如何在android中刷新recyclerview？答案

【问题标题】：How do I refresh a recyclerview in android?如何在android中刷新recyclerview？
【发布时间】：2017-05-10 13:00:59
【问题描述】：

我正在使用 Activity 的新数据填充回收站视图结果。问题是新数据在末尾追加回收站视图如何清除回收站视图中的先前数据并使用新数据扩充回收站视图。

@Override
protected void onActivityResult(int requestCode, int resultCode, final Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    mAdapter.notifyDataSetChanged();
    search_info.clear();
    book_type.clear();


    if (requestCode == 1) {
        if (resultCode == RESULT_OK) {


            getBookData(data);


            if (books_list.size() > 0) {

                books_list.clear();
                mAdapter.swap(prepareData());
                mAdapter.notifyDataSetChanged();

            }
            updateBooks(recyclerView);
            mAdapter.notifyDataSetChanged();


        }
    }
}

这是 getBookData 的代码。

private void getBookData(Intent data) {
    String singles = data.getStringExtra("singles");
    String status_5in1series = data.getStringExtra("status_5in1series");
    String special_issues = data.getStringExtra("special_issues");
    String special_collection = data.getStringExtra("special_collection");
    String status_3in1series = data.getStringExtra("status_3in1series");
    String status_2in1 = data.getStringExtra("status_2in1");
    String special_packs = data.getStringExtra("special_packs");
    String junior = data.getStringExtra("junior");
    String character_collections = data.getStringExtra("character_collections");
    String single_digest = data.getStringExtra("single_digest");
    String double_digest = data.getStringExtra("double_digest");
    String toddler = data.getStringExtra("toddler");
    String tinkle_treasure = data.getStringExtra("tinkle_treasure");
    String ack = data.getStringExtra("ack");
    String tinkle = data.getStringExtra("tinkle");

    search_info.add(singles);
    search_info.add(status_5in1series);
    search_info.add(special_issues);
    search_info.add(special_collection);
    search_info.add(status_3in1series);
    search_info.add(status_2in1);
    search_info.add(special_packs);
    search_info.add(junior);
    search_info.add(character_collections);
    search_info.add(single_digest);
    search_info.add(double_digest);
    search_info.add(toddler);
    search_info.add(tinkle_treasure);
    search_info.removeAll(Collections.singleton(null));

    book_type.add(ack);
    book_type.add(tinkle);
    book_type.removeAll(Collections.singleton(null));


    String search_array[] = (String[]) search_info.toArray(new String[search_info.size()]);
    String books_array[] = (String[]) book_type.toArray(new String[book_type.size()]);


    String books_info = dbHandler.searchForBooks(search_array, books_array).toString();
    ParseLocBooks parseLocBooks = new ParseLocBooks(books_info);
    parseLocBooks.parseJSON();

    title = ParseLocBooks.title;
    price = ParseLocBooks.price;
    vol_no = ParseLocBooks.vol_no;
    status = ParseLocBooks.status;
    ISBN = ParseLocBooks.ISBN;
    book_id = ParseLocBooks.book_id;
    brand = ParseLocBooks.brand;
    book_code = ParseLocBooks.book_code;
    sku = ParseLocBooks.sku;
    lang = ParseLocBooks.lang;



}

这是我的 prepareData 代码。

 private ArrayList prepareData() {

for (int i = 0; i < book_id.length; i++) {
    BooksInfo booksInfo = new BooksInfo();
    booksInfo.setTitle(title[i]);
    booksInfo.setPrice(price[i]);
    booksInfo.setVol_no(vol_no[i]);
    booksInfo.setStatus(status[i]);
    booksInfo.setISBN(ISBN[i]);
    booksInfo.setBook_id(book_id[i]);
    booksInfo.setBrand(brand[i]);
    booksInfo.setBook_code(book_code[i]);
    booksInfo.setSku(sku[i]);
    booksInfo.setLang(lang[i]);
    books_list.add(booksInfo);

}


return books_list;

}

这是我的 DataAdapter 代码。

public class DataAdapter extends RecyclerView.Adapter<DataAdapter.ViewHolder>  {
    private ArrayList<BooksInfo> books;
    private Context ctx;
    private String qty;

    private RecyclerView recyclerView;
    public DataAdapter()
    {

    }
    @NonNull
    public OnItemCheckListener onItemCheckListener;

    public DataAdapter(Context context, ArrayList<BooksInfo> books, RecyclerView recyclerView,String qty, OnItemCheckListener onItemCheckListener) {
        this.books = books;
        this.ctx = context;
        this.qty = qty;
        this.onItemCheckListener =onItemCheckListener;
        this.recyclerView = recyclerView;

    }

   public interface OnItemCheckListener {
        void onItemCheck(BooksInfo item,ViewHolder viewHolder);
        void onItemUncheck(BooksInfo item,ViewHolder viewHolder);
    }

    public void swap(ArrayList<BooksInfo> datas){
        datas = new ArrayList<>();
        recyclerView.removeAllViews();
        books.clear();
        books.addAll(datas);
        notifyDataSetChanged();

    }

    @Override
    public DataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.card_row, viewGroup, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(final DataAdapter.ViewHolder viewHolder, int i) {



        final BooksInfo booksInfo = (BooksInfo) books.get(i);

        viewHolder.tv_title.setText(booksInfo.getTitle());
        viewHolder.tv_price.setText(booksInfo.getPrice());
        viewHolder.tv_vol_no.setText(booksInfo.getVol_no());
        viewHolder.tv_status.setText(booksInfo.getStatus());
        viewHolder.tv_isbn.setText(booksInfo.getISBN());
        viewHolder.tv_book_id.setText(booksInfo.getBook_id());
        viewHolder.tv_brand.setText(booksInfo.getBrand());
        viewHolder.tv_sku.setText(booksInfo.getSku());

        viewHolder.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                viewHolder.cb_selection.setChecked(!(viewHolder.cb_selection.isChecked()));
                if (viewHolder.cb_selection.isChecked()){
                    onItemCheckListener.onItemCheck(booksInfo,viewHolder);
//                    viewHolder.tv_qty.setText(qty);
                }else{
                    onItemCheckListener.onItemUncheck(booksInfo,viewHolder);
//                    viewHolder.tv_qty.setText("0");
                }

            }
        });


    }

    public void updateNotes(ArrayList notesList) {
        books = notesList;
    }


    public void updateQty(String q)
    {
        qty =q;

    }

    @Override
    public int getItemCount() {
        return books.size();
    }




    public class ViewHolder extends RecyclerView.ViewHolder{
        public TextView tv_title,tv_price,tv_vol_no,tv_status,tv_isbn,tv_book_id,tv_brand,tv_sku,tv_qty;
        public CheckBox cb_selection;
        View itemView;
        public ViewHolder(View itemView) {
            super(itemView);
            this.itemView = itemView;

            tv_title = (TextView)itemView.findViewById(R.id.tv_title);
            tv_price = (TextView) itemView.findViewById(R.id.tv_price);
            tv_vol_no = (TextView) itemView.findViewById(R.id.tv_volno);
            tv_status = (TextView) itemView.findViewById(R.id.tv_status);
            tv_isbn = (TextView) itemView.findViewById(R.id.tv_isbn);
            tv_book_id = (TextView) itemView.findViewById(R.id.tv_bookid);
            tv_brand = (TextView) itemView.findViewById(R.id.tv_brand);
            cb_selection = (CheckBox) itemView.findViewById(R.id.cb_selection);
            cb_selection.setClickable(false);
            tv_sku = (TextView) itemView.findViewById(R.id.tv_sku);
            tv_qty = (TextView) itemView.findViewById(R.id.tv_qty);
        }

        public void setOnClickListener(View.OnClickListener onClickListener) {
            itemView.setOnClickListener(onClickListener);
        }
    }

}

感谢任何帮助或建议。谢谢。

【问题讨论】：

您在哪里创建了您的 books_list 对象？
@Sandeepdhiman 请检查我帖子末尾的 prepareData 方法。谢谢。

标签： java android android-recyclerview android-arrayadapter

【解决方案1】：

通知您的适配器以反映更改

mAdapter.notifyDataSetChanged();

【讨论】：

【解决方案2】：

在将对象添加到之前清除您的数组列表：

private ArrayList prepareData() {
                books_list.clear();
                for (int i = 0; i < book_id.length; i++) {
                    BooksInfo booksInfo = new BooksInfo();
                    booksInfo.setTitle(title[i]);
                    booksInfo.setPrice(price[i]);
                    booksInfo.setVol_no(vol_no[i]);
                    booksInfo.setStatus(status[i]);
                    booksInfo.setISBN(ISBN[i]);
                    booksInfo.setBook_id(book_id[i]);
                    booksInfo.setBrand(brand[i]);
                    booksInfo.setBook_code(book_code[i]);
                    booksInfo.setSku(sku[i]);
                    booksInfo.setLang(lang[i]);
                    books_list.add(booksInfo);            
                }                      
                return books_list;
            }

【讨论】：

谢谢@vivekmahajan 我试过了，但它对我不起作用。

【解决方案3】：

调用这个方法

removeAllViews() 在你的回收站上设置一个新的适配器。

【讨论】：

【解决方案4】：

只需清理适配器的数据，向其中添加新数据，然后在适配器上调用 notifyDataSetChanged()：

yourDataList.clear();
yourDataList.addNewObjects();
adapter.notifyDataSetChanged();

【讨论】：

嗨 bigO 我厌倦了用这个方法做这个 public void swap(ArrayList datas){ datas = new ArrayList(); book.clear();书籍.addAll（数据）； notifyDataSetChanged(); } 但它对我不起作用。
@anup 您可以编辑您的问题并将您的完整代码发布到您尝试使用 notifyDataSetChanged() 的位置吗？让我看看可能出了什么问题。