Android RecyclerView適配器notifyDataSetChanged無法正常工作

Question

我已經閱讀了有關stackoverflow的幾個問題，以解決此問題和不完善的解決方案，但仍然無法更新項目。 通過按菜單圖標，將調用searchString（）。 在此方法內，我想更新recyclerview項目，但無效。 這是我的代碼的相關部分：

    /* 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);
   }

任何幫助表示贊賞。

Answer 1

采用

notifyItemRangeChanged(0, pgsList.size());

代替

Answer 2

我會嘗試添加一個TextView，在您的View布局中顯示mPg字符串（並綁定ViewHolder中的值），以找出問題所在。

如果出現項目字符串，則表明您的setPgs正確更新了RecyclerView，並且問題出在WebView loadDataWithBaseURL部分。

Answer 3

嘗試直接更新pgsList，然后調用notifyDataSetChanged

在searchString函數中，刪除mAdapter.setPgs(tmppgs);

並直接更新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();
    }

並更新updateUI()函數

       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);
    }
}