Listview Crashes Когда я прокручиваю вниз

Question

У меня есть пользовательский Listview с заголовком раздела в нем. И когда пользователь нажимает поиск, список должен загружаться. Список набирает нагрузку, но когда я просматриваю список, получаю крах. Я также использовал зрителя. Но я не знал, как это исправить.

И моя основная деятельность:

private void loadVolleyData(String url) { 
    String tag_json_obj = "json_obj_req"; 

    final ProgressDialog pDialog = new ProgressDialog(this); 
    pDialog.setMessage("Loading..."); 
    pDialog.show(); 

    imageList1.clear(); 
    imageList2.clear(); 
    imageList3.clear(); 
    imageList4.clear(); 
    imageList5.clear(); 
    imageList6.clear(); 
    imageList7.clear(); 
    imageList8.clear(); 
    imageList9.clear(); 

    Log.d(TAG, "Search URL: " + url); 
    JsonObjectRequest jsonObjReq = new JsonObjectRequest(url, new Response.Listener<JSONObject>() { 
     @Override 
     public void onResponse(JSONObject response) { 
      Log.d(TAG, "Response Full: " + response); 

      try { 

       // One -------- 
       JSONArray categoryval = response.getJSONArray("allbrands"); 

       for (int j = 0; j < categoryval.length(); j++) { 
        allbrands = new HomeItem(); 
        JSONObject object1 = categoryval.getJSONObject(j); 
        if (object1.getString("Status").equalsIgnoreCase("Success")) { 
         System.out.println("array" + object1.getString("imagepath")); 
         allbrands.setID(object1.getString("brandId")); 
         allbrands.setDesc(object1.getString("brandName")); 
         allbrands.setImage(object1.getString("imagepath")); 
         allbrands.setTag("ALL BRANDS"); 
         imageList1.add(allbrands); 
        } 

       } 

       // Two --------- 
       JSONArray deals = response.getJSONArray("dealsnoffers"); 
       System.out.println("Deals n Offres Array " + deals); 

       for (int k = 0; k < deals.length(); k++) { 
        allbrands = new HomeItem(); 
        JSONObject object1 = deals.getJSONObject(k); 
        if (object1.getString("Status").equalsIgnoreCase("Success")) { 
         allbrands.setID(object1.getString("brandId")); 
         //allbrands.setName(object1.getString("brandName")); 
         allbrands.setImage(object1.getString("imagepath")); 
         allbrands.setDesc(object1.getString("desc")); 
         allbrands.setContent(object1.getString("content")); 
         allbrands.setTag("DEALS & OFFERS"); 
         imageList2.add(allbrands); 
        } 
       } 

       // Three ---------- 
       JSONArray Specials = response.getJSONArray("brandchildphotoimages"); 
       System.out.println("Brand Child Pic Images" + Specials); 

       for (int k = 0; k < Specials.length(); k++) { 
        allbrands = new HomeItem(); 
        JSONObject cuisine = Specials.getJSONObject(k); 
        if (cuisine.getString("Status").equalsIgnoreCase("Success")) { 
         allbrands.setID(cuisine.getString("brandId")); 
         //allbrands.setPhotoid(cuisine.getString("photoId")); 
         allbrands.setImage(cuisine.getString("imagepath")); 
         allbrands.setDesc(cuisine.getString("desc")); 
         allbrands.setContent(cuisine.getString("content")); 
         allbrands.setTag("MY SPECIALS"); 
         imageList3.add(allbrands); 
        } 
       } 

       savngDataInList(); 

      } catch (JSONException e) { 
       VolleyLog.e(TAG, "Response Handling: " + e); 
      } 

      pDialog.hide(); 

     } 
    }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      Log.d(TAG, "Response Error: " + error); 
      pDialog.hide(); 

     } 
    }); 

    jsonObjReq.setRetryPolicy(new DefaultRetryPolicy(
      5000, 
      DefaultRetryPolicy.DEFAULT_MAX_RETRIES, 
      DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); 

    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(jsonObjReq, tag_json_obj); 
} 

И мой адаптер GetView Метод:

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 

    final MyViewHolder viewHolder = new MyViewHolder(); 

    try { 
     final HomeItem HomeItem = HomeItemList.get(position); 
     final HomeItem HomeItem1 = HomeItemList1.get(position); 


     if (convertView == null) { 
      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.all_brands_layout_search, null); 

      viewHolder.imageOne = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view); 
      viewHolder.descOne = (TextView) convertView.findViewById(R.id.bugket_textView); 
      viewHolder.imageTwo = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view2); 
      viewHolder.descTwo = (TextView) convertView.findViewById(R.id.bugket_textView2); 

      convertView.setTag(viewHolder); 
     } 
     if (imageLoader == null) 
      imageLoader = AppController.getInstance().getImageLoader(); 


     viewHolder.descOne.setText(HomeItem.getDesc()); 
     //CatTitle.setText(HomeItem.getHomeItemDescription()); 

     System.out.println("adapterrr" + HomeItem.getDesc()); 
     imageLoader.get(HomeItem.getImage(), new ImageListener() { 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("TAG_image", "Image Load Error: " + error.getMessage()); 
      } 

      @Override 
      public void onResponse(ImageContainer response, boolean arg1) { 
       if (response.getBitmap() != null) { 

        // load image into imageview 

        viewHolder.imageOne.setImageBitmap(response.getBitmap()); 
       } 
      } 
     }); 
     System.out.println("adapterrr" + HomeItem.getImage()); 

     viewHolder.descTwo.setText(HomeItem1.getDesc()); 
     //CatTitle.setText(HomeItem.getHomeItemDescription()); 
     System.out.println("adapterrr" + HomeItem1.getDesc()); 
     imageLoader.get(HomeItem1.getImage(), new ImageListener() { 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("TAG_image", "Image Load Error: " + error.getMessage()); 
      } 

      @Override 
      public void onResponse(ImageContainer response, boolean arg1) { 
       if (response.getBitmap() != null) { 

        // load image into imageview 

        viewHolder.imageTwo.setImageBitmap(response.getBitmap()); 
       } 
      } 
     }); 
     // imageLoader.DisplayImage(HomeItem1.getImage(), CatImage1); 
     System.out.println("adapterrr" + HomeItem1.getImage()); 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
    return convertView; 
} 

И мой LogCat является

E/AndroidRuntime: FATAL EXCEPTION: main 
                   Process: com.truetech.lola, PID: 22344 
                   java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference 
                    at android.widget.AbsListView.obtainView(AbsListView.java:2363) 
                    at android.widget.ListView.makeAndAddView(ListView.java:1875) 
                    at android.widget.ListView.fillDown(ListView.java:702) 
                    at android.widget.ListView.fillGap(ListView.java:666) 
                    at android.widget.AbsListView.trackMotionScroll(AbsListView.java:5036) 
                    at android.widget.AbsListView$FlingRunnable.run(AbsListView.java:4584) 
                    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) 
                    at android.view.Choreographer.doCallbacks(Choreographer.java:670) 
                    at android.view.Choreographer.doFrame(Choreographer.java:603) 
                    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) 
                    at android.os.Handler.handleCallback(Handler.java:746) 
                    at android.os.Handler.dispatchMessage(Handler.java:95) 
                    at android.os.Looper.loop(Looper.java:148) 
                    at android.app.ActivityThread.main(ActivityThread.java:5443) 
                    at java.lang.reflect.Method.invoke(Native Method) 
                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) 
                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
03-02 12:34:39.500 22344-22375/com.truetech.lola D/Volley: [10331] BasicNetwork.logSlowRequests: HTTP response for request=<[ ] http://166.62.88.68:8080/lolaPrjct/repo/photoimages/342.jpg 0x9d2d6d5b LOW 18> [lifetime=9981], [size=1030852], [rc=200], [retryCount=1] 

И activity_main.xml является

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical"> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="50dp" 
    android:background="@color/header_grey" 
    android:orientation="horizontal" 
    android:weightSum="100"> 

    <ImageView 
     android:id="@+id/slidedrawer" 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_gravity="center" 
     android:layout_weight="20" 
     android:contentDescription="@string/showmy" 
     android:padding="12dp" 
     android:src="@drawable/actionbar_back" /> 

    <TextView 
     android:id="@+id/title_text" 
     android:layout_width="0dp" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center" 
     android:layout_marginEnd="6dp" 
     android:layout_marginStart="6dp" 
     android:layout_weight="60" 
     android:text="@string/app_name_search" 
     android:textAllCaps="true" 
     android:textColor="@color/dark_red" 
     android:textStyle="bold" /> 

    <ImageView 
     android:id="@+id/lolahomelick" 
     android:layout_width="0dp" 
     android:layout_height="38dp" 
     android:layout_gravity="center" 
     android:layout_weight="20" 
     android:padding="8dp" 
     android:src="@drawable/lola_home" /> 
</LinearLayout> 

<LinearLayout 
    android:id="@+id/layout_search" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="10dp" 
    android:layout_marginRight="10dp" 
    android:layout_marginTop="10dp" 
    android:background="@drawable/rounded_border_search" 
    android:orientation="horizontal" 
    android:weightSum="100"> 

    <EditText 
     android:id="@+id/search_edittext" 
     android:layout_width="wrap_content" 
     android:layout_height="50dp" 
     android:layout_gravity="center" 
     android:layout_weight="95" 
     android:background="@drawable/edittext_noborder" 
     android:gravity="center" 
     android:hint="Enter your search..." 
     android:maxLines="1" 
     android:textColorHint="@color/grey_grey" 
     android:textStyle="italic" /> 

    <ImageView 
     android:id="@+id/action_search" 
     android:layout_width="40dp" 
     android:layout_height="40dp" 
     android:layout_gravity="center" 
     android:layout_marginRight="2dp" 
     android:layout_weight="5" 
     android:src="@drawable/searchgry" /> 
</LinearLayout> 

<ListView 
    android:id="@+id/Listview" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_marginTop="5dp" 
    android:divider="@null" /> 
<!--<GridView 
    android:id="@+id/gridView" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_marginTop="5dp" 
    android:numColumns="2" 
    android:divider="@null" />--> 
</LinearLayout> 

И all_brands_search.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:background="@drawable/rounded_border" 
android:orientation="vertical"> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:weightSum="2" 
    android:orientation="horizontal"> 

    <LinearLayout 
     android:id="@+id/itemContainer" 
     android:layout_width="0dip" 
     android:layout_height="210dp" 
     android:layout_margin="5dp" 
     android:layout_weight="1" 
     android:orientation="vertical" 
     android:tag="1"> 

     <com.etsy.android.grid.util.DynamicHeightImageView 
      android:id="@+id/my_brand_pinrest_view" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_margin="2dp" 
      android:scaleType="centerCrop" /> 

     <TextView 
      android:id="@+id/bugket_textView" 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_gravity="center" 
      android:layout_marginBottom="5dp" 
      android:layout_marginLeft="8dp" 
      android:layout_marginRight="8dp" 
      android:layout_marginTop="5dp" 
      android:layout_weight="4" 
      android:gravity="center" 
      android:text="" 
      android:textColor="@color/red" /> 

    </LinearLayout> 

    <LinearLayout 
     android:id="@+id/itemContainer2" 
     android:layout_width="0dip" 
     android:layout_height="210dp" 
     android:layout_margin="5dp" 
     android:layout_weight="1" 
     android:orientation="vertical" 
     android:tag="2"> 

     <com.etsy.android.grid.util.DynamicHeightImageView 
      android:id="@+id/my_brand_pinrest_view2" 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_margin="2dp" 
      android:scaleType="centerCrop" />s 

     <TextView 
      android:id="@+id/bugket_textView2" 
      android:layout_width="match_parent" 
      android:layout_height="0dp" 
      android:layout_gravity="center" 
      android:layout_marginBottom="5dp" 
      android:layout_marginLeft="8dp" 
      android:layout_marginRight="8dp" 
      android:layout_marginTop="5dp" 
      android:layout_weight="4" 
      android:gravity="center" 
      android:text="" 
      android:textColor="@color/red" /> 
    </LinearLayout> 
</LinearLayout> 
</LinearLayout> 

Обновленный класс Adapter

package com.truetech.lola.search; 


public class HomeListAdapter extends ArrayAdapter<HomeItem> implements OnClickListener { 
public Context context; 
public List<HomeItem> HomeItemList, HomeItemList1; 
com.android.volley.toolbox.ImageLoader imageLoader; 

public HomeListAdapter(Context context, int resource, List<HomeItem> HomeItemLst, List<HomeItem> HomeItemLst1) { 
    super(context, resource, HomeItemLst); 
    this.context = context; 
    this.HomeItemList = HomeItemLst; 
    this.HomeItemList1 = HomeItemLst1; 
    imageLoader = AppController.getInstance().getImageLoader(); 
} 

static class ViewHolder { 
    DynamicHeightImageView imageOne, imageTwo; 
    TextView descOne, descTwo; 
} 

@Override 
public int getCount() { 
    if (HomeItemList != null) 
     return HomeItemList.size(); 
    if (HomeItemList1 != null) 
     return HomeItemList1.size(); 

    return 0; 
} 

@Override 
public HomeItem getItem(int position) { 
    if (position >= HomeItemList.size()) 
     return HomeItemList1.get(position); 
    return HomeItemList.get(position); 
} 


@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 

    View row; 
    row = convertView; 
    final ViewHolder viewHolder; 

    try { 
     /*final HomeItem homeItem = HomeItemList.get(position); 
     final HomeItem homeItem1 = HomeItemList1.get(position);*/ 

     if (convertView == null) { 

      LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.all_brands_layout_search, null); 

      viewHolder = new ViewHolder(); 

      viewHolder.imageOne = (DynamicHeightImageView) row.findViewById(R.id.my_brand_pinrest_view); 
      viewHolder.descOne = (TextView) row.findViewById(R.id.bugket_textView); 
      viewHolder.imageTwo = (DynamicHeightImageView) row.findViewById(R.id.my_brand_pinrest_view2); 
      viewHolder.descTwo = (TextView) row.findViewById(R.id.bugket_textView2); 

      convertView.setTag(viewHolder); 
     }else { 
      viewHolder = (ViewHolder) row.getTag(); 
     } 
     if (imageLoader == null) 
      imageLoader = AppController.getInstance().getImageLoader(); 



     /* final DynamicHeightImageView CatImage = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view); 
     TextView CatHeader = (TextView) convertView.findViewById(R.id.itemSubHeaderText1); 
     final DynamicHeightImageView CatImage1 = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view1); 
     TextView CatHeader1 = (TextView) convertView.findViewById(R.id.itemSubHeaderText2); 
     //TextView CatTitle = (TextView) myConvertView.findViewById(R.id.description);*/ 

     /*final DynamicHeightImageView CatImage = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view); 
     TextView CatHeader = (TextView) convertView.findViewById(R.id.bugket_textView); 
     final DynamicHeightImageView CatImage1 = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view2); 
     TextView CatHeader1 = (TextView) convertView.findViewById(R.id.bugket_textView2);*/ 

     HomeItem homeItem; 
     HomeItem homeItem1; 

     homeItem = (HomeItem) this.getItem(position); 
     homeItem1 = (HomeItem) this.getItem(position); 

     viewHolder.descOne.setText(homeItem.getDesc()); 
     //CatTitle.setText(HomeItem.getHomeItemDescription()); 

     System.out.println("adapterrr" + homeItem.getDesc()); 
     imageLoader.get(homeItem.getImage(), new ImageListener() { 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("TAG_image", "Image Load Error: " + error.getMessage()); 
       viewHolder.imageOne.setImageResource(R.drawable.lolg_placehold); 
      } 

      @Override 
      public void onResponse(ImageContainer response, boolean arg1) { 
       if (response.getBitmap() != null) { 
        // load image into imageview 
        viewHolder.imageOne.setImageBitmap(response.getBitmap()); 
       } 
      } 
     }); 
     System.out.println("adapterrr" + homeItem.getImage()); 

     viewHolder.descTwo.setText(homeItem1.getDesc()); 
     //CatTitle.setText(HomeItem.getHomeItemDescription()); 
     System.out.println("adapterrr" + homeItem1.getDesc()); 
     imageLoader.get(homeItem1.getImage(), new ImageListener() { 

      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.e("TAG_image", "Image Load Error: " + error.getMessage()); 
       viewHolder.imageTwo.setImageResource(R.drawable.lolg_placehold); 
      } 

      @Override 
      public void onResponse(ImageContainer response, boolean arg1) { 
       if (response.getBitmap() != null) { 
        // load image into imageview 
        viewHolder.imageTwo.setImageBitmap(response.getBitmap()); 
       } 
      } 
     }); 
     // imageLoader.DisplayImage(HomeItem1.getImage(), CatImage1); 
     System.out.println("adapterrr " + homeItem1.getImage()); 

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

    return row; 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

public void onClick(View v) { 
    // TODO Auto-generated method stub 

} 

} 

Answer 1

U нужно получить, что viewHolder после U установить тег, ур не делать that.Put этот код и проверить ..

MyViewHolder viewHolder = null; 

if (convertView == null) { 
     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     viewHolder = new MyViewHolder();; 
     convertView = inflater.inflate(R.layout.all_brands_layout_search, null); 

     viewHolder.imageOne = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view); 
     viewHolder.descOne = (TextView) convertView.findViewById(R.id.bugket_textView); 
     viewHolder.imageTwo = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view2); 
     viewHolder.descTwo = (TextView) convertView.findViewById(R.id.bugket_textView2); 

     convertView.setTag(viewHolder); 
    }else{ 
viewHolder= (MyViewHolder)convertView.getTag(); 
} 

Answer 2

Вы используете ViewHolder шаблон неправильный. Вам нужно сделать что-то подобное:

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 

    final MyViewHolder viewHolder; 
    final HomeItem HomeItem = HomeItemList.get(position); 
    final HomeItem HomeItem1 = HomeItemList1.get(position); 
    if (convertView == null) { 
     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.all_brands_layout_search, parent, false); 
     viewHolder = new MyViewHolder(); 
     viewHolder.imageOne = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view); 
     viewHolder.descOne = (TextView) convertView.findViewById(R.id.bugket_textView); 
     viewHolder.imageTwo = (DynamicHeightImageView) convertView.findViewById(R.id.my_brand_pinrest_view2); 
     viewHolder.descTwo = (TextView) convertView.findViewById(R.id.bugket_textView2); 
     convertView.setTag(viewHolder); 
    } else { 
     viewHolder = (MyViewHolder)convertView.getTag(); 
    } 
    ///rest of your code 
    return convertView; 
} 

Answer 3

Вы получаете все это неправильно .. Если ваша точка зрения равна нулю, то вы создаете новый ViewHolder, и если это не то вы получите ViewHolder от него.

@Override 
public View getView(final int position, View convertView, ViewGroup parent) {  

    final MyViewHolder viewHolder; 

    if (convertView == null) { 

     viewHolder = new MyViewHolder(); 

     LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.all_brands_layout_search, parent, false); 
     //find all views.. 
     //find all views.. 
     //find all views.. 
     convertView.setTag(viewHolder); 
    } else { 
     // the view holder already exist 
     viewHolder = (MyViewHolder) convertView.getTag(); 
    } 

    ... 
}