Android List 分组显示时的算法

    如下要根据时间来区分组别,来展示list数据,如下算法,可以实现:

/** * 从服务器读取保存的经济数据 *  * @return * @author qiulinhe * @createTime 2016年6月7日 下午3:12:49 */private ArrayList<Category> getData() {ArrayList<Category> listData = new ArrayList<Category>();Category categoryItem;result = TradeAPI.getInstance().queryEconomicDatas();if (result.isSucceed()) {ecoDatas = result.getDataList();}//以日期进行分组for (Iterator it = ecoDatas.iterator(); it.hasNext();) {EconomicData ecodata = (EconomicData) it.next();if (mapGroup.containsKey(ecodata.getDate())) { //如果已经存在这个数组，就放在这里  List ecoDatasGroup = mapGroup.get(ecodata.getDate());ecoDatasGroup.add(ecodata);mapGroup.put(ecodata.getDate(), ecoDatasGroup);} else {List ecoDatasGroup = new ArrayList(); //重新声明一个数组list  ecoDatasGroup.add(ecodata);mapGroup.put(ecodata.getDate(), ecoDatasGroup);}}//对分组的数据进行封装for (String key : mapGroup.keySet()) {List<EconomicData> ecodatagroup = mapGroup.get(key);categoryItem = new Category(key);for (EconomicData ecodata : ecodatagroup) {categoryItem.addItem(ecodata);}listData.add(categoryItem);}return listData;}