Android JSON 访问缩略图元素

Question

我有这个 json 结果 http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=25&q=http://www.abc.net.au/news/feed/51120/rss.xml

我正在尝试访问位于条目>mediaGroups>content>thumbnails>url 中的每篇新闻文章的缩略图

但是，我不确定如何访问元素深处。这是我到目前为止的代码。

public List<NewsObj> constructJSON(String jsonIN){
    ArrayList<NewsObj> newsList = new ArrayList<>();
    try{
        //add more levels to extract json
        JSONObject jsonObject1 = new JSONObject(jsonIN);
        String responseData = jsonObject1.getString("responseData");
        Log.d("RECEIVEJSONOBJECTLEVEL1",responseData);
        JSONObject jsonObject2 = new JSONObject(responseData);
        String feed = jsonObject2.getString("feed");
        Log.d("RECEIVEJSONOBJECTLEVEL2",feed);
        JSONObject jsonObject3 = new JSONObject(feed);
        String entries = jsonObject3.getString("entries");
        Log.d("RECEIVEJSONOBJECTLEVEL3", entries);
        JSONArray jsonArray1 = new JSONArray(entries);
        for(int i=0; i<jsonArray1.length();i++){
            JSONObject mediaGroups = jsonArray1.getJSONObject(i);
            String mediaItems = mediaGroups.getString("mediaGroups");
            String title = mediaGroups.getString("title");
            String url = mediaGroups.getString("link");
            String description = mediaGroups.getString("contentSnippet");
            String publishedDate = mediaGroups.getString("publishedDate");
//                main information for news article
            //for further thumbnail sizes?
            JSONArray jsonArray2 = new JSONArray(mediaItems);
            for(int j=0;j<jsonArray2.length();j++){
                JSONObject contents = jsonArray2.getJSONObject(j);
                String contentItems = contents.getString("contents");
                Log.d("RECEIVEJSONOBJECTARRAY2",contentItems);
                JSONArray jsonArray3 = new JSONArray(contentItems);
                for(int k=0;k<jsonArray3.length();k++){
                    JSONObject items = jsonArray3.getJSONObject(k);
                    //too specific
                    String imgurl = items.getString("url");
                    //Log.d("RECEIVEJSONOBJECTARRAY3",imgurl);
                    NewsObj aObj = new NewsObj(title, imgurl,url, publishedDate);
                    newsList.add(aObj);
                }
            }
        }
    }catch (JSONException e){
        e.printStackTrace();
        Log.d("RECEIVEJSONERROR",e.toString());
    }
    return newsList;
}

Answer 1

你只需要为缩略图制作另一个JSONArray。有关参考，请参阅示例

试试这个

public List<NewsObj> constructJSON(String jsonIN){
ArrayList<NewsObj> newsList = new ArrayList<>();
try{
    //add more levels to extract json
    JSONObject jsonObject1 = new JSONObject(jsonIN);
    String responseData = jsonObject1.getString("responseData");
    Log.d("RECEIVEJSONOBJECTLEVEL1",responseData);
    JSONObject jsonObject2 = new JSONObject(responseData);
    String feed = jsonObject2.getString("feed");
    Log.d("RECEIVEJSONOBJECTLEVEL2",feed);
    JSONObject jsonObject3 = new JSONObject(feed);
    String entries = jsonObject3.getString("entries");
    Log.d("RECEIVEJSONOBJECTLEVEL3", entries);
    JSONArray jsonArray1 = new JSONArray(entries);
    for(int i=0; i<jsonArray1.length();i++){
        JSONObject mediaGroups = jsonArray1.getJSONObject(i);
        String mediaItems = mediaGroups.getString("mediaGroups");
        String title = mediaGroups.getString("title");
        String url = mediaGroups.getString("link");
        String description = mediaGroups.getString("contentSnippet");
        String publishedDate = mediaGroups.getString("publishedDate");
       //                main information for news article
        //for further thumbnail sizes?
        JSONArray jsonArray2 = new JSONArray(mediaItems);
        for(int j=0;j<jsonArray2.length();j++){
            JSONObject contents = jsonArray2.getJSONObject(j);
            String contentItems = contents.getString("contents");
            Log.d("RECEIVEJSONOBJECTARRAY2",contentItems);
            JSONArray jsonArray3 = new JSONArray(contentItems);
            for(int k=0;k<jsonArray3.length();k++){
                JSONObject items = jsonArray3.getJSONObject(k);
                //too specific
                String imgurl = items.getString("url");
                //Log.d("RECEIVEJSONOBJECTARRAY3",imgurl);
                String thumbnails = items.getString("thumbnails");
                JSONArray jsonArray4 = new JSONArray(thumbnails);
                for(int l=0;l<jsonArray4.length();l++){
                JSONObject thumbnails1 = jsonArray4.getJSONObject(l);
                String height = items.getString("height");
                String width = items.getString("width");
                String thumburl = items.getString("url");
                }
                NewsObj aObj = new NewsObj(title, imgurl,url, publishedDate);
                newsList.add(aObj);
            }
        }
    }
}catch (JSONException e){
    e.printStackTrace();
    Log.d("RECEIVEJSONERROR",e.toString());
}
return newsList;
}