private void connectionControl() {
        if(isNetworkStatusAvialable (getApplicationContext())) {
            //
        }
        else
        {
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setTitle("SShop");
            builder.setMessage("İnternet bağlantınız bulunmamaktadır.");
            builder.setCancelable(false);
            builder.setPositiveButton("Kapat", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    finish();
                    System.exit(0);
                }
            });
            builder.show();

        }
    }

    public static boolean isNetworkStatusAvialable (Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivityManager != null)
        {
            NetworkInfo netInfos = connectivityManager.getActiveNetworkInfo();
            if(netInfos != null)
                if(netInfos.isConnected())
                    return true;
        }
        return false;
    }