ListView控件addHeaderView导致位置增加1？ [英] ListView addHeaderView causes position to increase by one?

问题描述

下面是一个ListView一个code段。我增加了一个emptyView和headerView。加入headerView导致在onItemClick的位置被增加一。

Below is a code snippet with a ListView. I added an emptyView and a headerView. Adding the headerView causes the position in the onItemClick to be increased by one.

所以没有headerView第一列表元素将具有位置0，与headerView第一列表元素的位置将是1！

So without the headerView the first list element would have position 0, with the headerView the position of the first list element would be 1!

这会导致错误在我的适配器，例如当调用getItem（）时，用一些其他的方法，请参阅下文。 奇怪的事情：在适配器的getView（）方法的第一个列表元素与要求，即使headerView加入!!位置0

This causes errors in my adapter, e.g. when calling getItem() and using some other methods, see below. Strange thing: In the getView() method of the adapter the first list element is requested with position 0 even if the headerView is added!!

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    ListView list = (ListView) viewSwitcher.findViewById(R.id.list);
    View emptyView = viewSwitcher.findViewById(R.id.empty);
    list.setEmptyView(emptyView);

    View sectionHeading = inflater.inflate(R.layout.heading, list, false);
    TextView sectionHeadingTextView = (TextView) sectionHeading.findViewById(R.id.headingText);
    sectionHeadingTextView.setText(headerText);
    list.addHeaderView(sectionHeading);

    list.setAdapter(listAdapter);

    list.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            listAdapter.getItem(position);
            //Do something with it
        }
    });
}

有些适配器方法：

Some adapter methods:

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

@Override
public int getItemViewType(int position) {
    return (position < items.size()) ? ITEM_NORMAL : ITEM_ADVANCED;
}

    @Override
public Product getItem(int position) {
    return items.get(position);
}
@Override
public boolean areAllItemsEnabled() {
    return false;
}

@Override
public boolean isEnabled(int position) {
    return (position < items.size());
}

这增加了headerView时是正常的行为？以及如何克服这些问题在我的适配器？

Is this the normal behaviour when adding a headerView?? And how to overcome the issues in my adapter?

推荐答案

如果您添加到的ListView 即成为列表中的第一项的标题。你可以通过覆盖 getCount将（）返回一个项目少，但要确保您处理的getItem（）， getItemId（）等为标题将是位置0的项目。

If you add a header to a ListView that becomes the first item in the list. You could compensate for this by overriding the getCount() to return one item less, but ensure you handle the getItem(), getItemId() and so on as the header would be the item in position 0.

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