Fehler beim Deserialisieren von Objekten mit fromJson?

Question

Ich benutze Gson, um meine Json von MySQL zu lesen. aber wenn ich app ausführen, gibt es den Wert null zurück. Ich weiß nicht, was ist mit Fehler, denn wenn ich app in lokalen mit dem gleichen mysql läuft es funktioniert. Aber wenn ich im Host laufe, gibt es null zurück. Bitte hilf mir!

{"group": 
[{"category_id":"15","title":"Zing card - Zing xu"}, 
{"category_id":"14","title":"Th\u1ebb Gate - FPT"}, 
{"category_id":"20","title":"Vcoin - VTC - Audition"}, 
{"category_id":"21","title":"Garena"}, 
{"category_id":"32","title":"Mobay card"}, 
{"category_id":"33","title":"BIT Card"}, 
{"category_id":"34","title":"Oncash"}], 
"product": 
[ 
{"id":"39","group_id":"22","name":"Oncash","price":{"USD":9,"AUD":12.756909992913,"VND":195000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/oncach-e3bb9fa75d.gif","sku":"ONCASH200"}, 
{"id":"87","group_id":"33","name":"TH\u1eba BIT 5 TRI\u1ec6U","price":{"USD":252.42,"AUD":357.7888022679,"VND":4950000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/uwrki7jx-6198ed1975.gif","sku":"Bit5M"}, 
{"id":"88","group_id":"33","name":"TH\u1eba BIT 2 TRI\u1ec6U","price":{"USD":100.98,"AUD":143.13253012048,"VND":1980000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/91intahd-b42a80c01d.gif","sku":"Bit2M"}, 
{"id":"89","group_id":"33","name":"TH\u1eba BIT 1 TRI\u1ec6U","price":{"USD":50.48,"AUD":71.552090715804,"VND":990000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/nwd03knt-264a8d02fe.gif","sku":"Bit1M"}, 
{"id":"92","group_id":"33","name":"TH\u1eba BIT 500K","price":{"USD":25.23,"AUD":35.761871013466,"VND":495000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/8hxdajdl-9c8001602e.gif","sku":"Bit500K"}, 
{"id":"90","group_id":"33","name":"TH\u1eba BIT 200K","price":{"USD":10.08,"AUD":14.287739192062,"VND":198000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/ql3cn6iu-b4d8c3b407.gif","sku":"Bit200K"}, 
{"id":"91","group_id":"33","name":"TH\u1eba BIT 100K","price":{"USD":5.03,"AUD":7.1296952515946,"VND":100000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/oupebhyo-0a61ca65b2.gif","sku":"Bit100K"}, 
{"id":"93","group_id":"33","name":"TH\u1eba BIT 50K","price":{"USD":2.69,"AUD":3.8128986534373,"VND":50000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/zvznjqnz-52c80ccfe6.gif","sku":"Bit50K"}, 
{"id":"121","group_id":"33","name":"Th\u1ebb BIT 20k","price":{"USD":1.06,"AUD":1.5024805102764,"VND":20000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/the-bit-20k-6b4035c02d.gif","sku":"Bit20K"}, 
{"id":"80","group_id":"32","name":"TH\u1eba MOBAY 500K","price":{"USD":25.23,"AUD":35.761871013466,"VND":495000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/u5jywcz0-55285adfd7.gif","sku":"Mobay500K"}, 
{"id":"83","group_id":"32","name":"TH\u1eba MOBAY 200K","price":{"USD":10.08,"AUD":14.287739192062,"VND":198000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/db8f1s3y-170821fbe1.gif","sku":"Mobay200K"}, 
{"id":"82","group_id":"32","name":"TH\u1eba MOBAY 100K","price":{"USD":5.03,"AUD":7.1296952515946,"VND":100000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/57mzcwfk-40f4d60542.gif","sku":"Mobay100K"}, 
{"id":"85","group_id":"32","name":"TH\u1eba MOBAY 50K","price":{"USD":2.69,"AUD":3.8128986534373,"VND":50000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/hf8jilab-11ed516444.gif","sku":"Mobay50K"}, 
{"id":"84","group_id":"32","name":"TH\u1eba MOBAY 20K","price":{"USD":1.06,"AUD":1.5024805102764,"VND":20000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/pvrh3jey-dd0894e849.gif","sku":"Mobay20K"}, 
{"id":"53","group_id":"20","name":"Vcoin 200k","price":{"USD":10.08,"AUD":14.287739192062,"VND":198000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/v200-61d2763add.gif","sku":"VNS-VCOIN200K"}, 
{"id":"37","group_id":"20","name":"Vcoin 20k","price":{"USD":1.06,"AUD":1.5024805102764,"VND":20000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/v20-e0f120eefd.gif","sku":"vcoin20k"}, 
{"id":"118","group_id":"20","name":"Vcoin 1 tri\u1ec7u","price":{"USD":50.48,"AUD":71.552090715804,"VND":990000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/rpwzfkfy-655e715791.gif","sku":"VCOIN1TRIEU"}, 
{"id":"45","group_id":"14","name":"Gate 5 tri\u1ec7u","price":{"USD":252.42,"AUD":357.7888022679,"VND":4950000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/gate5trieu-c43aa69716.gif","sku":"GATE5000k"}, 
{"id":"44","group_id":"14","name":"Gate 2 tri\u1ec7u","price":{"USD":100.98,"AUD":143.13253012048,"VND":1980000},"images":"http:\/\/vnsupermark.com\/uploads\/catalog\/gate2trieu-091d584fce.gif","sku":"thegate2trieu"} 
]} 

Funktion Rückkehr myjson

public ResListProduct getListProducts(Context context) { 
     Gson gson = new Gson(); 
     ResListProduct resListProduct = null; 
     resListProduct = new ResListProduct(); 

     try { 

      String urlApi = Store.getInstances(context).getA(); 
      // URL 

      HashMap<String, String> params = new HashMap<String, String>(); 
      int i = MainActivity.getVariable(); 
      // all product 

      if (i == 1) { 
       params.put("command", "get_products"); 
      } 
      if (i > 1) { 
       ArrayList<String> s = new ArrayList<String>(); 
       s = MainActivity.getnamegrouptrem(); 
       for (int j = 0; j < i - 1; j++) { 
        String[] titleActionbars = s.toArray(new String[s.size()]); 
        params.put("command", "get_product"); 
        params.put("cagory", titleActionbars[j]); 
       } 

       // if (i == 9) { 
       // params.put("command", "get_product"); 
       // params.put("cagory", String.valueOf(21)); 
       // }// test autogen memu 
      } 

      InputStream stream = retrieveStream(urlApi, params, false, null, 
        null); 
      Reader reader = new InputStreamReader(stream); 
      //Printf JSON 
//   BufferedReader in = new BufferedReader(reader); 
//   String read; 
//   while ((read = in.readLine()) != null) {     
//    System.out.println("JSON" + read); 
//   } 



      // parse json to get list product 
      resListProduct = gson.fromJson(reader, ResListProduct.class); 



     } catch (Exception e) { 
      sendException(context, 
        "getListProduct: " + Log.getStackTraceString(e)); 
     } 

     return resListProduct; 
    } 

Klassenobjekt

public class ResListProduct { 
     @SerializedName("product") 
     private List<Product> products; 
     @SerializedName("group") 
     private List<GroupProduct> groups; 

     public ResListProduct() { 
     } 

     public List<Product> getProducts() { 
      return products; 
     } 

     public List<GroupProduct> getGroups() { 
      return groups; 
     } 

    } 

public class Product implements Serializable{ 
    private static final long serialVersionUID = 6061052006970796100L; 

    @SerializedName("id") 
    private String idProduct; 
    @SerializedName("group_id") 
    private String groupId; 
    @SerializedName("name") 
    private String nameProduct; 
    @SerializedName("price") 
    private Price priceProduct; 
    @SerializedName("images") 
    private String urlImagesProduct; 
    @SerializedName("sku") 
    private String skuProduct; 
    @SerializedName("names") 
    private String names; 

    // quantity for each product 
    private int quantity; 

    // title group product 
    private String titleGroup; 

    public Product(String titleGroup) { 
     this.titleGroup = titleGroup; 
    } 

    public String getIdProduct() { 
     return idProduct; 
    } 

    public String getGroupId() { 
     return groupId; 
    } 

    public String getNameProduct() { 
     return nameProduct; 
    } 

    public Price getPriceProduct() { 
     return priceProduct; 
    } 

    public String getUrlImagesProduct() { 
     return urlImagesProduct; 
    } 

    public String getSkuProduct() { 
     return skuProduct; 
    } 

    public int getQuantity() { 
     return quantity; 
    } 

    public void setQuantity(int quantity) { 
     this.quantity = quantity; 
    } 

    public String getTitleGroup() { 
     return titleGroup; 
    } 

    public String getNames() { 
     return names; 
    } 

    public void setNames(String names) { 
     this.names = names; 
    } 


} 

public class GroupProduct { 
    @SerializedName("category_id") 
    public String groupId; 
    @SerializedName("title") 
    public String name; 

    public String getName() { 
     return name; 
    } 

    public GroupProduct() { 
    } 

    public String getGroupId() { 
     return groupId; 
    } 

    public void setGroupId(String groupId) { 
     this.groupId = groupId; 
    } 


} 

Answer 1

Ist die akzeptierte Antwort hilft Ihnen hier? Im Grunde besagt es, dass der Stream zweimal konsumiert wird und somit das Reader-Objekt nichts zu analysieren hat. Parsing json directly using input stream