在解析JSON数据的android空响应即将到来

问题描述

###这是在整个应用程序的主要方法取决于

 私人无效setOnListener（）{
        // TODO自动生成方法存根
        btnGetData.setOnClickListener（新View.OnClickListener（）{            @覆盖
            公共无效的onClick（查看为arg0）{
                // TODO自动生成方法存根
                新JSONParsing（）执行（）;            }        }）;        btnStoreData.setOnClickListener（新View.OnClickListener（）{            @覆盖
            公共无效的onClick（查看为arg0）{
                // TODO自动生成方法存根
            ///的System.out.println（价值观：+ cursor.getColumnCount（））;
                光标= newrummydb.query（DATABASE_TABLE，新的String [] {
                        city​​id，城市名，createddate，isactive，STATEID，
                        Statename的}，NULL，NULL，NULL，NULL，NULL）;                getfromdatabase（）;
            }
        }）;    }    保护无效getfromdatabase（）
        {            ///从数据库获取数据                如果（cursor.moveToFirst（））
                {
                    做
                    {                tvCity_ID.setText（cursor.getString（0））;
                tvCityName.setText（cursor.getString（1））;
                tvCreatedDate.setText（cursor.getString（2））;
                tvIsActive.setText（cursor.getString（3））;
                tvState_ID.setText（cursor.getString（4））;
                tvStateName.setText（cursor.getString（5））;
                tvUpdatedDate.setText（cursor.getString（6））;
                    }
                    而（cursor.moveToNext（））;
                }
        mydb.close（）;
        }    保护类JSONParsing扩展的AsyncTask＆LT;字符串，字符串，JSONObject的＆GT; {
        私人ProgressDialog progressdialog;        @覆盖
        在preExecute保护无效（）{
            super.on preExecute（）;
            progressdialog =新ProgressDialog（NewRummyActivity.this）;            progressdialog.setMessage（检索数据...）;
            progressdialog.setCancelable（真）;
            progressdialog.show（）;        }        @覆盖
        受保护的JSONObject doInBackground（字符串... PARAMS）{
            // TODO自动生成方法存根
            RummyJSONParser jsonparsing =新RummyJSONParser（）;
            JSONObject的newrummy = jsonparsing.getJSONFromURL（URL）;            返回newrummy;
        }        @覆盖
        保护无效onPostExecute（JSONObject的newrummy）{
            progressdialog.dismiss（）;            尝试{                ***
 

---

                    // data.set_ID(Integer.parseInt(newrummy.getString(DFID)));
                    values.put("_id", i + 1);

                    cityid = newrummy.getJSONArray(cityid).getString(i);
                    values.put("city", cityid);

                    cityname = newrummy.getJSONArray(cityname).getString(i);
                    values.put("cityname", cityname);

                    createddate = newrummy.getJSONArray(createddate).getString(i);
                    values.put("cityname", createddate);
                    isactive = newrummy.getJSONArray(isactive).getString(i);
                    values.put("ground", isactive);
                    stateid = newrummy.getJSONArray(stateid).getString(i);
                    values.put("stateid", stateid);
                    statename = newrummy.getJSONArray(statename).getString(i);
                    values.put("statename", statename);
                    updateddate = newrummy.getJSONArray(updateddate).getString(i);
                    values.put("updateddate", updateddate);
                    newrummydb.insert(DATABASE_TABLE, null, values);

                }

                final CustomAdapter adapter = new CustomAdapter(
                        NewRummyActivity.this, R.layout.newrummylistitem,
                        cursor);
                newrummydatalist.setAdapter(adapter);
                adapter.notifyDataSetChanged();
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();

            }
        }

    }

}

My LOGCAT showing this kind of exception ::

04-15 19:06:36.713: I/System.out(28523): Values are:null
04-15 19:06:36.845: W/System.err(28523): org.json.JSONException: No value for cityMasterEntity
04-15 19:06:36.845: W/System.err(28523):    at org.json.JSONObject.get(JSONObject.java:354)
04-15 19:06:36.845: W/System.err(28523):    at org.json.JSONObject.getJSONArray(JSONObject.java:544)
04-15 19:06:36.845: W/System.err(28523):    at com.example.newrummyjson.NewRummyActivity$JSONParsing.onPostExecute(NewRummyActivity.java:168)
04-15 19:06:36.845: W/System.err(28523):    at com.example.newrummyjson.NewRummyActivity$JSONParsing.onPostExecute(NewRummyActivity.java:1)
04-15 19:06:36.845: W/System.err(28523):    at android.os.AsyncTask.finish(AsyncTask.java:631)

解决方案

        json=sb.toString();
        System.out.println("Values are:" +sb);
        newrummy=new JSONObject(); //problem lies here

    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return newrummy;

the problem with your code you are returning an empty json object.

Change your code from,

newrummy=new JSONObject(); to newrummy=new JSONObject(json);

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