0

このJSONファイルを正しく解析する方法を理解するのに苦労しています。

{
    "count": 10, 
    "timestamp": 1333243153, 
    "total": 100, 
    "diggs": [
        {
            "date": 1333243146, 
            "item": {
                "status": "upcoming", 
                "container": {
                    "name": "Politics", 
                    "short_name": "politics"
                }, 
                "description": "Major steps toward the disestablishment of Norway's state church, the (Lutheran) Church of Norway, were passed by the government on March 16 in its weekly session with King Harald V.", 
                "title": "National Secular Society - Norway continues the long process of disestablishing the Lutheran Church", 
                "submit_date": 1333206325, 
                "media": 0, 
                "diggs": 5, 
                "comments": 0, 
                "topic": {
                    "name": "Politics", 
                    "short_name": "politics"
                }, 
                "shorturl": {
                    "short_url": "http://digg.com/news/politics/national_secular_society_norway_continues_the_long_process_of_disestablishing_the_lutheran_church", 
                    "view_count": 0
                }, 
                "promote_date": null, 
                "link": "http://www.secularism.org.uk/news/2012/03/norway-continues-the-long-process-of-disestablishing-the-lutheran-church", 
                "href": "http://digg.com/news/politics/national_secular_society_norway_continues_the_long_process_of_disestablishing_the_lutheran_church", 
                "id": "20120331150525:56935e86-2dbf-4831-ad60-50def7781e68"
            }, 
            "user": {
                "name": "ghelms", 
                "links": [], 
                "registered": 1158007588, 
                "profileviews": 0, 
                "fullname": "Gary Helms", 
                "icon": "http://cdn2.diggstatic.com/user/614412/l.2001177284.png"
            }, 
            "digg_id": "20120401011907:5cf92ee9-e915-4358-b14f-cf140b760469"
        }, 
    ], 
    "offset": 0
 }

「date」、「description」、「title」、「diggs」、「link」、「digg_id」の一部の要素のみを取得しようとしています。解析しようとすると、listViewで何も表示されませんが、GetMethodクラスでStringを使用すると、API全体が文字列に解析され、正常に出力されます。

私のコード：

public DiggItemList lastDigg () throws Exception {
    ArrayList<HashMap<String,DiggItem>> diggsList = new  ArrayList<HashMap<String, DiggItem>>();
    JSONArray diggs = null;
    JSONObject json = null;
    Intent in = getIntent();
    String short_name = in.getStringExtra(TAG_SHORT_NAME);
    GetMethod get = new GetMethod();
    json = get.getInternetData();

    try {
        diggs = json.getJSONArray("diggs");

            dlists = new DiggItemList();
            for (int i = 0; i < diggs.length(); i++) {
                JSONObject c = diggs.getJSONObject(i);
                String date = c.getString("date");
                String description = c.getString("description");
                String title = c.getString("title");
                int digg = c.getInt("diggs");
                String link = c.getString("link");
                int digg_id = c.getInt("digg_id");

                //JSONObject topic = c.getJSONObject("topic");
                    //String sn = topic.getString("short_name");

                DiggItem di = new DiggItem();
                di.setDate(c.getInt("date"));
                di.setDescription(c.getString("description"));
                di.setTitle(c.getString("title"));
                di.setDiggs(c.getInt("diggs"));
                di.setLink(c.getString("link"));
                di.setDigg_id(c.getString("digg_id"));
                    dlists.add(di);
                    /*
                if (sn.equals(short_name)) {
                    dlists.add(di);
                }
                                */
            }

    }catch (JSONException e) {
        e.printStackTrace();
    }
    return dlists;
}

APIを取得するためのクラス。（http://services.digg.com/2.0/digg.getAll）。

public class GetMethod {

    public JSONObject getInternetData() throws Exception {
        BufferedReader in = null;
        String data = "";
        JSONObject jObj = null;
        try {
            HttpClient client = new DefaultHttpClient();
            URI website = new URI("http://services.digg.com/2.0/digg.getAll");
            HttpGet request = new HttpGet();
            request.setURI(website);
            HttpResponse response = client.execute(request);
            in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            StringBuffer sb = new StringBuffer("");
            String line = "";

            while ((line = in.readLine()) != null) {
                    sb.append(line + "\n");
            }
            in.close();
            data = sb.toString();
        }finally {
            if (in != null) {
                try {
                    in.close();
                }catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        try {
            jObj = new JSONObject(data);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;
    }
    }
4

3 に答える 3

1

希望することを行う簡単な方法を提案するだけです...詳細については、チュートリアルを参照して学習してください... 

public void parseData throws Exception {

            try {
    HttpClient httpclient = new DefaultHttpClient();

                // Prepare a request object
        HttpGet httpget = new HttpGet("http://services.digg.com/2.0/digg.getAll");

                // Execute the request
                HttpResponse response;
                // Get hold of the response entity
                    HttpEntity entity = response.getEntity();
                    // If the response does not enclose an entity, there is no need
                    // to worry about connection release

                    if (entity != null) {

                        // A Simple JSON Response Read
                        // InputStream instream = entity.getContent();
                        // String result = convertStreamToString(instream).trim();

                        String result = EntityUtils.toString(entity);
    JsonObject json = new JsonObject(result);

    JSONArray diggsJsonArray = json.getJSONArray("diggs");

    for(int i =0;i<diggsJsonArray.length;i++)
    {
    JsonObject individualDiggsObj = diggsJsonArray.getJSONObject(i);

      DiggItem di = new DiggItem();
                    di.setDate(individualDiggsObj.getInt("date"));
     di.setDiggId(individualDiggsObj.getString("digg_id"));
    JSONOnejct itesmJson = new JSONOBJECT(individualDiggsObjgetJSONObject("item");

    //NOw Fetch and Set the values of status,title,description,, etc from the itemsJson to your collection.

    //Similarly begin with other inner Array's and Object's if available.   
                }catch(Exception e)
    {
    e.printStackTrace();
        }
于 2012-04-01T07:19:31.320 に答える
0

あなたのコード日付では、「DiggItem di」に格納しているときに、整数値である c.getInt("date") を使用している文字列型です。また、digg_id の値は英数字の組み合わせであるため、digg_id を整数にすることはできず、ここでも文字列を使用できます。

于 2012-04-01T07:23:44.430 に答える