android 项目学习随笔五（JSON解析）

/**
* 从服务器获取数据 需要权限: <uses-permission
* android:name="android.permission.INTERNET"/>
*/
private void getDataFromServer() {
HttpUtils utils = new HttpUtils();
utils.send(HttpMethod.GET, Constants.CATEGORIES_URL,
new RequestCallBack<String>() {@Override
public void onSuccess(ResponseInfo<String> responseInfo) {
// 请求成功
String result = responseInfo.result;// 获取json字符串
// System.out.println("result:" + result);
processResult(result);
// 写缓存
CacheUtils.setCache(Constants.CATEGORIES_URL, result,
mActivity);
}@Override
public void onFailure(HttpException error, String msg) {
// 请求失败
error.printStackTrace();
Toast.makeText(mActivity, msg, Toast.LENGTH_SHORT)
.show();
}
});
}

import java.util.ArrayList;/**
* 新闻中心分类数据
*
* gson对象封装原则:
* 遇到{}就是一个对象
* 遇到[]就是一个Arraylist
* 对象中所有属性命名必须和服务器返回字段完全一致
*
*/
public class NewsMenuData { public int retcode;
public ArrayList<String> extend;
public ArrayList<NewsData> data; public class NewsData {
public String id;
public String title;
public int type;
public ArrayList<NewsTabData> children; @Override
public String toString() {
return "NewsData [title=" + title + ", children=" + children + "]";
}
} // 页签信息封装
public class NewsTabData {
public String id;
public String title;
public String url;
public int type; @Override
public String toString() {
return "NewsTabData [title=" + title + "]";
}
} @Override
public String toString() {
return "NewsMenuData [data=" + data + "]";
}
}

/**
* 解析json数据
*
* @param result
*/
protected void processResult(String result) {
// gson->json
Gson gson = new Gson();
mNewsMenuData = gson.fromJson(result, NewsMenuData.class);
System.out.println("解析结果:" + mNewsMenuData); // 获取侧边栏对象
MainActivity mainUI = (MainActivity) mActivity;
LeftMenuFragment leftMenuFragment = mainUI.getLeftMenuFragment();
// 将网络数据设置给侧边栏
leftMenuFragment.setData(mNewsMenuData.data); // 初始化4个菜单详情页
mMenuDetailPagers = new ArrayList<BaseMenuDetailPager>();
mMenuDetailPagers.add(new NewsMenuDetailPager(mActivity,
mNewsMenuData.data.get(0).children));
mMenuDetailPagers.add(new TopicMenuDetailPager(mActivity));
mMenuDetailPagers.add(new PhotosMenuDetailPager(mActivity));
mMenuDetailPagers.add(new InteractMenuDetailPager(mActivity)); // 菜单详情页-新闻作为初始页面
setCurrentMenuDetailPager(0);
}