Button exitButton = (Button) findViewById(R.id.button_exit); exitButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setMessage("정말로 종료하시겠습니까?"); builder.setCancelable(false); builder.setPositiveButton("YES", new DialogInterface.OnClickListener() { @Override public void on..