市级人防信息化管理系统JSON解析方面

      final TaskResult[] ret = {TaskResult.FAILED};
AQuery aq = new AQuery(DownLoadAnnouncement.this);

// 定义的关于请求通知公告的参数，PC端（市级）默认为0
HashMap<String, Object> param = new HashMap<String, Object>();
param.put("latestAnnouncementId", 0);

aq.ajax(Configuration.getDownloadAnnouncementURL(),param,JSONObject.class,newAjaxCallback<JSONObject>() {
@Override
public void callback(String url, JSONObject object,AjaxStatus status) {
if (status.getCode() != 200) {
// 正常情况下HTTP返回200代表请求到资源，不等于200表示连接错误
Toast.makeText(DownLoadAnnouncement.this,R.string.login_status_network_or_connection_error, Toast.LENGTH_SHORT).show();
ret[0] = TaskResult.FAILED;
return;
}
try 
{
DownLoadAnnouncementJson msg = new DownLoadAnnouncementJson(object);
if (msg.getCode() == 1)
{
try {

JSONArray jsonObjs = msg.getJsonArray(); 

//获取JsonArray数组的每一项

for(int i = 0; i < jsonObjs.length() ; i++){
JSONObject jsonObj = ((JSONObject)jsonObjs.opt(i));
announcementId = jsonObj.getInt("announcementId"); 
announcementTitle = jsonObj.getString("announcementTitle");
HashMap<String, Object> map = new HashMap<String, Object>();  
 map.put("ItemTitle", announcementId);  
 map.put("ItemText", announcementTitle); 
 listItem.add(map); 
} 
            

}

catch (JSONException e) 

{ 

System.out.println("Jsons parse error !"); 
e.printStackTrace(); 
 } 
ret[0] = TaskResult.OK;
} 
else if (msg.getCode() == 0)
{
ret[0] = TaskResult.FAILED;
Toast.makeText(DownLoadAnnouncement.this, R.string.request_fail, Toast.LENGTH_SHORT).show();
}
} 
//我自己的异常1111111111111111111111111
catch (DownLoadAnnouncementException e) 
{
ret[0] = TaskResult.FAILED;
Toast.makeText(DownLoadAnnouncement.this, R.string.request_fail, Toast.LENGTH_SHORT).show();
}
}

});

1.Configuration.getDownloadAnnouncementURL()

defaultProperty.setProperty("DownloadAnnouncement","DownloadAnnouncement");

public static String getDownloadAnnouncementURL() {
return getBaseURL() +getProperty("DownloadAnnouncement");
}

public static StringgetProperty(String name) {
return getProperty(name, null);
}

public static StringgetBaseURL() {
String url = AppContext.getServerAddress();
if (TextUtils.isEmpty(url)) {
return null;
}
if (url.startsWith("http://")) {
return url;
}
return "http://" + url;
}

public static StringgetServerAddress() {
return PreferenceManager.getDefaultSharedPreferences(
AppContext.appContext).getString(SERVER_ADDRESS, "商定的接口地址");
}

2.param 和数据库那边的商定，本内容是获取公告，每次都从第一条获取，故0.

3.JSONObject object通过callback返回来的object。

4DownLoadAnnouncementJson JSON解析，解析出JSONArray

setCode(wrapper.getInt("code"));
setJsonArray(wrapper.getJSONArray("announcementArray"));

5.opt(i)获取JsonArray的第i项