MYService myService = new MYService();
myService.getDialog();

public void showMsg(){
        AlertDialog alertDialog = new AlertDialog.Builder(getApplication())
                .setTitle("Success!")
                .setMessage("Countdown")
                .setPositiveButton("Success", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                }).create();

        alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
        alertDialog.show();
    }