android 项目学习随笔五(JSON解析)

1、利用Xutils获取网络数据

/**
* 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();
}
});
}

 

2、利用gson解析JSON https://github.com/google/gson

创建自定义类(解析JSON返回)

 根据JSON的数据结构创建类

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

/**
     * 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);
    }

 

posted @ 2016-11-07 15:06  ecollab  阅读(222)  评论(0编辑  收藏  举报