4.json解析

{"name":"zhangsan", "age":18, "books":[{"name":"金瓶","price":10}, {"name":"红楼梦","price":20}]}

    public int retcode;
	public PhotosInfo data;
	public class PhotosInfo {
		public String title;
		public ArrayList<PhotoInfo> news;
	}

/**
 * 网络分类信息的封装
 * 
 * 字段名字必须和服务器返回的字段名一致, 方便gson解析
 */
public class NewsData {
	public int retcode;
	public ArrayList<NewsMenuData> data;
	// 侧边栏数据对象
	public class NewsMenuData {
		public String id;
		public String title;
		public int type;
		public String url;
		public ArrayList<NewsTabData> children;
		@Override
		public String toString() {
			return "NewsMenuData [title=" + title + ", children=" + children
					+ "]";
		}
	}
	// 新闻页面下11个子页签的数据对象
	public class NewsTabData {
		public String id;
		public String title;
		public int type;
		public String url;
		@Override
		public String toString() {
			return "NewsTabData [title=" + title + "]";
		}
	}
	@Override
	public String toString() {
		return "NewsData [data=" + data + "]";
	}
}

public class GlobalContants {
	public static final String SERVER_URL = "http://10.0.2.2:8080/zhbj";
   // 获取分类信息的接口
	public static final String CATEGORIES_URL = SERVER_URL + "/categories.json";
}

public class NewsCenterPager extends BasePager {
//只要需要往一个容器添加很多页面，就需要一个arraylist
	private ArrayList<BaseMenuDetailPager> mPagers;// 4个菜单详情页的集合
	private NewsData mNewsData;
	public NewsCenterPager(Activity activity) {
		super(activity);
	}
	@Override
	public void initData() {
		System.out.println("初始化新闻中心数据....");
		tvTitle.setText("新闻");
		setSlidingMenuEnable(true);// 打开侧边栏
		getDataFromServer();
	}
	/**
	 * 从服务器获取数据
	 */
	private void getDataFromServer() {
		HttpUtils utils = new HttpUtils();
		// 使用xutils发送请求
		utils.send(HttpMethod.GET, GlobalContants.CATEGORIES_URL,
				new RequestCallBack<String>() {
					// 访问成功
					@Override
					public void onSuccess(ResponseInfo responseInfo) {
						String result = (String) responseInfo.result;
						System.out.println("返回结果:" + result);
						parseData(result);
					}
					// 访问失败
					@Override
					public void onFailure(HttpException error, String msg) {
						Toast.makeText(mActivity, msg, Toast.LENGTH_SHORT)
								.show();
						error.printStackTrace();
					}
				});
	}
	/**
	 * 解析网络数据
	 * 
	 * @param result
	 */
	protected void parseData(String result) {
		Gson gson = new Gson();
		mNewsData = gson.fromJson(result, NewsData.class);
		System.out.println("解析结果:" + mNewsData);
		// 刷新测边栏的数据
		MainActivity mainUi = (MainActivity) mActivity;
		LeftMenuFragment leftMenuFragment = mainUi.getLeftMenuFragment()；//获取侧边栏对象
		leftMenuFragment.setMenuData(mNewsData);//侧边的方法，使用侧边栏展示数据
		// 准备4个菜单详情页
		mPagers = new ArrayList<BaseMenuDetailPager>();
		mPagers.add(new NewsMenuDetailPager(mActivity,
				mNewsData.data.get(0).children));
		mPagers.add(new TopicMenuDetailPager(mActivity));
		mPagers.add(new PhotoMenuDetailPager(mActivity));
		mPagers.add(new InteractMenuDetailPager(mActivity));
		setCurrentMenuDetailPager(0);// 设置菜单详情页-新闻为默认当前页
	}
	/**
	 * 设置当前菜单详情页
	 */
	public void setCurrentMenuDetailPager(int position) {
		BaseMenuDetailPager pager = mPagers.get(position);// 获取当前要显示的菜单详情页
		flContent.removeAllViews();// 清除之前的布局
		flContent.addView(pager.mRootView);// 将菜单详情页的布局设置给帧布局
		// 设置当前页的标题
		NewsMenuData menuData = mNewsData.data.get(position);//获取mNewsData下数据的第几个页面
		tvTitle.setText(menuData.title);
		pager.initData();// 初始化当前页面的数据
	}
}

public abstract class BaseMenuDetailPager {
	public Activity mActivity;
	public View mRootView;// 根布局对象
	public BaseMenuDetailPager(Activity activity) {
		mActivity = activity;
		mRootView = initViews();
	}
	/**
	 * 初始化界面
	 */
	public abstract View initViews();
	/**
	 * 初始化数据
	 */
	public void initData() {
	}
}