use this url: "http://localhost.shoppinglistapp/fetchlist.php"
I get this error:
Error in http connectionjava.net.UnknownHostException: localhost.shoppinglistapp
If I skip the http part in the url, I get this error:
Error in http connectionjava.lang.IllegalStateException: Target host must not be null,
or set in parameters.
What am I doing wrong here? The remote server is a Linux Apache server, and the local server is IIS 7. The local server is supposed to be just for working on when I've got no or a bad internet connection, so it's not critical, but I hate not knowing why things doesn't work.

If you testing via your local emulator, you'll want to use 10.0.2.2 instead of 'localhost'.
Referring to localhost from the emulated environment

using http to invoke my apache webservice on android

I'm working on an android application which allows users to create accounts on a database via my tomcat webservice. I've tested the webservice with a browser and it works fine. So I've tried to use make Http requests to that URL with my andriod app but it doesn't work.
Here is my code
try{
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet();
URI webservice = new URI("http://my-machine-ip:8080/Login/login?username=jimmy&password=javajava");
request.setURI(webservice);
HttpResponse response = client.execute(request);
}catch (Exception e1) {
e1.printStackTrace();
}
I have also set the internet permission. <uses-permission android:name="android.permission.INTERNET" />
Checking my log I have a connection error
05-31 17:46:50.299: W/System.err(17395): org.apache.http.conn.ConnectTimeoutException: Connect to /192.168.0.3:8080 timed out
enter code here

Apparently, this was a connection problem caused my my firewall. A quick reconfiguration of applications with access on the firewall has solved everything

use your response object to get getEntity().getStatusLine() then get getStatusCode() and getReasonPhrase().
Check that the status is 200 and the reason is OK.

Authentication Error when using HttpPost with DefaultHttpClient on Android

I'm running into a strange problem using HttpClient. I am using a DefaultHttpClient() with HttpPost. I was using HttpGet with 100% success but now trying to switch to HttpPost as the REST API I'm using wants POST parameters rather than GET. (Only for some API calls though so I know that the GET calls were working fine so it's not a fault of the API).
Also, I tried using HttpPost on a simple php script I wrote that looks for a POST parameter 'var' and echoes it to screen, passing this parameters as follows worked fine:
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
postMethod = new HttpPost("http://www.examplewebsite.com");
nameValuePairs.add(new BasicNameValuePair("var", "lol"));
try {
postMethod.setEntity(new UrlEncodedFormEntity(nameValuePairs));
response = httpClient.execute(postMethod, responseHandler);
Log.i("RESTMethod", response);
...
The problem is that when I tried and do the same call to the API (but with the params changed to the API params obviously) I get the following error:
Authentication error: Unable to respond to any of these challenges: {}
The page I am requesting is an HTTPS page, could this be the problem?
But doing the same type of POST request to a raw HTTP page on the API gives the same error, unless I comment out the StringEntity part and then it runs (but returns xml and I want to pass a parameter to request the data in JSON).
This seems like a really strange problem (the non-https part) but couldn't really find any help on this problem so sorry if the answer is out there.
Any ideas?
Thanks in advance,
Infinitifzz
EDIT: Okay I'm getting nowhere so I thought if I directed you to the API it might shed some light, it's the 8Tracks API and as you can see you need to pass a dev key (api_key) for all requests and I the part I'm stuck on is using https to log a user in with: http://www.8tracks.com/sessions.xml" part.
Hope this helps somehow because I am at a dead end.
Thanks,
Infinitifizz

Authentication error: Unable to
respond to any of these challenges: {}
This error message means that the server responded with 401 (Unauthorized) status code but failed to provide a single auth challenge (WWW-Authenticate header) thus making it impossible for HttpClient to automatically recover from the authentication failure.
Most likely application expects some soft of credentials in the HTML form enclosed in the HTTP POST request.

Don't you have to declare the port and protocol? I'm just swagging this code so please don't be upset if it doesn't immediatley compile correctly. Also, I usually supply a UsernamePasswordCredentials to my setCredentials() but I imagine it's the same.
HttpHost host = new HttpHost("www.foo.com", 443, "https");
// assemble your GET or POST
client.getCredentialsProvider().setCredentials(new AuthScope(host.getHostName(), host.getPort()));
HttpResponse response = client.execute(host, [HttpPost or HttpGet]);
More info about setCredentials here.

Here's how I ended up with similar problem:
DefaultHttpClient client = new DefaultHttpClient();
client.getCredentialsProvider().setCredentials(AuthScope.ANY,
new UsernamePasswordCredentials(username, password));
Thanks to Ryan for right direction.

Not specifying a Callback URL for my Twitter App resulted in the same error for me:
Authentication error: Unable to respond to any of these challenges: {oauth=WWW-Authenticate: OAuth realm="https://api.twitter.com"}
Setting a callback URL on Twitter fixed the problem

Why am I Not able to send http request over WIFI to a machine on the local network from my android device

I am on WIFI and my Android device is connected.
In the android device I open a browser and go to http://192.168.1.12 - This is the IP address of the machine/server on the local network. I get the home page from this machine into my browser on the android device (because there is web server installed and it is a server machine).
Through my Java program - HttpPost is working very well for external sites like http://www.yahoo.com through WIFI - but it is NOT working for a server on the LAN
HttpClient hc = new DefaultHttpClient();
HttpPost post = new HttpPost("http://192.168.0.12/");
HttpResponse rp = hc.execute(post);
The above code DOES NOT work and http response status 404. But if I change the above url to say "http://www.yahoo.com" it works and response status is 200
Can anyone help please

The machine's IP is 192.168.1.12, but you're using HttpPost with 192.168.0.12.