CODEWITHSUNDEEP
android
user1462299
user1462299

Reputation: 4287

Check real internet connection

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();

Upvotes: 3

Views: 1980

Answers (5)

user370305
user370305

Reputation: 109257

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();
  }

Upvotes: 2

user1587609
user1587609

Reputation:

try this 

private void MyCheckinternet() {
        // TODO Auto-generated method stub
        ConnectivityManager connectivityManager = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
            if(connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED || 
                    connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED) {
                //we are connected to a network
                connected = true;
            }
            else
            {
                connected = false;
    }
}

Upvotes: 0

Ponmalar
Ponmalar

Reputation: 7031

Try with this,

NetworkInfo ActiveNetwork;
String Isconnected="";
ConnectivityManager connectivitymanager;
connectivitymanager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
Connection con=new Connection();
try
{           
    ActiveNetwork=connectivitymanager.getActiveNetworkInfo();
    Isconnected="true";                 
}
catch(Exception error)
{
    IsConnected="false";
}

Upvotes: 0

vinothp
vinothp

Reputation: 10079

Try this,

     private boolean checkInternetConnection() {
     try {

            ConnectivityManager nInfo = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            nInfo.getActiveNetworkInfo().isConnectedOrConnecting(); 

            ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo netInfo = cm.getActiveNetworkInfo();
            if (netInfo != null && netInfo.isConnectedOrConnecting()) { 
                return true;
            } else { 
                return false; }

        } catch (Exception e) {
            return false;
        }
    }

It working perfectly for me...

Hope it helps

Upvotes: 0

dacwe
dacwe

Reputation: 43514

Yes, you are correct, to check that you can reach the internet you need to test that explicitly. If you need HTTP access you can try connecting to the host you later on want to connect to.

You should however use the connection method that you intend to use later on. HTTP can work but not FTP. So if you need FTP access you should test it.

If you also want to get the external IP you can use this method:

public static InetAddress getExternalIp() throws IOException {
    URL url = new URL("http://automation.whatismyip.com/n09230945.asp");
    URLConnection connection = url.openConnection();
    connection.addRequestProperty("Protocol", "Http/1.1");
    connection.addRequestProperty("Connection", "keep-alive");
    connection.addRequestProperty("Keep-Alive", "1000");
    connection.addRequestProperty("User-Agent", "Web-Agent");

    Scanner s = new Scanner(connection.getInputStream());
    try {
        return InetAddress.getByName(s.nextLine());
    } finally {
        s.close();
    }
}

If you successfully got an IP address back from this method, you can connect via HTTP to that.

Upvotes: 3

Related Questions