public boolean isNetworkAvailable() {
        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        if ((activeNetworkInfo != null) && (activeNetworkInfo.isConnected())) {
            return true;
        } else {
            Toast.makeText(context,"İnternet Yok",Toast.LENGTH_SHORT).show();
            return false;
        }
    }