Android开发日记（五）

从服务器端传递多个数据

先在服务器端设置cs文件

 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.Mvc;

 namespace WebJSON.Controllers
 {
     public class adShowTitleController : Controller
     {
         DataInfo storedb = new DataInfo();
         //
         // GET: /JobDetails/

         public JArray Index(int adid = int.MaxValue)
         {

             IEnumerable<ad> ads;
             ads = storedb.ad.Where(u => u.adid < adid).OrderByDescending(u => u.adid).Take();
             string json = JsonConvert.SerializeObject(ads);
             return JArray.Parse(json);
         }

     }
 }

传递所有id小于所设置的最大值的json数组对象

然后在java客户端调用service方法取回这些json对象

在调用listItem方法用一个for循环设置所有listItem每层循环后加listItem.add(map);再生成一个新的listItem

listItem定义：ArrayList<HashMap<String, Object>> listItem;
                   SimpleAdapter listItemAdapter;

 listItem = new ArrayList<HashMap<String, Object>>();
     for (int i = 0; i < addetailsJsonArray.length(); i++) {
         JSONObject lectureJsonObject = addetailsJsonArray.optJSONObject(i);
         HashMap<String, Object> map = new HashMap<String, Object>();
         map.put("lectureid", lectureJsonObject.optInt("adid"));
         map.put("lecturetitle",lectureJsonObject.optString("adtitle").trim());
         map.put("reporter", lectureJsonObject.optString("adman").trim());
         map.put("lecturetime",lectureJsonObject.optString("addate").replace("T"," ").trim());
                         //.replace("T", " ").substring(0, 19));
         //map.put("lecturesite", lectureJsonObject.optString("lecturesite").trim());
         //map.put("campus",lectureJsonObject.optString("campus").trim());
         //map.put("remark",lectureJsonObject.optString("remark").trim());
         //map.put("depart", lectureJsonObject.optString("depart").trim());
         //map.put("starttime", lectureJsonObject.optString("starttime").trim());
         //lastLectureid=lectureJsonObject.optInt("id");
         listItem.add(map);
         // TODO Auto-generated method stub
         listItemAdapter = new SimpleAdapter(this, listItem,// 数据源
                 R.layout.leturetitle_listview,// ListItem的XML实现
                         // 动态数组与ImageItem对应的子项
                 new String[] { "lectureid", "lecturetitle",
                         "reporter", "lecturetime"},
                 // ImageItem的XML文件里面的一个ImageView,两个TextView ID
                 new int[] { R.id.textView_lectureid,
                         R.id.textView_lecturetitle, R.id.textView_report,
                         R.id.textView_lecturetime });
         listViewNewsMoreTitles.setAdapter(listItemAdapter);