종료 다이얼로그 [Android]

new AlertDialog.Builder(this).setTitle("질문").setMessage("종료 하시겠습니까?")
   .setPositiveButton("예", new DialogInterface.OnClickListener() {
    
    @Override
    public void onClick(DialogInterface dialog, int which) {
     System.exit(0);  
    }
   } ).setNegativeButton("아니요",new DialogInterface.OnClickListener() {
    
    @Override
    public void onClick(DialogInterface dialog, int which) {
    }
   })
   .show();

///////////////////////////////////////////////////////////////////////////////////////////

@Override

    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if(event.getKeyCode() == KeyEvent.KEYCODE_BACK){

             AlertDialog.Builder builder = new AlertDialog.Builder(this);

                builder.setMessage("종료 할까요 ? ")

                        .setCancelable(false)

                        .setPositiveButton("OK", new DialogInterface.OnClickListener() {

                           public void onClick(DialogInterface dialog, int id) {

                                   System.exit(0);

                           }

                       })

                       .setNegativeButton("No", new DialogInterface.OnClickListener() {

                           public void onClick(DialogInterface dialog, int id) {

                                dialog.cancel();

                           }

                       });

                AlertDialog alert = builder.create();

                alert.show();

        }

        return super.onKeyDown(keyCode, event);

    }

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