Как настроить контент в спине динамически с помощью async-задачи?

Question

Я новичок в android. Я пытаюсь получить данные в spinner из базы данных. Но я не знаю, почему мой список не установлен в spinner.

Мой код

public class AddBasicDetail extends Fragment implements AdapterView.OnItemSelectedListener { 

    // array list for spinner adapter 
    private ArrayList<State> categoriesList; 
    ProgressDialog pDialog; 

    Spinner sp_state; 
    // API urls 
    // Url to create new category 
    private String URL_NEW_CATEGORY = "http://mandirdekhoo.com/app/md_eng/state.php"; 

    public AddBasicDetail() { 
     // Required empty public constructor 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View v = inflater.inflate(R.layout.add_basic_detail, container, false); 

     sp_state = (Spinner) v.findViewById(R.id.sp_state); 
     categoriesList = new ArrayList<State>(); 

     // spinner item select listener 
     //sp_state.setOnItemSelectedListener((AdapterView.OnItemSelectedListener) getActivity()); 

     new GetCategories().execute(); 

     return v; 
    } 

    /** 
    * Adding spinner data 
    * */ 
    private void populateSpinner() { 
     List<String> lables = new ArrayList<String>(); 

     //txtCategory.setText(""); 

     for (int i = 0; i < categoriesList.size(); i++) { 
       lables.add(categoriesList.get(i).getName()); 
     } 

     // Creating adapter for spinner 
     ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getContext(), 
         android.R.layout.simple_spinner_item, lables); 

     // Drop down layout style - list view with radio button 
     spinnerAdapter       .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

     // attaching data adapter to spinner 
     sp_state.setAdapter(spinnerAdapter); 
    } 

    /** 
    * Async task to get all food categories 
    * */ 
    private class GetCategories extends AsyncTask<Void, Void, Void> { 

     @Override 
     protected void onPreExecute() { 
      super.onPreExecute(); 
      pDialog = new ProgressDialog(getContext()); 
      pDialog.setMessage("Fetching food categories.."); 
      pDialog.setCancelable(false); 
      pDialog.show(); 

     } 

     @Override 
     protected Void doInBackground(Void... arg0) { 
      ServiceHandler jsonParser = new ServiceHandler(); 
      String json = jsonParser.makeServiceCall(URL_NEW_CATEGORY, ServiceHandler.GET); 

      Log.e("Response: ", "> " + json); 

      if (json != null) { 

       try { 
        JSONObject jsonObj = new JSONObject(json); 
        Log.e("my response: ", "> " + jsonObj); 
        if (jsonObj != null) { 
         JSONArray categories = jsonObj           .getJSONArray("result"); 

           for (int i = 0; i < categories.length(); i++) { 
            JSONObject catObj = (JSONObject) categories.get(i); 
            State cat = new State(catObj.getInt("id"), 
              catObj.getString("state_name")); 
            categoriesList.add(cat); 
           } 
          } 

         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 

        } else { 
         Log.e("JSON Data", "Didn't receive any data from server!"); 
        } 

        return null; 
       } 

       @Override 
       protected void onPostExecute(Void result) { 
        super.onPostExecute(result); 
        if (pDialog.isShowing()) 
         pDialog.dismiss(); 
        //populateSpinner(); 
       } 

      } 
      @Override 
      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { 
        Toast.makeText(
         getContext(), 
         parent.getItemAtPosition(position).toString() + " Selected" , 
         Toast.LENGTH_LONG).show(); 

      } 

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

мой класс обработчика обслуживание

public class ServiceHandler { 

    static InputStream is = null; 
    static String response = null; 
    public final static int GET = 1; 
    public final static int POST = 2; 

    public ServiceHandler() { 

    } 

    /** 
    * Making service call 
    * @url - url to make request 
    * @method - http request method 
    * */ 
    public String makeServiceCall(String url, int method) { 
     return this.makeServiceCall(url, method, null); 
    } 

    /** 
    * Making service call 
    * @url - url to make request 
    * @method - http request method 
    * @params - http request params 
    * */ 
    public String makeServiceCall(String url, int method, 
            List<NameValuePair> params) { 
     try { 
      // http client 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpEntity httpEntity = null; 
      HttpResponse httpResponse = null; 

      // Checking http request method type 
      if (method == POST) { 
       HttpPost httpPost = new HttpPost(url); 
       // adding post params 
       if (params != null) { 
        httpPost.setEntity(new UrlEncodedFormEntity(params)); 
       } 

       httpResponse = httpClient.execute(httpPost); 

      } else if (method == GET) { 
       // appending params to url 
       if (params != null) { 
        String paramString = URLEncodedUtils 
          .format(params, "utf-8"); 
        url += "?" + paramString; 
       } 
       HttpGet httpGet = new HttpGet(url); 

       httpResponse = httpClient.execute(httpGet); 

      } 
      httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 

     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(
        is, "UTF-8"), 8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      response = sb.toString(); 
     } catch (Exception e) { 
      Log.e("Buffer Error", "Error: " + e.toString()); 
     } 

     return response; 

    } 

} 

и

public class State { 

    private int id; 
    private String name; 

    public State(){} 

    public State(int id, String name){ 
     this.id = id; 
     this.name = name; 
    } 

    public void setId(int id){ 
     this.id = id; 
    } 

    public void setName(String name){ 
     this.name = name; 
    } 

    public int getId(){ 
     return this.id; 
    } 

    public String getName(){ 
     return this.name; 
    } 
} 

Пожалуйста, помогите

Answer 1

Эй после получения правильного ответа попробуйте добавить этот код

для например я пытаюсь жёстко прописанные values.replace это с вашей JSON.

final List<String> yourlist=new ArrayList<String>(); 
    yourlist.add("Item 1"); 
    yourlist.add("Item 2"); 
    yourlist.add("Item 3"); 
    yourlist.add("Item 4"); 
    yourlist.add("Item 5"); 
final Spinner sp1= (Spinner) findViewById(R.id.spinner1); 
final Spinner sp2= (Spinner) findViewById(R.id.spinner2); 

ArrayAdapter<String> adp1=new ArrayAdapter<String>(this, 
        android.R.layout.simple_list_item_1,yourlist); 
    adp1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    sp1.setAdapter(adp1); 

Надеется, что это помогает. :)

Answer 2

Измените свой метод как этого

private void populateSpinner(List<String> categoriesList) { 
    List<String> lables = new ArrayList<String>(); 


for (int i = 0; i < categoriesList.size(); i++) { 
    lables.add(categoriesList.get(i).getName()); 
} 

// Creating adapter for spinner 
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getContext(), 
     android.R.layout.simple_spinner_item, lables); 

// Drop down layout style - list view with radio button 
spinnerAdapter 
     .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

    // attaching data adapter to spinner 
    sp_state.setAdapter(spinnerAdapter); 
} 

И после вызова этого метода notifydatasetchanged() вызова этого метода.

@Override 
protected void onPostExecute(Void result) { 
    super.onPostExecute(result); 
    if (pDialog.isShowing()) 
     pDialog.dismiss(); 
    populateSpinner(categoriesList); 
} 

Надеется, что это поможет вам