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我正在制作一个使用两个微调器的 android 应用程序。在第一个微调器中，我正在显示已成功完成的 JSON 数据。现在通过单击第一个微调器的一项，我需要将来自另一个 JSON 服务的数据显示到第二个微调器中。

首次服务（我city_name在第一个微调器上显示此服务）：

{"result":{"data":[{"city_id":"16","city_name":"\u00c4ngelholm"},
{"city_id":"23","city_name":"B\u00e5stad"},
{"city_id":"22","city_name":"Halmstad"},
{"city_id":"19","city_name":"H\u00f6gan\u00e4s"},{"city_id":"20","city_name":"Helsingborg"},
{"city_id":"15","city_name":"Klippan"},
{"city_id":"24","city_name":"Kungsbacka"},
{"city_id":"21","city_name":"Laholm"},{"city_id":"18","city_name":"Landskrona"}],
"status":"true","description":""}}

二服务：

{"result":{"data":[{"category_id":"18","category":"Aff\u00e4rsverksamhet",
"city_id":"16","city_name":"\u00c4ngelholm"},{"category_id":"19","category":"\u00d6vrigt",
"city_id":"16","city_name":"\u00c4ngelholm"},{"category_id":"13","category":"Bostad",
"city_id":"16","city_name":"\u00c4ngelholm"},{"category_id":"15","category":"Elektronik",
"city_id":"16","city_name":"\u00c4ngelholm"},{"category_id":"12","category":"F\u00f6r hemmet","city_id":"16","city_name":"\u00c4ngelholm"},{"category_id":"11","category":"Fordon",
"city_id":"16","city_name":"\u00c4ngelholm"},
{"category_id":"16","category":"Fritid & Hobby",
    "city_id":"16","city_name":"\u00c4ngelholm"}],
    "status":"true","description":""}}

正如您在这两种服务中看到的那样，它们city_id都是city_name常见的领域。如果我city_name从第一个微调器中选择，它将通过city_idor匹配city_name并显示。categorycity_name

下面是我尝试过的代码。

 private class AllCities extends AsyncTask<String, String, JSONObject>
    {
        @Override
        protected void onPreExecute() 
        {
            super.onPreExecute();
        }

        @Override
        protected JSONObject doInBackground(String... params) 
        {
            try
            {
                HttpClient client = new DefaultHttpClient();
                HttpPost post = new HttpPost("url of First Service");

                HttpResponse resp = client.execute(post);

                HttpEntity entity = resp.getEntity();

                String response = EntityUtils.toString(entity);

                return new JSONObject(response);

            }

            catch(Exception ex)
            {
                ex.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(JSONObject result) 
        {
            super.onPostExecute(result);


            if(result != null)
            {
                myList = new ArrayList<HashMap<String,String>>();

                if(! result.has("false"))
                {
                    try
                    {
                        JSONObject object = result.getJSONObject("result");


                        JSONArray array = object.getJSONArray("data");

                        stringArray = new ArrayList<String>();

                        for(int i=0; i<array.length(); i++)
                        {   
                            HashMap<String, String> map = new HashMap<String, String>();
                            map.put("city_id", array.getJSONObject(i).getString("city_id"));                            
                            map.put("city_name", array.getJSONObject(i).getString("city_name"));
                            myList.add(map);

                            stringArray.add(array.getJSONObject(i).getString("city_name"));


                        }

                        ArrayAdapter<String> adapter = new ArrayAdapter<String>(PostAdds.this, 
                                android.R.layout.simple_spinner_item, stringArray);
                        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        spinner_city.setAdapter(adapter);

                    }

                    catch(Exception ex)
                    {
                        ex.printStackTrace();
                    }

                }

            }

            else if(result == null)
            {
                Toast.makeText(PostAdds.this, 
                        "Hittade inga Detaljer Vänligen Kontrollera din Internet-anslutning", 
                        Toast.LENGTH_LONG).show();
            }

        }
    }

 @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) 
    {   
        //what am I suppose to do here????

    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) 
    {


    }
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1 回答 1

0

对不起，迟到的答案。我自己解决了这个问题，但从来没有回到这里发布对我有用的解决方案。现在我发布这个答案，如果有人有同样的问题可以从这里获得帮助。

所以我做了什么

1) Call the first service and populate city names on first spinner and when item is selected of first spinner, save its value in a global String like

String selectedCity; selectedCity = spinner1.getSelectedItem().toString();

2）当单击第一个微调器的任何项目时，调用第二个服务并在填充第二个微调器时进行简单检查。

    ArrayList<String> categories = new ArrayList<String>();
    try {
           JSONObject object = result.getJSONObject("result");
           JSONArray array = object.getJSONArray("data");

           for(int a = 0; a < array.length(); a++) {
                 String cityName = array.getJSONObject(a).getString("city_name");
                if(cityName.equals(selectedCity)) // this check is important
                {
                        categories.add(cityName );
                }
          }
         // after for loop ends populate adapter of second spinner 
         ArrayAdapter<String> adapt = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1, categories);
         spinner2.setAdapter(adapt);
    }
    catch(Exception e) {
          e.printStackTrace();
    }

这样我就得到了我想要的结果。这个问题还有其他解决方案，其中一个是当您调用第二个服务通行证 city_id 或 city_name 以及 url 作为参数时，服务只会返回您所需的类别。

希望这将解决任何有类似问题的人。我Stackoverflow今天刚刚查看了我的个人资料，发现这个问题没有人回答，所以我自己做了:)

于 2015-11-20T12:09:04.810 回答