java-在Android中使用Volley从JSON解析数据

我尝试解析“ https://api.instagram.com/v1/media/popular?client_id=”中的JSON数据
              clientId;或任何其他网址,以多种方式！使用了几个JSONParsers,教程,读者..一切,但是仍然无法从这些url中获取任何信息.现在,我正在使用Volley库,但仍然无法正常工作,这是我的代码以及您需要的一切,如果有人有任何想法,请分享.

public  void LoadPictures()   {
    mRequestQueue =  Volley.newRequestQueue(this);
    mRequestQueue.add(new JsonObjectRequest(urlInst, null,
            new Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    try {
                        parseJSON(response);
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }, new ErrorListener() {
        @Override
        public void one rrorResponse(VolleyError error) {
            error.printStackTrace();
        }
    }));

这是我的parseJSON方法：

 private  void parseJSON(JSONObject json) throws JSONException{      
     // JSONObject value = json.getJSONObject("value");
 JSONArray items = json.getJSONArray("data");
 for(int i=0;i<items.length();i++) {
     JSONObject c=(JSONObject) items.get(i);
         JSONObject user = c.getJSONObject("user");
     String name= user.getString("username");
     JSONObject img=c.getJSONObject("images");
         JSONObject thum=img.getJSONObject("thumbnail");
         String urlOfPic = thum.getString("url");  
         PhotoInst photoData=new PhotoInst (i, urlOfPic, name);
         photos.add(photoData);
     }

这是我应该得到的JSON数据：

 "data": [{
    "type": "image",
    "users_in_photo": [],
    "filter": "Gotham",
    "tags": [],
    "comments": { ... },
    "caption": {
        "created_time": "1296656006",
        "text": "ãã¼ãâ¥ã¢ããªå§ãã¦ä½¿ã£ã¦ã¿ãã(^^)",
        "from": {
            "username": "cocomiin",
            "full_name": "",
            "type": "user",
            "id": "1127272"
        },
        "id": "26329105"
    },
    "likes": {
        "count": 35,
        "data": [{
            "username": "mikeyk",
            "full_name": "Kevin S",
            "id": "4",
            "profile_picture": "..."
        }, {...subset of likers...}]
    },
    "link": "http://instagr.am/p/BV5v_/",
    "user": {
        "username": "cocomiin",
        "full_name": "Cocomiin",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_1127272_75sq_1296145633.jpg",
        "id": "1127272"
    },
    "created_time": "1296655883",
    "images": {
        "low_resolution": {
            "url": "http://distillery.s3.amazonaws.com/media/2011/02/01/34d027f155204a1f98dde38649a752ad_6.jpg",
            "width": 306,
            "height": 306
        },
        "thumbnail": {
            "url": "http://distillery.s3.amazonaws.com/media/2011/02/01/34d027f155204a1f98dde38649a752ad_5.jpg",
            "width": 150,
            "height": 150
        },
        "standard_resolution": {
            "url": "http://distillery.s3.amazonaws.com/media/2011/02/01/34d027f155204a1f98dde38649a752ad_7.jpg",
            "width": 612,
            "height": 612
        }
    },
    "id": "22518783",
    "location": null
},

当我尝试放入随机Toast来查看问题出在哪里时,我可以看到我的方法LoadPictures中的onResponse根本没有被调用？我在哪里失败？我只是监督一些小事情还是其他事情吗？

解决方法:

@Mate-从json中可以看到,您正在获取JsonArray,即“数据”.因此,将您的侦听器更改为Listener< JSONArray>. whihc确保它返回JSONArray对象.结果,您的onResponse现在将变为

@Override
public void onResponse(JSONArray response) {
try {
         parseJSON(response);
    } catch (JSONException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
    }
}

让我知道这个是否奏效.

标签：android-volley,json,java,android
来源： https://codeday.me/bug/20191122/2062522.html