android studio中存放json文件，获取assets文件下下文件，获取本地json文件并解析

转自http://blog.csdn.net/yanxiaosa/article/details/70859927

以前看过这些知识，今天用到的时候，发现自己忘记了,都不知道assets文件夹在哪个目录下。百度了一下，assets目录和java目录是同一个级别的。 
我们右击assets目录新建File，起名”dynamic.json”,然后我们在文件中写一些json数据:

{"dynamic":[
  {
    "username":"燕潇洒",
    "createTime":"04-23 13:12",
    "commentNum":"45",
    "content":"喔喔喔",
    "headIcon":"http://img2.imgtn.bdimg.com/it/u=1576185143,2361770572&fm=214&gp=0.jpg",
    "images":"http://img4.imgtn.bdimg.com/it/u=3776739438,757564394&fm=214&gp=0.jpg",
    "level":"公告",
    "priseNum":"23"
  },
  {
    "username":"徐金杰",
    "createTime":"04-23 13:12",
    "commentNum":"45",
    "content":"哩哩里",
    "headIcon":"http://img4.duitang.com/uploads/item/201508/17/20150817142843_4smWc.jpeg",
    "images":"http://pic.58pic.com/58pic/13/70/90/29358PICQjG_1024.jpg",
    "level":"公告",
    "priseNum":"43"
  },{
    "username":"宋亮亮",
    "createTime":"04-23 13:12",
    "commentNum":"23",
    "content":"咕咕咕",
    "headIcon":"http://img2.imgtn.bdimg.com/it/u=1576185143,2361770572&fm=214&gp=0.jpg",
    "images":"http://img1.3lian.com/2015/w7/85/d/21.jpg",
    "level":"重要",
    "priseNum":"12"
  },
  {
    "username":"唐梦茹",
    "createTime":"04-23 13:12",
    "commentNum":"450",
    "content":"喵喵喵",
    "headIcon":"http://img4.duitang.com/uploads/item/201508/17/20150817142843_4smWc.jpeg",
    "images":"http://img4.imgtn.bdimg.com/it/u=3776739438,757564394&fm=214&gp=0.jpg",
    "level":"公告",
    "priseNum":"345"
  },{
    "username":"米述林",
    "createTime":"04-23 13:12",
    "commentNum":"333",
    "content":"咪咪咪",
    "headIcon":"http://www.haopic.me/wp-content/uploads/2015/12/2015122808171644.jpg",
    "images":"http://img1.3lian.com/2015/w7/85/d/21.jpg",
    "level":"重要",
    "priseNum":"323"
  },{
    "username":"冯大双",
    "createTime":"04-23 13:12",
    "commentNum":"322",
    "content":"么么哒",
    "headIcon":"http://img.bitscn.com/upimg/allimg/c160120/1453262U560940-A5c.jpg",
    "images":"http://img1.3lian.com/2015/w7/85/d/21.jpg",
    "level":"重要",
    "priseNum":"222"
  },{
    "username":"施伟",
    "createTime":"04-23 13:12",
    "commentNum":"12",
    "content":"啦啦啦",
    "headIcon":"http://www.haopic.me/wp-content/uploads/2015/12/2015122808171644.jpg",
    "images":"http://img1.hq2011.com/uploads/allimg/150131/0122205Y4-0.jpg",
    "level":"公告",
    "priseNum":"4"
  },{
    "username":"宋佳利",
    "createTime":"04-23 15:45",
    "commentNum":"23",
    "content":"呵呵呵",
    "headIcon":"http://scimg.jb51.net/allimg/170330/2-1F3301636200-L.jpg",
    "images":"http://img1.3lian.com/2015/w7/85/d/21.jpg",
    "level":"公告",
    "priseNum":"12"
  },{
    "username":"杨永刚",
    "createTime":"04-23 13:16",
    "commentNum":"12",
    "content":"嘻嘻嘻",
    "headIcon":"http://www.qqw21.com/article/UploadPic/2016-2/20162192155654059.jpg",
    "images":"http://img1.hq2011.com/uploads/allimg/150131/0122205Y4-0.jpg",
    "level":"公告",
    "priseNum":"1"
  },{
    "username":"程森然",
    "createTime":"04-22 14:12",
    "commentNum":"22",
    "content":"哈哈哈",
    "headIcon":"http://img2.imgtn.bdimg.com/it/u=1576185143,2361770572&fm=214&gp=0.jpg",
    "images":"http://pic.58pic.com/58pic/13/70/90/29358PICQjG_1024.jpg",
    "level":"重要",
    "priseNum":"23"
  }
]

}

那么，怎么读到这些数据呢?使用系统的方法:

public static String getJson(String fileName,Context context) {
    //将json数据变成字符串 
        StringBuilder stringBuilder = new StringBuilder();
        try {
        //获取assets资源管理器
            AssetManager assetManager = context.getAssets();
            //通过管理器打开文件并读取
            BufferedReader bf = new BufferedReader(new InputStreamReader(
                    assetManager.open(fileName)));
            String line;
            while ((line = bf.readLine()) != null) {
                stringBuilder.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return stringBuilder.toString();
    }

这个时候，如果我们要把字符串转换成Object的话:

JSONObject jsonObject = new JSONObject(str);

 

然后通过正常的转换，获取其中的JSONArray或者直接转成对象:

//将读出的字符串转换成JSONobject
 JSONObject jsonObject = new JSONObject(str);
 //获取JSONObject中的数组数据
 jsonArray = jsonObject.getJSONArray(arrName);

如果我们使用Gson解析的话:

Type listType = new TypeToken<List<SearchCompanyResultBean>>() {
        }.getType();
  //这里的json是字符串类型 = jsonArray.toString();
List<SearchCompanyResultBean> list = new Gson().fromJson(json, listType );

这里我的实体类是SearchCompanyResultBean。 
通过Gson将json数组转换成list集合 
有了数据源,然后在设置到ui上