Android JSON Parsing-API

Question

ich herauszufinden, eine harte Zeit, wie diese JSON-Datei korrekt zu analysieren.

{ 
    "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 
} 

Ich versuche nur einige der Elemente "Datum", "Beschreibung", "Titel", "Diggs", "Link" und "digg_id" zu bekommen. Wenn ich versuche zu analysieren, wird es nicht funktionieren in ListView nichts auftaucht, aber wenn ich einen String in meiner GetMethod-Klasse verwenden, wird es die gesamte API in eine Zeichenfolge analysieren und es gut drucken.

Mein Code:

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; 
} 

Klasse der API zu erhalten. (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; 
    } 
    } 

Answer 1

was darauf hindeutet, nur eine einfache Art und Weise des gewünschten ... Weitere Details finden und studiert das Tutorial zu tun ... https://stackoverflow.com/questions/5867544/android-json-parsing-tutorial/9742384#9742384

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(); 
     } 

Answer 2

In Ihrem Code Datum einen String-Typen, wo, wie beim Speichern In "DiggItem di" verwenden Sie c.getInt ("date"), das ist ein Integer-Wert. Auch die digg_id kann nicht Integer sein, da als Antwort der Wert für digg_id eine Kombination aus alphanumerischen Zeichen ist, so dass Sie String auch hier verwenden können.