ListView onRestoreInstanceState

Question

我有一个ListView（VL），其中HListView（HL）作为项目（书架样式）。 我正在保存VL状态并且它正在工作，但是现在我要保存的是项目状态，因为我希望HL在再次渲染时恢复其状态。
所以我在BookShelfBaseAdapter中做这样的事情：

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，它们不处于以前的状态...我在这里做错了什么？
谢谢你的时间。

Answer 1

我发现了问题，我必须将“保存代码”与“恢复代码”进行切换，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();
   }
});   
...

}

现在正在工作:)

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();
   }