Android onitemselectedlistener, бросающий исключение nullpointer в фрагменте

Question

Я пробовал много способов добиться успеха onitemselectedlistener в моем представлении фрагмента, но постоянно получаю фатальное исключение java.lang.NullPointerException и всегда указывает на ту же строку в коде, который предназначен для установки onitemselectedlistener метод для счетчика.

Android Studio Выход ошибка LogCat является:

07-21 13: 55: 06,544 17277-17277/com.vaibhavtech.indoreveg Е/AndroidRuntime: неустранимый: Основной процесс: com.vaibhavtech. indoreveg, ПИД: 17277
java.lang.NullPointerException на com.vaibhavtech.indoreveg.activity.VegetablesFragment.onCreateView (VegetablesFragment.java:91) на android.support.v4.app.Fragment.performCreateView (Fragment.java: 1786) на android.support.v4.app.FragmentManagerImpl.moveToState (FragmentManager.java:953) на android.support.v4.app.FragmentManagerImpl.moveToState (FragmentManager.java:1136) на android.support.v4.app.BackStackRecord.run (BackStackRecord.java:739) на android.support.v4.app. FragmentManagerImpl.execPendingActions (FragmentManager.java:1499) на android.support.v4.app.FragmentManagerImpl $ 1.run (FragmentManager.java:456) на android.os.Handler.handleCallback (Handler.java:808) на android .os.Handler.dispatchMessage (Handler.java:103) на android.os.Looper.loop (Looper.java:193) на android.app.ActivityThread.main (ActivityThread.java:5395) на java.lang .reflect.Method.invokeNative (собственный метод) at java.lang.reflect.Method.invoke (Method.java:515) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:837) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:653) в dalvik.system.NativeStart. основной (Native Method)

класс фрагмент:

public class VegetablesFragment extends Fragment { 
// Log tag 
private static final String TAG = MainActivity.class.getSimpleName(); 
private Spinner spinnerPacking; 
// array list for spinner adapter 
private ArrayList<Packing> spinnerList; 
// Product json url 
private static final String url = "http://www.indoreveg.com/androidapi1/products.php?category=vegetable"; 
private ProgressDialog pDialog; 
private List<Products> productsList = new ArrayList<Products>(); 
private ListView listView; 
private CustomListAdapter adapter; 
public VegetablesFragment() { 
    // Required empty public constructor 
} 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
} 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    View layout = inflater.inflate(R.layout.fragment_vegetables, container, false); 
    listView = (ListView) layout.findViewById(R.id.list); 
    spinnerPacking = (Spinner) layout.findViewById(R.id.packingList); 
    spinnerList = new ArrayList<Packing>(); 
    /* spinner item select listener */ 
    spinnerPacking.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { 
     @Override 
     public void onItemSelected(AdapterView<?> arg0, View arg1, 
            int arg2, long arg3) { 
      // TODO Auto-generated method stub 
      String msupplier=spinnerPacking.getSelectedItem().toString(); 
      Log.e("Selected item : ",msupplier); 
     } 
     @Override 
     public void onNothingSelected(AdapterView<?> arg0) { 
      // TODO Auto-generated method stub 
     } 
    }); 
    adapter = new CustomListAdapter(getActivity(), productsList); 
    listView.setAdapter(adapter); 
    pDialog = new ProgressDialog(getActivity()); 
    // Showing progress dialog before making http request 
    pDialog.setMessage("Loading..."); 
    pDialog.show(); 
    populateSpinner(); 
    // Creating volley request obj 
    JsonArrayRequest productsReq = new JsonArrayRequest(url, new Response.Listener<JSONArray>() { 
     @Override 
     public void onResponse(JSONArray response) { 
      Log.d(TAG, response.toString()); 
      hidePDialog(); 
      // Parsing json 
      for (int i = 0; i < response.length(); i++) { 
       try { 
        JSONObject obj = response.getJSONObject(i); 
        Products products = new Products(); 
        products.setTitle(obj.getString("name")); 
        products.setThumbnailUrl(obj.getString("image")); 
        products.setOurPrice(obj.getString("our_price")); 
        products.setMarketPrice(obj.getString("market_price")); 
        // Packing is json array 
        JSONArray packingArry = obj.getJSONArray("packing"); 
        ArrayList<String> packings = new ArrayList<String>(); 
        for (int j = 0; j < packingArry.length(); j++) { 
         packings.add((String) packingArry.get(j)); 
        } 
        products.setPacking(packings); 
        // adding products to products array 
        productsList.add(products); 
        JSONArray mpackingArray = obj.getJSONArray("packing"); 
        for (int m = 0; m < mpackingArray.length(); m++) { 
        JSONObject packObj = (JSONObject) mpackingArray.get(m); 
        Packing pack = new Packing(packObj.getString("pack")); 
         spinnerList.add(pack); 
        } 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 

      } 
      // notifying list adapter about data changes 
      // so that it renders the list view with updated data 
      adapter.notifyDataSetChanged(); 
     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d(TAG, "Error: " + error.getMessage()); 
      hidePDialog(); 
     } 
    }); 
    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(productsReq); 
    return layout; 
} 
@Override 
public void onDestroy() { 
    super.onDestroy(); 
    hidePDialog(); 
} 

private void hidePDialog() { 
    if (pDialog != null) { 
     pDialog.dismiss(); 
     pDialog = null; 
    } 
} 
private void populateSpinner() { 
    List<String> lables = new ArrayList<String>(); 

    for (int i = 0; i < spinnerList.size(); i++) { 
     lables.add(spinnerList.get(i).getPackingnm()); 
    } 
    // Creating adapter for spinner 
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(getActivity().getBaseContext(), 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 
spinnerPacking.setAdapter(spinnerAdapter); 
} 
} 

Пожалуйста, помогите. благодаря

fragment_vegetable.xml

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     xmlns:tools="http://schemas.android.com/tools" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     tools:context=".MainActivity" > 
    <ListView 
     android:id="@+id/list" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:divider="@color/list_divider" 
     android:dividerHeight="1dp" 
     android:listSelector="@drawable/list_row_selector" /> 
    </RelativeLayout> 

Адаптер GetView Метод:

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
if (inflater == null) 
inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
if (convertView == null) convertView = inflater.inflate(R.layout.list_row, null); 
TextView title = (TextView) convertView.findViewById(R.id.title); 
if (imageLoader == null) 
    imageLoader = AppController.getInstance().getImageLoader(); 
    NetworkImageView thumbNail = (NetworkImageView) convertView.findViewById(R.id.thumbnail); 
    TextView ourPrice = (TextView) convertView.findViewById(R.id.ourPrice); 
    TextView packing = (TextView) convertView.findViewById(R.id.packing); 
    TextView marketPrice = (TextView) convertView.findViewById(R.id.marketPrice); 
    Spinner packingSpinner = (Spinner) convertView.findViewById(R.id.packingList); 
    packingSpinner.setOnItemSelectedListener(this); 
    // getting products data for the row 
    Products p = productsItems.get(position); 
    // thumbnail image 
    thumbNail.setImageUrl(p.getThumbnailUrl(), imageLoader); 
    // title 
    title.setText(p.getTitle()); 
    // ourPrice 
    ourPrice.setText("Our Price: " + String.valueOf(p.getOurPrice())); 
    // packing 
    List<String> lables = new ArrayList<String>(); 
    for (int i = 0; i < p.getPacking().size(); i++) { 
     lables.add(p.getPacking().get(i)); 
    } 
    // Creating adapter for spinner 
    ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(context,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 
    packingSpinner.setAdapter(spinnerAdapter); 
    String packingStr = ""; 
    for (String str : p.getPacking()) { 
     packingStr += str + ", "; 
    } 
    packingStr = packingStr.length() > 0 ? packingStr.substring(0, 
      packingStr.length() - 2) : packingStr; 
    packing.setText(packingStr); 
    // marketPrice 
    marketPrice.setText("Market Price: " + String.valueOf(p.getMarketPrice())); 
    marketPrice.setPaintFlags(marketPrice.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG); 
    return convertView; 
} 

Answer 1

Убедитесь, что макет "fragment_vegetables" содержит Spinner с идентификатором "R.id.packingList", в противном случае возвращается layout.findViewById(R.id.packingList) null, и вы получите NullPointerException в строке spinnerPacking.setOnItemSelectedListener.