對一個集合的數據進行分組

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看到數據如上我們需要做的是分成鎮數據包含村數據

//構造城鎮列表List<TownListEntity.RDataBean> towns = new ArrayList<>();for (TownListEntity.RDataBean town : response.body().getRData()) {//up_area_id為0的都為城鎮列表if (town.getUp_area_id().equals("0")) {towns.add(town);}}//遍歷上面得到的城鎮列表for (TownListEntity.RDataBean town : towns) {//構造鄉村列表List<TownListEntity.RDataBean.ChildsBean> child = new ArrayList<>();//遍歷得到的所有數據找出城鎮列表下級的所有孩子for (TownListEntity.RDataBean country : response.body().getRData()) {//如果up_area_id為0為城鎮不做處理繼續下一條if (country.getUp_area_id().equals("0")) {continue;}//如果鄉村的ID上一級所指為當前遍歷的城鎮 那么添加if (country.getUp_area_id().equals(town.getArea_id())) {child.add(new TownListEntity.RDataBean.ChildsBean(country.getArea_id(), country.getUp_area_id(),country.getArea_key(), country.getArea_name(), country.getArea_img()));}}//編列結束添加鄉村列表到當前的城鎮之下town.setChilds(child);}//設置城鎮列表數據townListEntity.setRData(towns);}

總結

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