Preference 쓰기.

참고 글: PreferenceActivity 사용하기

저장할때:
SharedPreferences myPref = getSharedPreferences("some_name", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = myPref.edit();
               
editor.putInt("lastThemePosition", m_Fgallery.getSelectedItemPosition());
editor.commit();

읽을때:
SharedPreferences settings = getSharedPreferences("some_name", Activity.MODE_PRIVATE);
int lastThemePosition = settings.getInt("lastThemePosition", 0);