关于list的排序

 

@Override
	public int compare(Books firstBook, Books secondBook) {
		int ret = 0;
		switch (mKey) {
		case SORT_BY_RECENT_READ:
			ret = sortByRecentRead(firstBook, secondBook);
			break;
		case SORT_BY_DOWNLOAD:
			ret = sortByDownload(firstBook, secondBook);
			break;
		case SORT_BY_RECENT_BUY:
			ret = sortByRecentBuy(firstBook, secondBook);
			break;
		case SORT_BY_NAME:
			ret = sortByName(firstBook, secondBook);
			break;
		case SORT_BY_AUTHORS:
			ret = sortByAuthors(firstBook, secondBook);
			break;
		case SORT_BY_PUBLISHER:
			ret = sortByPublisher(firstBook, secondBook);
			break;
		default:
			ret = 0;
			break;
		}
		return ret;
	}

 

 

	
 ArrayList<Books> mList = new ArrrayList<Books> ();
Collections.sort(mList, new CompareBooks(mList,
				CompareBooks.SORT_BY_RECENT_BUY));

 

 

 

   负责排序实现的类，Comparator  ，部分代码