'クラスのargsコンストラクタが存在しません'、それはあります

Question

エラーNo-args constructor for class MwVolleyApi$Page does not exist. Register an InstanceCreator with Gson for this type to fix this problemが表示されます。私はこれをよく読んできたし、私のために働くように見えるどちらもソリューションの2種類を発見した：

1. https://github.com/google/gson/issues/135を - 何の引数を作成していない - 静的ネストされたクラス（私は）
2. No-args constructor for class XXX does not existを使用しますクラスのコンストラクタ（私が行った）

私は何が欠けていますか？

完全なエラーメッセージ：

10-08 17:07:53.790: E/Volley(31902): [4551] NetworkDispatcher.run: Unhandled exception java.lang.RuntimeException: No-args constructor for class fr.free.nrw.commons.upload.MwVolleyApi$Page does not exist. Register an InstanceCreator with Gson for this type to fix this problem. 
10-08 17:07:53.790: E/Volley(31902): java.lang.RuntimeException: No-args constructor for class fr.free.nrw.commons.upload.MwVolleyApi$Page does not exist. Register an InstanceCreator with Gson for this type to fix this problem. 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.MappedObjectConstructor.constructWithNoArgConstructor(MappedObjectConstructor.java:64) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.MappedObjectConstructor.construct(MappedObjectConstructor.java:53) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonObjectDeserializationVisitor.constructTarget(JsonObjectDeserializationVisitor.java:41) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationVisitor.getTarget(JsonDeserializationVisitor.java:56) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:101) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationVisitor.visitChild(JsonDeserializationVisitor.java:107) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationVisitor.visitChildAsObject(JsonDeserializationVisitor.java:95) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonArrayDeserializationVisitor.visitArray(JsonArrayDeserializationVisitor.java:73) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:109) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationVisitor.visitChild(JsonDeserializationVisitor.java:107) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationVisitor.visitChildAsArray(JsonDeserializationVisitor.java:102) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonObjectDeserializationVisitor.visitArrayField(JsonObjectDeserializationVisitor.java:81) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.ObjectNavigator.navigateClassFields(ObjectNavigator.java:154) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:123) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationVisitor.visitChild(JsonDeserializationVisitor.java:107) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationVisitor.visitChildAsObject(JsonDeserializationVisitor.java:95) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonObjectDeserializationVisitor.visitObjectField(JsonObjectDeserializationVisitor.java:62) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.ObjectNavigator.navigateClassFields(ObjectNavigator.java:156) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:123) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:73) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:51) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.Gson.fromJson(Gson.java:495) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.Gson.fromJson(Gson.java:444) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.Gson.fromJson(Gson.java:396) 
10-08 17:07:53.790: E/Volley(31902): at com.google.gson.Gson.fromJson(Gson.java:372) 
10-08 17:07:53.790: E/Volley(31902): at fr.free.nrw.commons.upload.MwVolleyApi$QueryRequest.parseNetworkResponse(MwVolleyApi.java:140) 
10-08 17:07:53.790: E/Volley(31902): at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:123) 
10-08 17:07:53.790: E/fr.free.nrw.commons.upload.MwVolleyApi$LogResponseErrorListener(31902): com.android.volley.VolleyError: java.lang.RuntimeException: No-args constructor for class fr.free.nrw.commons.upload.MwVolleyApi$Page does not exist. Register an InstanceCreator with Gson for this type to fix this problem. 

関連するコード：

private static class QueryRequest extends JsonRequest<QueryResponse> { 
    private static final String TAG = QueryRequest.class.getName(); 

    public QueryRequest(String url, 
         Response.Listener<QueryResponse> listener, 
         Response.ErrorListener errorListener) { 
     super(Request.Method.GET, url, null, listener, errorListener); 
    } 

    @Override 
    protected Response<QueryResponse> parseNetworkResponse(NetworkResponse response) { 
     String json = parseString(response); 
     QueryResponse queryResponse = GSON.fromJson(json, QueryResponse.class); 
     return Response.success(queryResponse, cacheEntry(response)); 
    } 

    private Cache.Entry cacheEntry(NetworkResponse response) { 
     return HttpHeaderParser.parseCacheHeaders(response); 
    } 

    private String parseString(NetworkResponse response) { 
     try { 
      return new String(response.data, HttpHeaderParser.parseCharset(response.headers)); 
     } catch (UnsupportedEncodingException e) { 
      return new String(response.data); 
     } 
    } 
} 


private static class QueryResponse { 
    private Query query = new Query(); 

    private String printSet() { 
     if (categorySet == null || categorySet.isEmpty()) { 
      GpsCatExists.setGpsCatExists(false); 
      Log.d(TAG, "gpsCatExists=" + GpsCatExists.getGpsCatExists()); 
      return "No collection of categories"; 
     } else { 
      GpsCatExists.setGpsCatExists(true); 
      Log.d(TAG, "gpsCatExists=" + GpsCatExists.getGpsCatExists()); 
      return "CATEGORIES FOUND" + categorySet.toString(); 
     } 

    } 

    @Override 
    public String toString() { 
     if (query != null) { 
      return "query=" + query.toString() + "\n" + printSet(); 
     } else { 
      return "No pages found"; 
     } 
    } 
} 

private static class Query { 
    private Page [] pages; 

    @Override 
    public String toString() { 
     StringBuilder builder = new StringBuilder("pages=" + "\n"); 
     if (pages != null) { 
      for (Page page : pages) { 
       builder.append(page.toString()); 
       builder.append("\n"); 
      } 
      builder.replace(builder.length() - 1, builder.length(), ""); 
      return builder.toString(); 
     } else { 
      return "No pages found"; 
     } 
    } 
} 

private static class Page { 
    private int pageid; 
    private int ns; 
    private String title; 
    private Category[] categories; 
    private Category category; 

    public Page() { 
    } 

    @Override 
    public String toString() { 

     StringBuilder builder = new StringBuilder("PAGEID=" + pageid + " ns=" + ns + " title=" + title + "\n" + " CATEGORIES= "); 

     if (categories == null || categories.length == 0) { 
      builder.append("no categories exist\n"); 
     } else { 
      for (Category category : categories) { 
       builder.append(category.toString()); 
       builder.append("\n"); 
       if (category != null) { 
        String categoryString = category.toString().replace("Category:", ""); 
        categorySet.add(categoryString); 
       } 
      } 
     } 

     categoryList = new ArrayList<String>(categorySet); 
     builder.replace(builder.length() - 1, builder.length(), ""); 
     return builder.toString(); 
    } 
} 

private static class Category { 
    private String title; 

    @Override 
    public String toString() { 
     return title; 
    } 
} 

Answer 1

Gsonは、プライベートネストされたクラスをインスタンス化することはできません。 Pageクラスを公開クラスにします。

public static class Page {...}