空指針異常列表視圖適配器使用視圖架時

我想實現我getView觀點持有者（）方法，但是，它墜毀並顯示在視圖持有人所有這些觀點是空的，爲什麼，這裏是我的代碼。空指針異常列表視圖適配器使用視圖架時

 if(view==null){ 
      viewHolder=new ViewHolder(); 
      view=inflater.inflate(R.layout.find_new_thing_item,null); 
      viewHolder.progressBar=(ProgressBar)view.findViewById(R.id.find_new_thing_item_progress_bar); 
      viewHolder.mainPictureImageView=(ImageView)view.findViewById(R.id.find_new_thing_item_main_image); 
      viewHolder.userIconImageView=(ImageView)view.findViewById(R.id.find_new_thing_item_user_icon); 
      viewHolder.thingsNameTextView=(TextView)view.findViewById(R.id.find_new_thing_item_name); 
      viewHolder.priceTextView=(TextView)view.findViewById(R.id.find_new_thing_item_price); 
      viewHolder.userNameTextView=(TextView)view.findViewById(R.id.find_new_thing_item_user_name); 
      viewHolder.userCommentTextView=(TextView)view.findViewById(R.id.find_new_thing_item_user_comment); 
      viewHolder. numberOfLikesTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_likes); 
      viewHolder.numberOfAddToDouListTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_add_to_dou_list); 
      viewHolder.numberOfReplyTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_reply); 
      view.setTag(viewHolder); 
     }else { 
      viewHolder=(ViewHolder)view.getTag(); 
     } 


     new DownloadItemImage().execute(thingsItemArrayList.get(i-1).getMainPicture()); 
     new DownloadUserIcon().execute(thingsItemArrayList.get(i-1).getUserIcon()); 
     viewHolder.thingsNameTextView.setText(thingsItemArrayList.get(i - 1).getThingsName()); 
     viewHolder.priceTextView.setText(thingsItemArrayList.get(i-1).getPrice()); 
     viewHolder.userNameTextView.setText(thingsItemArrayList.get(i-1).getUserName()); 
     viewHolder.userCommentTextView.setText(thingsItemArrayList.get(i-1).getUserComment()); 
     viewHolder.numberOfLikesTextView.setText(thingsItemArrayList.get(i-1).getNumberOfLikes()); 
     viewHolder.numberOfAddToDouListTextView.setText(thingsItemArrayList.get(i-1).getNumberOfAddToDouList()); 
     if(thingsItemArrayList.get(i-1).getNumberOfReply().indexOf("評論")>=0){ 
      viewHolder.numberOfReplyTextView.setText(thingsItemArrayList.get(i-1).getNumberOfReply()); 
     }else{ 
      viewHolder.numberOfReplyTextView.setText("評論 0"); 
     } 

     return view;

來源

2014-11-25 Vincent

請出示你r異常消息，所以我們可以幫助你。至少，它有一條線，你可以從它開始。 – joao2fast4u 2014-11-25 01:34:28

郵政錯誤的logcat – 2014-11-25 05:20:31

在你inflater.inflater()，你沒有指定父視圖

這樣做：

在viewHolder構造：

public viewHolder(View view){ 
    viewHolder.progressBar=(ProgressBar)view.findViewById(R.id.find_new_thing_item_progress_bar); 
     viewHolder.mainPictureImageView=(ImageView)view.findViewById(R.id.find_new_thing_item_main_image); 
     viewHolder.userIconImageView=(ImageView)view.findViewById(R.id.find_new_thing_item_user_icon); 
     viewHolder.thingsNameTextView=(TextView)view.findViewById(R.id.find_new_thing_item_name); 
     viewHolder.priceTextView=(TextView)view.findViewById(R.id.find_new_thing_item_price); 
     viewHolder.userNameTextView=(TextView)view.findViewById(R.id.find_new_thing_item_user_name); 
     viewHolder.userCommentTextView=(TextView)view.findViewById(R.id.find_new_thing_item_user_comment); 
     viewHolder. numberOfLikesTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_likes); 
     viewHolder.numberOfAddToDouListTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_add_to_dou_list); 
     viewHolder.numberOfReplyTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_reply); 
}

來源

2014-11-25 04:49:50 j4rey89

viewHolder=new ViewHolder(); 
if(view == null){ 
... 
}

像這樣做。如果你這樣做，當查看！= NULL，viewHolder等於null明顯。

來源

2014-11-25 01:42:38 paperhs

嘗試這樣....

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

      View view= convertView; 
      ViewHolder viewHolder; 

      if(convertView==null){ 

      view=inflater.inflate(R.layout.find_new_thing_item,null); 

      viewHolder=new ViewHolder(); 

      viewHolder.progressBar=(ProgressBar)view.findViewById(R.id.find_new_thing_item_progress_bar); 
      viewHolder.mainPictureImageView=(ImageView)view.findViewById(R.id.find_new_thing_item_main_image); 
      viewHolder.userIconImageView=(ImageView)view.findViewById(R.id.find_new_thing_item_user_icon); 
      viewHolder.thingsNameTextView=(TextView)view.findViewById(R.id.find_new_thing_item_name); 
      viewHolder.priceTextView=(TextView)view.findViewById(R.id.find_new_thing_item_price); 
      viewHolder.userNameTextView=(TextView)view.findViewById(R.id.find_new_thing_item_user_name); 
      viewHolder.userCommentTextView=(TextView)view.findViewById(R.id.find_new_thing_item_user_comment); 
      viewHolder. numberOfLikesTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_likes); 
      viewHolder.numberOfAddToDouListTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_add_to_dou_list); 
      viewHolder.numberOfReplyTextView=(TextView)view.findViewById(R.id.find_new_thing_item_number_of_reply); 
      view.setTag(viewHolder); 
     }else { 
      viewHolder=(ViewHolder)view.getTag(); 
     } 

     ........ 
     .......... 

return view; 
}

來源

2014-11-25 05:35:36 iMDroid

空指針異常列表視圖適配器使用視圖架時

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