[Android] AlertDialog 생성

public void onButton1Clicked(View v) { // 버튼 클릭 시
    AlertDialog.Builder builder = new AlertDialog.Builder(this);

    builder.setTitle("안내");
    builder.setMessage("종료하시겠습니까?");
    builder.setIcon(android.R.drawable.ic_dialog_alert);

    builder.setPositiveButton("예", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(getApplicationContext(), "예 버튼이 눌렸습니다.", Toast.LENGTH_LONG).show();
        }
    });
    AlertDialog dialog = builder.create();
    dialog.show();
}