final AlertDialog ad = new AlertDialog.Builder(this).create();

ad.setTitle("Invalid User");
ad.setMessage("Sorry, this program is in closed beta and only accessible to a few users.");
ad.setCancelable(false);
ad.setButton("Close", new DialogInterface.OnClickListener() {

	public void onClick(DialogInterface dialog, int which) {
		ad.dismiss();
		finish();
	}
});

if(foreground)
    ad.show();