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public boolean onKeyDown(int keyCode, KeyEvent event){

        switch(keyCode){

            case KeyEvent.KEYCODE_BACK:

                String alertTitle = "Auto Scheduler";

                String buttonMessage = "어플을 종료하시겠습니까?";

                String buttonYes = "Yes";

                String buttonNo = "No";

 

                new AlertDialog.Builder(majSelectActivity.this)

                        .setTitle(alertTitle)

                        .setMessage(buttonMessage)

                        .setPositiveButton(buttonYes, new DialogInterface.OnClickListener() {

 

                            @Override

                            public void onClick(DialogInterface dialog, int which) {

                                // TODO Auto-generated method stub

                                moveTaskToBack(true);

                                finish();

                            }

                        })

                        .setNegativeButton(buttonNo, null)

                        .show();

        }

        return true;

 

    }

출처: http://twinw.tistory.com/33 [흰고래의꿈]