自定义的ListView NewView的问题

总之newView没有被要求每个列表项，是日志：自定义的ListView NewView的问题

01-06 20:04:15.957: D/NoteListActivity(2771): newView Note ID:12 
01-06 20:04:16.087: D/NoteItemView(2771): updateActionText Note ID:12 Action:Stamp 
01-06 20:04:16.117: D/NoteListActivity(2771): bindView Note ID:12 
01-06 20:04:16.329: D/NoteListActivity(2771): newView Note ID:13 
01-06 20:04:16.477: D/NoteItemView(2771): updateActionText Note ID:13 Action:Stamp 
01-06 20:04:16.497: D/NoteListActivity(2771): bindView Note ID:13 
01-06 20:04:16.729: D/NoteListActivity(2771): newView Note ID:14 
01-06 20:04:16.867: D/NoteItemView(2771): updateActionText Note ID:14 Action:Stamp 
01-06 20:04:16.887: D/NoteListActivity(2771): bindView Note ID:14 
01-06 20:04:17.107: D/NoteListActivity(2771): newView Note ID:15 
01-06 20:04:17.247: D/NoteItemView(2771): updateActionText Note ID:15 Action:Stamp 
01-06 20:04:17.269: D/NoteListActivity(2771): bindView Note ID:15 
01-06 20:04:17.487: D/NoteListActivity(2771): newView Note ID:16 
01-06 20:04:17.639: D/NoteItemView(2771): updateActionText Note ID:16 Action:Stamp 
01-06 20:04:17.657: D/NoteListActivity(2771): bindView Note ID:16 
01-06 20:04:17.897: D/NoteListActivity(2771): newView Note ID:17 
01-06 20:04:18.007: D/dalvikvm(2771): GC_EXTERNAL_ALLOC freed 99K, 47% free 2902K/5447K, external 2888K/2971K, paused 53ms 
01-06 20:04:18.127: D/NoteItemView(2771): updateActionText Note ID:17 Action:Count 
01-06 20:04:18.147: D/NoteListActivity(2771): bindView Note ID:17 
01-06 20:04:18.367: D/NoteListActivity(2771): newView Note ID:18 
01-06 20:04:18.517: D/NoteItemView(2771): updateActionText Note ID:18 Action:Stamp 
01-06 20:04:18.537: D/NoteListActivity(2771): bindView Note ID:18 
01-06 20:04:36.488: W/KeyCharacterMap(2771): No keyboard for id 0 
01-06 20:04:36.488: W/KeyCharacterMap(2771): Using default keymap: /system/usr/keychars/qwerty.kcm.bin 
01-06 20:04:38.118: D/NoteListActivity(2771): newView Note ID:19 
01-06 20:04:38.257: D/NoteItemView(2771): updateActionText Note ID:19 Action:Stamp 
01-06 20:04:38.277: D/NoteListActivity(2771): bindView Note ID:19 
01-06 20:04:38.767: D/NoteListActivity(2771): newView Note ID:20 
01-06 20:04:38.849: D/NoteItemView(2771): updateActionText Note ID:20 Action:Stamp 
01-06 20:04:38.867: D/NoteListActivity(2771): bindView Note ID:20 
01-06 20:04:39.327: D/NoteItemView(2771): updateActionText Note ID:12 Action:Stamp 
01-06 20:04:39.347: D/NoteListActivity(2771): bindView Note ID:21 
01-06 20:04:39.857: D/dalvikvm(2771): GC_EXTERNAL_ALLOC freed 84K, 47% free 2944K/5511K, external 3593K/3852K, paused 59ms 
01-06 20:04:39.997: D/NoteItemView(2771): updateActionText Note ID:13 Action:Stamp 
01-06 20:04:40.017: D/NoteListActivity(2771): bindView Note ID:22 
01-06 20:04:40.537: D/NoteItemView(2771): updateActionText Note ID:14 Action:Stamp 
01-06 20:04:40.557: D/NoteListActivity(2771): bindView Note ID:23 
01-06 20:04:41.087: D/NoteItemView(2771): updateActionText Note ID:15 Action:Stamp 
01-06 20:04:41.107: D/NoteListActivity(2771): bindView Note ID:24 
01-06 20:04:41.617: D/NoteItemView(2771): updateActionText Note ID:16 Action:Stamp 
01-06 20:04:41.639: D/NoteListActivity(2771): bindView Note ID:25 
01-06 20:06:23.858: D/NoteItemView(2771): updateActionText Note ID:18 Action:Stamp 
01-06 20:06:23.878: D/NoteListActivity(2771): bindView Note ID:18 
01-06 20:06:24.267: D/dalvikvm(2771): GC_EXTERNAL_ALLOC freed 79K, 47% free 2944K/5511K, external 4681K/4733K, paused 53ms 
01-06 20:06:26.519: D/NoteItemView(2771): updateActionText Note ID:15 Action:Stamp 
01-06 20:06:26.537: D/NoteListActivity(2771): bindView Note ID:17 
01-06 20:06:26.927: D/dalvikvm(2771): GC_EXTERNAL_ALLOC freed 17K, 47% free 2944K/5511K, external 5020K/5295K, paused 60ms 
01-06 20:06:26.987: D/NoteItemView(2771): updateActionText Note ID:12 Action:Stamp 
01-06 20:06:27.008: D/NoteListActivity(2771): bindView Note ID:16 
01-06 20:06:27.247: D/NoteItemView(2771): updateActionText Note ID:13 Action:Stamp 
01-06 20:06:27.267: D/NoteListActivity(2771): bindView Note ID:15 
01-06 20:06:27.517: D/NoteItemView(2771): updateActionText Note ID:14 Action:Stamp 
01-06 20:06:27.537: D/NoteListActivity(2771): bindView Note ID:14 
01-06 20:06:28.397: D/NoteItemView(2771): updateActionText Note ID:16 Action:Stamp 
01-06 20:06:28.417: D/NoteListActivity(2771): bindView Note ID:13 
01-06 20:06:28.809: D/NoteItemView(2771): updateActionText Note ID:19 Action:Stamp 
01-06 20:06:28.837: D/NoteListActivity(2771): bindView Note ID:12 
01-06 20:06:29.167: D/NoteItemView(2771): updateActionText Note ID:12 Action:Stamp 
01-06 20:06:29.189: D/NoteListActivity(2771): bindView Note ID:16 
01-06 20:06:29.477: D/NoteItemView(2771): updateActionText Note ID:15 Action:Stamp 
01-06 20:06:29.497: D/NoteListActivity(2771): bindView Note ID:17 
01-06 20:06:29.688: D/NoteItemView(2771): updateActionText Note ID:18 Action:Stamp 
01-06 20:06:29.707: D/NoteListActivity(2771): bindView Note ID:18 
01-06 20:06:31.807: D/NoteItemView(2771): updateActionText Note ID:20 Action:Stamp 
01-06 20:06:31.827: D/NoteListActivity(2771): bindView Note ID:19 
01-06 20:06:32.267: D/NoteItemView(2771): updateActionText Note ID:13 Action:Stamp 
01-06 20:06:32.288: D/NoteListActivity(2771): bindView Note ID:20 
01-06 20:06:32.537: D/NoteItemView(2771): updateActionText Note ID:14 Action:Stamp 
01-06 20:06:32.567: D/NoteListActivity(2771): bindView Note ID:21 
01-06 20:06:32.867: D/NoteItemView(2771): updateActionText Note ID:16 Action:Stamp 
01-06 20:06:32.887: D/NoteListActivity(2771): bindView Note ID:22 
01-06 20:06:33.127: D/NoteItemView(2771): updateActionText Note ID:19 Action:Stamp 
01-06 20:06:33.147: D/NoteListActivity(2771): bindView Note ID:23 
01-06 20:06:33.677: D/NoteItemView(2771): updateActionText Note ID:15 Action:Stamp 
01-06 20:06:33.697: D/NoteListActivity(2771): bindView Note ID:24 
01-06 20:06:34.187: D/NoteItemView(2771): updateActionText Note ID:14 Action:Stamp 
01-06 20:06:34.207: D/NoteListActivity(2771): bindView Note ID:25 
01-06 20:06:34.447: D/NoteItemView(2771): updateActionText Note ID:13 Action:Stamp 
01-06 20:06:34.467: D/NoteListActivity(2771): bindView Note ID:21 
01-06 20:06:34.647: D/NoteItemView(2771): updateActionText Note ID:20 Action:Stamp 
01-06 20:06:34.667: D/NoteListActivity(2771): bindView Note ID:20 
01-06 20:06:34.847: D/NoteItemView(2771): updateActionText Note ID:18 Action:Stamp 
01-06 20:06:34.867: D/NoteListActivity(2771): bindView Note ID:19

这里是适配器：

class NoteItemAdapter extends CursorAdapter { 

    private LayoutInflater mInflater; 

    public NoteItemAdapter(Context context, Cursor c) { 
     super(context, c); 
     mInflater = LayoutInflater.from(context); 
    } 

    public NoteItemAdapter(Context context, Cursor c, boolean autoRequery) { 
     super(context, c, autoRequery); 
     mInflater = LayoutInflater.from(context); 
    } 

    @Override 
    public void bindView(View view, Context context, Cursor cursor) { 
     final NoteListItemHolder noteItemHolder = (NoteListItemHolder)view.getTag(); 
     NoteCursor nc = (NoteCursor)cursor; 

     initView(noteItemHolder, nc); 

     Log.d(TAG, String.format("bindView Note ID:%s", nc.getColId())); 
    } 

    private void initView(final NoteListItemHolder noteItemHolder, NoteCursor nc) 
      throws NotFoundException { 
     noteItemHolder.getBase().setClickable(false); 
     noteItemHolder.getBase().setLongClickable(true); 
     noteItemHolder.getTopText().setText(nc.getColTitle()); 
     noteItemHolder.getBottomText().setText(nc.getColNote()); 
     byte[] icon = nc.getColActionIcon(); 
     if (icon != null) { 
      noteItemHolder.getIconButton().setImageBitmap(BitmapUtil.BitmapFromByteArray(icon)); 
     } else { 
      NoteAction actionType = NoteListItemHolder.NoteActionFromInt(nc.getColActionType()); 
      int actionIconResId = R.drawable.note_action_icon_none; 
      switch (actionType) { 
      case Span: 
       actionIconResId = R.drawable.note_action_icon_span; 
       break; 
      case Stamp: 
       actionIconResId = R.drawable.note_action_icon_stamp; 
       break; 
      case Count: 
       actionIconResId = R.drawable.note_action_icon_count; 
       break; 
      default: 
       //NOOP 
       break; 
      } 
      noteItemHolder.getIconButton().setImageBitmap(((BitmapDrawable)getResources().getDrawable(actionIconResId)).getBitmap()); 
     } 
     noteItemHolder.getIconButton().setClickable(true); 
     noteItemHolder.getIconButton().setLongClickable(false); 
     noteItemHolder.updateActionText(); 

     noteItemHolder.getIconButton().setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View iconView) { 
       noteItemHolder.doAction(); 
      } 
     }); 
    } 

    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup viewGroup) { 
     View row = mInflater.inflate(R.layout.note_list_item, viewGroup, false); 
     NoteCursor nc = (NoteCursor)getCursor(); 
     NoteListItemHolder wrapper = new NoteListItemHolder(row, nc.getColId()); 
     row.setTag(wrapper); 

     Log.d(TAG, String.format("newView Note ID:%s", nc.getColId())); 

     return row; 
    } 
}

我一直在读一本一堆关于类似的问题，我只是无法弄清楚！

项目的第一页（当列表视图被加载时可见）总是正确的，但是当您至少滚动列表项中的一个文本视图时总是正确的，并且至少有一个在新的项目（两个文本视图正在从始终调用的bindView获取文本更新）。这让我相信这个问题不在适配器中，但是如日志所示，newView不会被调用到项目21及更高版本。

而且......对于额外的好处，当您向后滚动时，那些正确的不再是;他们现在的行为与列表中的其他部分相似。

那么，有什么想法的家伙？

来源

2012-02-02 LostNomad311

我很想忽略你的意见，但既然你有如此高的声誉...我通常不会提出简单或直接的问题，因此，并不总是对他们的答案（或合适的人根本没有出现）。因此，我不会将部分或“非常接近”的回答标记为答案，因为这只会传播当前在整个互联网中发生狂妄的混淆。当我的问题得到充分回答时，他们会得到适当的注意（可以自行检查）。 – LostNomad311 2012-02-02 04:39:45

* *咳嗽* *接受这一个* *咳嗽* * :-P – dmon 2012-02-02 14:15:37

-1

所以@dmon指出，这些意见正在被重用（是的，我知道我应该已经得到了这个概念）。在我的持有人中，笔记ID等被存储并随后用于填充一些子视图。仅供参考我正在将这些列表项otimizing到持有者模式，并思考为什么不把文本更新在那里，因为我将数据缓存 - 然后BOOM！

现在我明白，视图并不总是显示相同的数据，我已经删除了逻辑，一切都很好！

非常感谢@dmon为解释这个概念，我没有把握（并希望这有助于其他一些无望的代码猴）！

下面是更改的行（我只是路过的说明ID的持有者现在）：

noteItemHolder.updateActionText(); 
//is now 

noteItemHolder.updateActionText(noteID);

和

noteItemHolder.doAction(); 
//is now 

noteItemHolder.doAction(noteID);

来源

2012-02-02 04:35:00 LostNomad311

这是预期的。 CursorAdapter只是为您回收视图。 newView()只会针对第一个屏幕（可能还有其他几个项目）调用，但对于所有其他视图，您在newView()中返回的视图将被回收，并且只会通过bindView()方法运行。在这些情况下，问题通常是其中一个字段未返回到“默认”状态，并且陈旧的数据通过。这就是为什么你有“不正确”的数据。我在你发布的bindView()代码中看不到任何明显的错误，但是如果我不得不猜测，我会说问题出在noteItemHolder.updateActionText()方法中。

来源

2012-02-02 03:32:14 dmon

我现在看到光线，这是我的理解，可以用同一个持有者生存和死亡。我的问题是我在持有者中持有的数据是特定于显示在视图中的行，我知道这些数据会改变。 – LostNomad311 2012-02-02 04:09:21

自定义的ListView NewView的问题

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