Android : How do check the internet connection in android?

I am trying check internet state normally. When I enable internet and then I run this app it will show "Internet is connected". When I stop internet and then again run this app it again it will show "not connected to internet". But when I run this app in an emulator it always shows Internet connected. Please tell me what's the problem.

//check Internet conenction.
           private boolean checkInternetConenction(){
              ConnectivityManager check = (ConnectivityManager) this.context.
              getSystemService(Context.CONNECTIVITY_SERVICE);
              if (check != null) 
              {
                 NetworkInfo[] info = check.getAllNetworkInfo();
                 if (info != null)  
                    for (int i = 0; i <info.length; i++) 
                    if (info[i].getState() == NetworkInfo.State.CONNECTED)
                    {
                       Toast.makeText(context, "Internet is connected",
                       Toast.LENGTH_SHORT).show();

                    }
                 return true;
              } 
              else{
                 Toast.makeText(context, "not conencted to internet",
                 Toast.LENGTH_SHORT).show();
                 return false;
                  }

           }