在android中没有将服务器项目放入我的微调器中？

Question

我想从服务器获取数据到我的微调，但它没有显示任何项目在微调，我也没有得到任何logcat错误也..我采取了这个从1个例子，在我的JSON输出，我只想抓取国家的名字..但它不显示任何：

这是我的java类：

pmcountry = (Spinner) findViewById(R.id.country); 



     //citySpinner = (Spinner) findViewById(City); 
     //locationSpinner = (Spinner) findViewById(R.id.Location); 
     pmcountry .setOnItemSelectedListener(this); 

     country_list = new ArrayList<String>(); 

     //location_list = new ArrayList<String>(); 
     // city_list = new ArrayList<String>(); 

     getData(); 
    } 
    private void getData(){ 
     StringRequest stringRequest = new StringRequest(Config.DATA_URL, 
       new Response.Listener<String>() { 
        @Override 
        public void onResponse(String response) { 
         JSONObject j = null; 
         try { 
          Log.d("Test",response); 
          JSONArray result = new JSONArray(response); 
          //Calling method getCountry to get the Country from the JSON Array 
          getCountry(result); 
         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 
        } 
       },new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
      }}); 
     RequestQueue requestQueue = Volley.newRequestQueue(this); 
     //Adding request to the queue 
     requestQueue.add(stringRequest); 
    } 
    private void getCountry(JSONArray jsonArrayCountry){ 
     //Traversing through all the items in the json array 
     List<Country> countries = new ArrayList<>(); 
     try { 
      String country_name, country_code; 
      JSONObject countries_object; 
      for (int i = 0; i < jsonArrayCountry.length(); i++) { 
       countries_object = jsonArrayCountry.getJSONObject(i); 
       country_code = countries_object.getString("id"); 
       country_name = countries_object.getString("Name"); 
       countries.add(new Country(country_code, country_name)); 
      } 
      /*ArrayAdapter countryAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, countries); 
      pmcountry.setPrompt("--Select Country--"); 
      pmcountry.setAdapter(countryAdapter); 
      pmcountry.setAdapter(new NothingSelectedSpinnerAdapter(countryAdapter, 
        R.layout.contact_spinner_row_nothing_selected,this));*/ 
      pmcountry.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
       @Override 
       public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 

       } 
       @Override 
       public void onNothingSelected(AdapterView<?> arg0) { 
       } 
      }); 

     } catch (JSONException e) { 

     } 
    } 

Answer 1

您试图设置自定义的对象列表List<Country> 通过默认数组适配器使用String的列表。 List<String>。

您必须调整您的代码以设置微调器中的自定义对象列表。

Android: How to bind spinner to custom object list?

这应该解决您的问题。

Answer 2

pmcountry.setAdapter（countryAdapter）; pmcountry.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）;

使用此从服务器获取的所有数据之后

Answer 3

取消注释你的，你是不是设定数据在任何地方微调器..

ArrayAdapter countryAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, countries); 
     pmcountry.setPrompt("--Select Country--"); 
     pmcountry.setAdapter(countryAdapter); 
     pmcountry.setAdapter(new NothingSelectedSpinnerAdapter(countryAdapter, 
       R.layout.contact_spinner_row_nothing_selected,this));