public class AlarmPopup extends Activity {

    private PopupWindow popup;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        onShowPopup();

    }

    public void onShowPopup(){

        LayoutInflater inflater = (LayoutInflater)     getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        final View view = inflater.inflate(R.layout.alarm_popup, null, false);

        popup = new PopupWindow(view, 400, 300, true);

        setContentView(R.layout.alarm_popup);

        view.findViewById(R.id.button).post(new Runnable() {

            @Override

            public void run() {

                popup.showAtLocation(view, Gravity.CENTER, 0, 0);

            }

        });

        findViewById(R.id.button).setOnClickListener(mClickListener);

    }

    Button.OnClickListener mClickListener = new View.OnClickListener() {

        @Override

        public void onClick(View view) { // 팝업 끄면서 타 class에 있는 알람 function을 종료시킵니다.

            Intent i = new Intent(AlarmPopup.this, AlarmService.class);

            stopService(i); // 기묘하게 이건 또 먹힙니다;;

            popup.dismiss();

        }

    };

}