android - 在 searchView 中找不到新添加的股票

Question

所以这不是我得到的错误或任何东西。这是一个我很难做到的实现。

我制作了一个股票应用程序，您可以在其中从 API 搜索股票并将它们添加到 recyclerView。我还实现了一个 searchView 来查找我的 recyclerView 列表中的任何特定库存。

但是，这是我的问题：假设我打开了应用程序并从 API 向列表中添加了一个新股票。它将股票完美地添加到列表中。但是，当我去 searchView 查找我刚刚添加的相同股票时，我在 searchView 列表中找不到它。事实上，某些股票也从 recyclerView 列表中删除（在我进入 searchView 之前它完全存在）。当我重新启动应用程序时，库存再次出现在 recyclerView 列表中，这一次我可以从 searchView 列表中访问它。这只是正在发生的一件奇怪的事情。

仅当我尝试查找刚刚添加到列表中的股票并想立即在 searchView 中找到它时，才会出现此问题。如果我关闭应用程序并重新打开，那是 searchView 知道股票存在的时候。否则，它似乎不知道何时添加新库存。

请帮忙！

带有过滤器实现的适配器类：

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> implements Filterable {
MainActivity mainAct;
List<Stock> stocks;
List<Stock> searchAllStocks;

Adapter(MainActivity ma, List<Stock> stocks) {
    this.mainAct = ma;
    this.stocks = stocks;
    this.searchAllStocks = new ArrayList<>(stocks);
}
@Override
public Filter getFilter() {
    return stockFilter;
}
private Filter stockFilter = new Filter() {
    //runs on background thread
    @Override
    protected FilterResults performFiltering(CharSequence constraint) { //charSequence constraint is whatever is typed into search
        List<Stock> filteredList = new ArrayList<Stock>(); //list to store only filtered items

        if(constraint == null || constraint.length() == 0) { //if nothing in input field
            filteredList.addAll(searchAllStocks); //show all stocks on filteredList
        }
        else { //else get user input and convert into string to filter
            String filterPattern = constraint.toString().toLowerCase().trim();

            for(Stock item: searchAllStocks) { //for each stock item in
                if(item.getName().toLowerCase().contains(filterPattern)) { //add items that match to filteredList
                    filteredList.add(item);
                }
                if(item.getSymbol().toLowerCase().contains(filterPattern)) { //add items that match to filteredList
                    filteredList.add(item);
                }
            }
        }

        //returns FilterResults and gets passed to publishResults
        FilterResults results = new FilterResults();
        results.values = filteredList;

        return results;
    }
    //runs on UI thread
    //clears current stock list and adds results of user's search to list
    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        stocks.clear();
        stocks.addAll((List)results.values);
        notifyDataSetChanged();
    }
};

按下搜索按钮时在 MainActivity 中执行的方法：

//if search button is pressed
    if(item.getItemId() == R.id.search) {
        //set up new toolbar for searching
        searchView = (SearchView)item.getActionView();
        searchView.onActionViewExpanded(); //expands search bar
        searchView.setImeOptions(EditorInfo.IME_ACTION_DONE); //sets keyboard icon to done after user types
        searchView.setQueryHint("Search...");


        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            //does stuff after text submitted
            @Override
            public boolean onQueryTextSubmit(String query) {
                return false;
            }

            //does stuff in realtime
            @Override
            public boolean onQueryTextChange(String newText) {
                adapter.getFilter().filter(newText);
                return true;
            }
        });
    }

这就是我认为我的问题所在

从 AsyncTask 类检索信息后调用此方法

//update Stock list on screen w/ info passed from Async class AsyncStockDownloader
public void updateData(Stock stock) {
    boolean flag = false;

    //check for duplicate stocks on list
    for(int i = 0; i < stocks.size(); i++) {
        if(stocks.get(i).getSymbol().equals(stock.getSymbol())) {
            //create alertbox
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(stock.getSymbol() + " is already displayed!");
            builder.setTitle("Duplicate Stock");

            AlertDialog dialog = builder.create();
            dialog.show();
            flag = true;
        }
    }

    //if no duplicate then add to list, database, and notify adapter that we changed
    if(!flag) {
        stocks.add(stock);
        db.addStock(stock);
        adapter.notifyDataSetChanged();
        //problem is here. we need to let searchAllStocks in adapter know when stock is added
        //so that searchbar can store new stock into searchAllStocks
    }
}

如果我需要发布任何其他代码，请告诉我。这些只是我认为问题所在的片段。

提前谢谢你们！

- - - - - - - - - - - - - - - - - - - - 编辑 - - - - - -----------------------------------------

这是从 Asynctask 接收信息后调用的方法

我添加了 1 行代码来尝试解决问题：adapter.searchAllStocks.add(...) 正如评论所建议的那样

这些是结果

//update Stock list on screen w/ info passed from Async class AsyncStockDownloader
public void updateData(Stock stock) {
    boolean flag = false;

    //check for duplicate stocks on list
    for(int i = 0; i < stocks.size(); i++) {
        if(stocks.get(i).getSymbol().equals(stock.getSymbol())) {
            adapter.searchAllStocks.clear();
            //create alertbox
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(stock.getSymbol() + " is already displayed!");
            builder.setTitle("Duplicate Stock");

            AlertDialog dialog = builder.create();
            dialog.show();
            flag = true;
        }
    }

    //if no duplicate then add to list, database, and notify adapter that we changed
    if(!flag) {
        stocks.add(stock);
        adapter.searchAllStocks.add(new Stock(stock.getSymbol(), stock.getName(), stock.getLatestPrice(), stock.getChange(), stock.getChangePercent()));
        db.addStock(stock);
        adapter.notifyDataSetChanged();
        //problem is here. we need to let searchAllStocks in adapter know when stock is added
        //so that searchbar can store new stock into searchAllStocks list
    }
}

所以现在让我来看看我的应用程序是什么样的。

1. 这是我已经添加了 3 只股票的主页

2. 我点击工具栏中的搜索选项，找到一只名为“GOOG”的股票

过滤列表还显示了 2 支 GOOG 股票，这很奇怪，我希望它显示 1 支，但不知道为什么会这样。

3. 这是我清除整个搜索栏后显示的过滤列表。如您所见，每只股票都有一个重复的股票。

4. 现在，当我按返回返回主页时，我的过滤列表中的所有这些重复股票都留下了。显然我们不希望这样

5. 然而，当我刷新我的主页时，我又恢复了我美丽的单只股票。每次按下后退按钮后，我希望看到我的股票像这个页面一样显示

再次感谢任何人！

标签： androidandroid-studioandroid-recyclerviewsearchview