![](/img/trans.png)
[英]adapter.notifyDataSetChanged() is not working in recyclerview in android
[英]Android RecyclerView Adapter notifyDataSetChanged not working
我已经阅读了有关stackoverflow的几个问题,以解决此问题和不完善的解决方案,但仍然无法更新项目。 通过按菜单图标,将调用searchString()。 在此方法内,我想更新recyclerview项目,但无效。 这是我的代码的相关部分:
/* in my notation, pg is equivalent to page.*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_ebook_list, container, false);
mEbookRecyclerView = (RecyclerView) view.findViewById(R.id.ebook_recycler_view);
mLayoutManager = new LinearLayoutManager(getActivity());
mEbookRecyclerView.setLayoutManager(mLayoutManager);
updateUI();
return view;
}
@Override
public void onResume() {
super.onResume();
updateUI();
}
private void updateUI() {
if (mAdapter == null) {
EbookLab ebookLab = EbookLab.get(getActivity());
List<String> pgs = ebookLab.getPgs();
mAdapter = new EbookAdapter(pgs);
mEbookRecyclerView.setAdapter(mAdapter);
}
}
/* ******codes for preparation of menus which I have ignored *******/
private class EbookHolder extends RecyclerView.ViewHolder {
private String mPg;
public EbookHolder(LayoutInflater inflater, ViewGroup container) {
super(inflater.inflate(R.layout.list_item_ebook, container, false));
mListWebView = (WebView) itemView.findViewById(R.id.list_web_View);
mListWebView.getSettings().setLoadWithOverviewMode(true);
}
public void bindEbook(String pg) {
mPg = pg;
mListWebView.loadDataWithBaseURL("file:///android_asset/", mPg, "text/html", "UTF-8", null);
}
}
private class EbookAdapter extends RecyclerView.Adapter<EbookHolder> {
private List<String> mPgs;
public EbookAdapter(List<String> pgs) {
mPgs = pgs;
}
@Override
public EbookHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
return new EbookHolder(layoutInflater, parent);
}
@Override
public void onBindViewHolder(EbookHolder holder, int position) {
String pg = mPgs.get(position);
holder.bindEbook(pg);
}
@Override
public int getItemCount() {
return mPgs.size();
}
public void setPgs(List<String> pgs) {
mPgs.clear();
mPgs.addAll(pgs);
notifyDataSetChanged();
}
}
public void searchString(String qSrh) {
EbookLab ebookLab = EbookLab.get(getActivity());
List<String> pgs = ebookLab.getPgs();
List<String> tmppgs = new ArrayList<String>(pgs);
/** Some code for manipulation of tmppgs and updating recyclerview based on the tmppgs **/
mAdapter.setPgs(tmppgs);
}
任何帮助表示赞赏。
采用
notifyItemRangeChanged(0, pgsList.size());
代替
我会尝试添加一个TextView,在您的View布局中显示mPg字符串(并绑定ViewHolder中的值),以找出问题所在。
如果出现项目字符串,则表明您的setPgs正确更新了RecyclerView,并且问题出在WebView loadDataWithBaseURL部分。
尝试直接更新pgsList,然后调用notifyDataSetChanged
在searchString
函数中,删除mAdapter.setPgs(tmppgs);
并直接更新mAdapter,如下所示,
public void searchString(String qSrh) {
EbookLab ebookLab = EbookLab.get(getActivity());
List<String> pgs = ebookLab.getPgs();
List<String> tmppgs = new ArrayList<String>(pgs);
// mAdapter.setPgs(tmppgs);
pgsList.clear();
pgsList.addAll(tmppgs);
mAdapter.notifyDataSetChanged();
}
并更新updateUI()
函数
List<String> pgsList = new ArrayList<String>();
private void updateUI() {
if (mAdapter == null) {
EbookLab ebookLab = EbookLab.get(getActivity());
pgsList = ebookLab.getPgs();
mAdapter = new EbookAdapter(pgsList);
mEbookRecyclerView.setAdapter(mAdapter);
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.