force close my application when wifi "on" but internet not exist

Question

I wrote this code for checking INTERNET and it works but i have a problem that when wifi is on but internet does not exist!! in this situation my program force closed.

       private class NetCheck extends AsyncTask<String,String,Boolean>
       {

           @Override
           protected Boolean doInBackground(String... args){

               ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
               NetworkInfo netInfo = cm.getActiveNetworkInfo();
               if (netInfo != null && netInfo.isConnected()) {
                   try {
                       URL url = new URL("http://www.google.com");
                       HttpURLConnection urlc = (HttpURLConnection) url.openConnection();
                       urlc.setConnectTimeout(1000);
                       urlc.connect();
                       if (urlc.getResponseCode() == 200) {
                           return true;
                       }
                   } catch (MalformedURLException e1) {
                       // TODO Auto-generated catch block
                       e1.printStackTrace();
                   } catch (IOException e) {
                       // TODO Auto-generated catch block
                       e.printStackTrace();
                   }
               }
               return false;

           }

when internet connected or disconnected its work but when wifi on and internet not exist its not work an application force close!

@Override
           protected void onPostExecute(Boolean th){

               if(th == true){


                   getcountHA();


               }
               else{

                   ShowAlertDialog();
               }
           }
       }

whats problem!!

its my logcat

Well you might want to ping an actual URL to check connectivity, a connected WiFi does not always mean you are connected to the internet. — Skynet, Jan 18 '16 at 11:10

score 1 · Answer 1 · edited May 23 '17 at 10:29

Check with this method:

public boolean isInternetAvailable() {
        try {
            InetAddress ipAddr = InetAddress.getByName("google.com"); //You can replace it with your name

            if (ipAddr.equals("")) {
                return false;
            } else {
                return true;
            }

        } catch (Exception e) {
            return false;
        }

    }

Credits

score -1 · Answer 2 · answered Jan 19 '16 at 23:41

-1

my codes for check INTERNET are true and work great and the force close is because of another place. when INTERNET are not available the server give me some String codes like (

answered Jan 19 '16 at 23:41

M.Wandadi

1
2

force close my application when wifi "on" but internet not exist

2 Answers2