android排序Collections.sort

private void sort(int mPos) { switch (mPos) { case 0: Collections.sort(mList, new Comparator<Frag02Bean>() { @Override public int compare(Frag02Bean a, Frag02Bean b) { //升序 return a.getId() - b.getId(); } }); break; case 1: Collections.sort(mList, new Comparator<Frag02Bean>() { @Override public int compare(Frag02Bean a, Frag02Bean b) { //降序 return b.getId() - a.getId(); } }); break; }