GridView錯誤「ClassCastException：java.lang.Integer」

我在看google 2009，並注意到我的代碼效率低下，可能會導致內存問題。GridView錯誤「ClassCastException：java.lang.Integer」

這是我實現

public View getView(final int position, View convertView, ViewGroup parent) { 
      // TODO Auto-generated method stub 
      ViewHolder viewHolder; 
      if(li == null){ 
      li = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     } 
     if(convertView == null){ 
      convertView = li.inflate(R.layout.book_case_view, parent, false); 

      viewHolder = new ViewHolder(); 
      viewHolder.image = (ImageView)convertView.findViewById(R.id.bookCover); 
      viewHolder.textView = (TextView)convertView.findViewById(R.id.bookLabel); 

      convertView.setTag(viewHolder); 
     }else{ 
      viewHolder = (ViewHolder) convertView.getTag(); 
     } 
     bi = dbh.getData(FILES.get(position)); 

     convertView.setTag(position); 
     convertView.setOnClickListener(new OnClickListener() { 

      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       BookCaseOnClick(position); 
      } 
     }); 

     viewHolder.image.setImageResource(R.drawable.book);//Create a drawable backup cover 


     viewHolder.textView.setText(bi.getBook_Title());//Object refers to Book_information 


viewHolder.textView.setBackgroundResource(R.drawable.alphabet_bar_bg_dark); 
//   new LoadCover(image, bi).run(); 
      LoadCover(viewHolder.image, bi, position); 
      return convertView; 
     } 

static class ViewHolder{ 
    ImageView image; 
    TextView textView; 
}

不過，我跑在這條線的錯誤加載第一循環之後。（第二個）

viewHolder = (ViewHolder) convertView.getTag();

這些是錯誤。記下主要的事情是，一個異常被調試

08-16 20:13:02.073: E/AndroidRuntime(6520): FATAL EXCEPTION: main 
08-16 20:13:02.073: E/AndroidRuntime(6520): java.lang.ClassCastException: java.lang.Integer 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at epub.activity.View_Book_Selection_Screen$BookCaseAdapter.getView(View_Book_Selection_Screen.java:835) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.AbsListView.obtainView(AbsListView.java:1409) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.GridView.makeAndAddView(GridView.java:1222) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.GridView.makeRow(GridView.java:268) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.GridView.fillDown(GridView.java:221) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.GridView.fillFromTop(GridView.java:340) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.GridView.layoutChildren(GridView.java:1136) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.AbsListView.onLayout(AbsListView.java:1260) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.View.layout(View.java:7175) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.View.layout(View.java:7175) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1254) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1243) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1049) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.View.layout(View.java:7175) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1254) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1130) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1047) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.View.layout(View.java:7175) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.View.layout(View.java:7175) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1254) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1130) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.LinearLayout.onLayout(LinearLayout.java:1047) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.View.layout(View.java:7175) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.View.layout(View.java:7175) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.ViewRoot.performTraversals(ViewRoot.java:1140) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1859) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.os.Handler.dispatchMessage(Handler.java:99) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.os.Looper.loop(Looper.java:123) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at java.lang.reflect.Method.invoke(Method.java:507) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
08-16 20:13:02.073: E/AndroidRuntime(6520):  at dalvik.system.NativeStart.main(Native Method)

來源

2012-08-16 Akyl

要設置一個整數作爲標籤時發現了「被java.lang.Integer中的」錯誤在GridView類傳入

convertView.setTag(position);

但你在做

viewHolder = (ViewHolder) convertView.getTag();

這就是你得到這個異常的原因。要麼將viewHolder設置爲標記，要麼將其轉換爲整數

來源

2012-08-16 20:48:57 nandeesh

但它是否持有我的類視圖？「convertView.setTag（viewHolder）;」我認爲像這樣寫它會保持我的靜態類。 – Akyl 2012-08-16 20:51:03

，但看到你正在覆蓋它的setonclicklistener之前的行 – nandeesh 2012-08-16 20:51:39

nvm。我是一個白癡。 – Akyl 2012-08-16 20:51:47

Akyl，類似的東西可能會對您有所幫助。

ViewHolder holder = null; 
if (convertView == null || !(convertView.getTag() instanceof ViewHolder)) { 
    convertView = mInflater.inflate(R.layout.your_view, null); 
    holder = new ViewHolder(your params); 
    convertView.setTag(holder); 
} else { 
    holder = (ViewHolder) convertView.getTag(); 
}

來源

2012-08-16 21:56:43

GridView錯誤「ClassCastException：java.lang.Integer」

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