Internet Connection Check in Android

ConnectivityManager mgr = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfo netInfo = mgr.getActiveNetworkInfo();

if (netInfo != null) {

      if (netInfo.isConnected()) {

              // do something

      } else {

            AlertDialog.Builder alertbuilder = new AlertDialog.Builder(MyActivity.this);

            alertbuilder.setTitle("Internet");

            alertbuilder.setMessage("Internet is not available");

            alertbuilder.setNeutralButton("Ok", okClickListener);

           alertbuilder.show();

     }

} else {

      AlertDialog.Builder alertbuilder = new AlertDialog.Builder(

      MyActivity.this);

      alertbuilder.setTitle("Internet");

      alertbuilder.setMessage("Internet is not available");

      alertbuilder.setNeutralButton("Ok", okClickListener);

      alertbuilder.show();

}