Aucune valeur pour JSON PARSE

Question

Il semble que quelque chose me manque lorsque j'essaye d'analyser ce JSON. Je continue d'obtenir une erreur No Value pour l'élément JSON. (Voir logcat ci-dessous).

Voici le JSON je tire du moteur app datastore:

{"items":[{"description":"payment confirmed","emailAddress":"abc@aqw.com","id":"Fri Aug 30 17:20:35 EDT 2013","nameFirst":"Bill","nameLast":"Sanders","phone":"5555555555","state":"KS","streetAddress":"123 Rick Dr","zipCode":"44444","kind":"contactinfoendpoint#resourcesItem"},{"description":"payment confirmed","emailAddress":"qwe@msn.com","id":"Fri Aug 30 17:21:37 EDT 2013","nameFirst":"Frank","nameLast":"Lloyd","phone":"5554567896","state":"KY","streetAddress":"999 Rock St","zipCode":"44555","kind":"contactinfoendpoint#resourcesItem"}],"kind":"contactinfoendpoint#resources","etag":"\"NiDXI3T89oRrAPGJAhgGQje1Z0w/z0W4p01mjHc5cNgcOt3Kb_1xo8E\""} 

Quand je lance ce code je reçois ce dans le LogCat et ma mise en page gonfleur est vide:

08-31 11:11:37.470: E/log_tag(15026): Error parsing data org.json.JSONException: No value for item 

Voici le code de l'activité:

public class FinderActivity extends ListActivity { 


private static final String TAG_ID = "id"; 
private static final String TAG_FIRSTNAME = "nameFirst"; 
private static final String TAG_LASTNAME = "nameLast"; 
private static final String TAG_EMAIL = "emailAddress"; 
private static final String TAG_ADDRESS = "address"; 
private static final String TAG_STATE = "state"; 

private static final String TAG_PHONE = "phone"; 
JSONArray contacts = null; 

ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>(); 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    new EndpointsTask().execute(getApplicationContext()); 

} 

public class EndpointsTask extends AsyncTask<Context, Integer, Long> { 

    public Long doInBackground(Context... contexts) { 

     Contactinfoendpoint.Builder endpointBuilder = new Contactinfoendpoint.Builder(
      AndroidHttp.newCompatibleTransport(), 
      new JacksonFactory(), 
      new HttpRequestInitializer() { 
      public void initialize(HttpRequest httpRequest) { } 
      }); 
    Contactinfoendpoint endpoint = CloudEndpointUtils.updateBuilder(
    endpointBuilder).build(); 

    try { 

    // final TextView detail = (TextView)findViewById(R.id.textView100); 

    String apples = endpoint.listContactInfo().execute().toString(); 

    JSONObject jObject = new JSONObject(apples); 

      try{ 
     //Get the element that holds the earthquakes (JSONArray) 
     JSONArray contacts = jObject.getJSONArray("item"); 

     for(int i = 0; i < contacts.length(); i++){ 
      JSONObject c = contacts.getJSONObject(i); 

      // Storing each json item in variable 
      String id = c.getString(TAG_ID); 
      String nameFirst = c.getString(TAG_FIRSTNAME); 
      String nameLast = c.getString(TAG_LASTNAME); 
      String email = c.getString(TAG_EMAIL); 
      String address = c.getString(TAG_ADDRESS); 
      String phone = c.getString(TAG_PHONE); 

      // creating new HashMap 
      HashMap<String, String> map = new HashMap<String, String>(); 

      // adding each child node to HashMap key => value 
      map.put(TAG_ID, id); 
      map.put(TAG_FIRSTNAME, nameFirst); 
      map.put(TAG_EMAIL, email); 
      map.put(TAG_PHONE, phone); 

      // adding HashList to ArrayList 
      contactList.add(map); 

     } 

      }catch(JSONException e)  { 
      Log.e("log_tag", "Error parsing data "+e.toString()); 
      } 

      ListAdapter adapter = new SimpleAdapter(FinderActivity.this, contactList, 
        R.layout.main, 
        new String[] { TAG_FIRSTNAME, TAG_EMAIL, TAG_PHONE }, new int[] { 
          R.id.name, R.id.email, R.id.mobile }); 

      setListAdapter(adapter); 

      // selecting single ListView item 
      ListView lv = getListView(); 

    } catch (IOException e) { 
    e.printStackTrace(); 
    } catch (JSONException e) { 
    // TODO Auto-generated catch block 
    e.printStackTrace(); 
} 
     return (long) 0; 
    } 


    } 

Answer 1

votre nom d'objet n'est pas item son items

Utilisez le code ci-dessous pour obtenir des articles

JSONObject jsonObj = new JSONObject(str); 
JSONArray jsonArr = jsonObj.getJSONArray("items"); 

for(int i =0 ; i<jsonArr.length() ;i++){ 
    JSONObject jsonObj1 = jsonArr.getJSONObject(i); 

    System.out.println(); 
    System.out.println((i+1)+" ==========JSON OBJECT IS :========== "); 

    Iterator<String> iter = jsonObj1.keys(); 
    while(iter.hasNext()){ 
     String key = iter.next(); 
     System.out.println(key + " : " + jsonObj1.get(key)); 


    } 
} 

SORTIE:

1 ==========JSON OBJECT IS :========== 
streetAddress : 123 Rick Dr 
id : Fri Aug 30 17:20:35 EDT 2013 
phone : 5555555555 
nameLast : Sanders 
nameFirst : Bill 
description : payment confirmed 
zipCode : 44444 
state : KS 
emailAddress : abc@aqw.com 
kind : contactinfoendpoint#resourcesItem 

2 ==========JSON OBJECT IS :========== 
streetAddress : 999 Rock St 
id : Fri Aug 30 17:21:37 EDT 2013 
phone : 5554567896 
nameLast : Lloyd 
nameFirst : Frank 
description : payment confirmed 
zipCode : 44555 
state : KY 
emailAddress : qwe@msn.com 
kind : contactinfoendpoint#resourcesItem 

Answer 2

l'objet JSON ci-dessus contient un tableau de items.So vous devez d'abord analyser les "éléments", puis le contenu des éléments.

Answer 3

Oui. D'abord besoin d'obtenir Array element, puis récupérer les éléments de tableau.

JSONParser parser=new JSONParser(); 

JSONObject jsonObject = (JSONObject)parser.parse(apples); 

JSONArray jsonArr = (JSONArray)jsonObject.get("items"); 

System.out.println("jsonArr.get(0));