Question

In my application I need to check whether device is connected to Internet. I tried using ConnectivityManager but it doesn’t give a 100% precise result. For instance, I might have a wi-fi connection but still don’t have access to internet resources. In my case I’ve got to open a VPN connection, after I’ve connected to via wi-fi, in order to get real access to Internet. So the approach with ConnectivityManager doesn’t work.

So, regarding the above – should I write a manual http request in order to ensure or there’s another way ?

Here’s some code I’m using

ConnectivityManager cm =  (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        return cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isConnected() && cm.getActiveNetworkInfo().isAvailable();

Answer 1

Instead of checking every time for internet connection, I think setting ConnectionTimeout to HTTPRequest its the best way.

try
  {

   HttpGet request = new HttpGet(url));
   HttpParams httpParameters = new BasicHttpParams();
   // Set the timeout in milliseconds until a connection is established.
   // The default value is zero, that means the timeout is not used. 
   int timeoutConnection = 60000;
   HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
   // Set the default socket timeout (SO_TIMEOUT) 
   // in milliseconds which is the timeout for waiting for data.
   int timeoutSocket = 60000;
   HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
   // create object of DefaultHttpClient    
   DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
   request.addHeader("Content-Type", "application/json");
   HttpResponse response = httpClient.execute(request);
   // get response entity
   HttpEntity entity = response.getEntity();
   // convert entity response to string

     if (entity != null)
      {
         result = EntityUtils.toString(entity);
      }

   }
 catch (SocketException e)
  {
     return "-222" + e.toString();
  }
 catch (Exception e)
  {
     return "-333" + e.toString();
  }