在CursorAdapter的改变光标无法正常更新列表项的看法 [英] Changing cursor in CursorAdapter is not properly updating list item views

问题描述

这问题很相似，在计算器上很多其他的问题，但我认为它值得自己的职位，由于相比，这里的其他问题的方法是不同的。

This question is very similar to many other questions on StackOverflow, but I think it merits its own post due to a difference in approach compared to other questions here.

我有扩展的CursorAdapter 自定义适配器。我更新的数据，并以刷新光标呼吁有NotifyChange 上相应的URI。在调试时，我可以看到，这是正常工作。

I have a custom adapter that extends CursorAdapter. I'm updating the data and calling notifyChange on the appropriate URI in order to refresh the cursor. In debugging, I can see that this is working properly.

不幸的是，我的列表视图不被创建。我需要他们重新创建的原因是因为我在适配器 NewView的实施

Unfortunately, my list views are not being recreated. The reason that I need them to be recreated is because of my newView implementation on the adapter:

public View newView(final Context context, final Ingredient ingredient, final ViewGroup parent) {
    final int layout = ingredient.isOwned() ? LAYOUT_OWNED : LAYOUT_UNOWNED;
    final View view = LayoutInflater.from(context).inflate(layout, null);

    // ... ViewHolder magic

    return view;
}

问题是，调用有NotifyChange 正在更新列表数据，但不是重新创建，我通过 NewView的。

The problem is that calling notifyChange is updating the list data, but it is not recreating the view that I need via newView.

下面是一些其他的事情我试过，同样没有工作：

Here are some other things I tried that equally did not work:

• 名为 adapter.notifyDataSetChanged（）中的数据被更新了。


• 名为 contentResolver.notifyChange（...）然后按 adapter.notifyDataSetChanged（）中的数据被更新后


• 名为 adapter.changeCursor（newCursor）然后按 adapter.notifyDataSetChanged（）。


• 名为 view.invalidate（）上改变了特定的列表项。

• called adapter.notifyDataSetChanged() after the data was updated.
• called contentResolver.notifyChange(...) followed by adapter.notifyDataSetChanged() after the data was updated.
• called adapter.changeCursor(newCursor) followed by adapter.notifyDataSetChanged().
• called view.invalidate() on the specific list item that changed.

这是如何处理这个任何其他建议？

Any other suggestions on how to approach this?

修改：我可能总共才服用错误的做法。我误解的适配器内欣赏到回收利用，而且我看到，回收时正在使用的错误类型的视图。因此，我可能需要去了解如何使用另一种方法造型我的看法。我是以这种方式摆在首位的原因是由于我的愿望，使用样式，不能被编程设置以外充气视图作为的这个计算器问题解释。我愿意将采取这个答案的优势，同时适当地回收列表项意见的做法。

Edit: I may altogether just be taking the wrong approach. I misunderstood the recycling of views within adapters, and I see that the wrong type of view is being used when recycled. As such, I'll probably need to go about styling my views using another approach. The reason I was taking this approach in the first place is due to my desire to use styles, which can't be set programmatically other than inflating a view as explained in this StackOverflow question. I'm open to approaches that will take advantage of that answer while properly recycling list item views.

推荐答案

我结束了基于这个StackOverflow的答案找出问题。我需要重写 getItemTypeCount 和 getItemViewType 我的适配器。

I ended up figuring out the problem based upon this StackOverflow answer. I needed to override getItemTypeCount and getItemViewType on my adapter.

@Override
public int getItemViewType(int position) {
    return getItem(position).isOwned() ? 1 : 0;
}

@Override
public int getViewTypeCount() {
    return 2;
}

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