这里涉及到对ListView的数据进行排序,以及ListView的数据如何清空处理。排序的方法相同,但是里面的数据集合有些区别:一种是利用pojo类取得数据;另一种是利用map来取得数据。
第一种:利用pojo类完成排序
pojo类:HuoLiang.class
public class HuoLiang { private String dianmian;// 店面 private String total_price;// 运费 private String agent_cargo_charge;// 代收 private String shuliang;// 运单 private String quantity;// 件数 public String getDianmian() { return dianmian; } public void setDianmian(String dianmian) { this.dianmian = dianmian; } public String getTotal_price() { return total_price; } public void setTotal_price(String total_price) { this.total_price = total_price; } public String getAgent_cargo_charge() { return agent_cargo_charge; } public void setAgent_cargo_charge(String agent_cargo_charge) { this.agent_cargo_charge = agent_cargo_charge; } public String getShuliang() { return shuliang; } public void setShuliang(String shuliang) { this.shuliang = shuliang; } public String getQuantity() { return quantity; } public void setQuantity(String quantity) { this.quantity = quantity; } @Override public String toString() { return "HuoLiang [dianmian=" + dianmian + ", total_price=" + total_price + ", agent_cargo_charge=" + agent_cargo_charge + ", shuliang=" + shuliang + ", quantity=" + quantity + "]"; }
List<HuoLiang> internetlist= new ArrayList<HuoLiang>();//从服务器上加载的数据 // 将集合中的值赋给另一个集合,前提条件是两个集合的类型一致 List<HuoLiang> locallist = new ArrayList<HuoLiang>(internetlist); //listView的自定义的适配器,是本地数据集合locallist和ListView的桥梁 HLCheckAdapter localadapter= new HLCheckAdapter(locallist, R.layout.check_item,HLCheckActivity.this); //服务器加载的数据集合internetlist与listView的桥梁 HLCheckAdapter adapter= new HLCheckAdapter(internetlist, R.layout.check_item,HLCheckActivity.this); if (internetlist != null && internetlist.size() != 0) { //将本地数据集合清空,然后加载到适配器中,这样才能做到ListView的数据的清空,方便下面的排序 locallist.clear(); listView.setAdapter(localadapter);
//升序 Collections.sort(internetlist, new Comparator<HuoLiang>() { @Override public int compare(HuoLiang t1, HuoLiang t2) { // TODO Auto-generated method stub if (Float.parseFloat(t1.getTotal_price()) > Float .parseFloat(t2.getTotal_price())) { return 1; } if (Float.parseFloat(t1.getTotal_price()) < Float .parseFloat(t2.getTotal_price())) { return -1; } return 0; } }); // 将排序后的集合加载到listView中 listView.setAdapter(adapter); }
//降序 locallist.clear(); listView.setAdapter(localadapter); Collections.sort(internetlist, new Comparator<HuoLiang>() { @Override public int compare(HuoLiang t1, HuoLiang t2) { // TODO Auto-generated method stub if (Float.parseFloat(t1.getTotal_price())<Float.parseFloat(t2.getTotal_price())) { return 1; } if (Float.parseFloat(t1.getTotal_price())>Float.parseFloat(t2.getTotal_price())) { return -1; } return 0; } }); // 将排序后的集合加载到listView中 listView.setAdapter(adapter);
第二种:利用Map进行排序
// 清空listView列表 localList.clear(); listView.setAdapter(localadapter); // 排序 Collections.sort(listitem,new Comparator<Map<String, Object>>() { @Override public int compare(Map<String, Object> o1, Map<String, Object> o2) { if (Float.parseFloat(o1.get("agent_cargo_charge").toString()) > Float.parseFloat(o2.get("agent_cargo_charge").toString())) { return 1; } else if (Float.parseFloat(o1.get("agent_cargo_charge").toString()) < Float.parseFloat(o2.get("agent_cargo_charge").toString())) { return -1; } return 0; } }); // 将排序后的集合加载到listView中 listView.setAdapter(hlCheckAdapter);