ListView onRestoreInstanceState

Question

我有一个ListView (VL)和HListView (HL)作为项目(书架风格)。我正在保存VL状态，它正在工作，但现在我想要的是保存它的items状态，因为我希望HLs在它们再次呈现时恢复它们的状态。

所以我在我的BookShelfBaseAdapter里做了这样的事情

private List<Book> bookList;
private Parcelable[] bookListStates;

@Override
public View getView(int position, View view, ViewGroup parent) {
    final int fPosition = position;
    ...

    holder.booksHListView.setOnScrollListener(new ContentListOnScrollListener(holder) {
       @Override
       public void onScrollStateChanged(AbsHListView view, int scrollState) {}

       @Override
       public void onScroll(AbsHListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
           bookListStates[fPosition] = holder.booksHListView.onSaveInstanceState();
       }
    });

    if (bookListStates[fPosition] != null) {
        holder.booksHListView.onRestoreInstanceState(bookListStates[fPosition]);
    }
    ...
}

当列表项再次呈现时，它们不再处于以前的状态.我在这里做错了什么？

耽误您时间，实在对不起。

Answer 1

我发现了问题，我必须用“还原代码”切换“保存代码”，如下所示：

@Override
public View getView(int position, View view, ViewGroup parent) {
final int fPosition = position;
...

if (bookListStates[fPosition] != null) {
    holder.booksHListView.onRestoreInstanceState(bookListStates[fPosition]);
}

holder.booksHListView.setOnScrollListener(new ContentListOnScrollListener(holder) {
   @Override
   public void onScrollStateChanged(AbsHListView view, int scrollState) {}

   @Override
   public void onScroll(AbsHListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
       bookListStates[fPosition] = holder.booksHListView.onSaveInstanceState();
   }
});   
...

}

它现在起作用了:)

Answer 2

if (bookListStates[fPosition] != null) {
    holder.booksHListView.onRestoreInstanceState(bookListStates[fPosition]);
}

holder.booksHListView.setOnScrollListener(new ContentListOnScrollListener(holder) {
   @Override
   public void onScrollStateChanged(AbsHListView view, int scrollState) {}

   @Override
   public void onScroll(AbsHListView view, int firstVisibleItem, int visibleItemCount, int      totalItemCount) {
       bookListStates[fPosition] = holder.booksHListView.onSaveInstanceState();
   }